1. Species Nitella abyssinica A.Braun, 1882
2. Species Nitella acanthospora Casanova & Karol, 2023
3. Species Nitella acuminata A.Braun, 1849
4. Species Nitella aemula A.Braun, 1852
5. Species Nitella africana (A.Braun) Kützing, 1849
6. Species Nitella aggregata F.Han & W.Q.Chen, 1986
7. Species Nitella agharkarii Kundu, 1974
8. Species Nitella allenii G.O.Allen, 1954 accepted as Nitella subglomerata var. greenii (R.D.Wood) Raam, 2010 (synonym)
9. Species Nitella allenii K.Imahori, 1953
10. Species Nitella alleninda J.S.Zaneveld, 1940
11. Species Nitella anhuiensis Y.Y.Li, 1988
12. Species Nitella annamalaiensis D.Subramanian
13. Species Nitella annandalei B.P.Pal, 1932
14. Species Nitella annularis T.F.Allen, 1894
15. Species Nitella anomala J.Wallman, 1853 accepted as Nitella confervacea (Brébisson) A.Braun ex Leonhardi, 1863
16. Species Nitella antarctica A.Braun, 1849 accepted as Tolypella antarctica (A.Braun) R.Corillion, 1982
17. Species Nitella arechavaletae C.Spegazzini, 1883
18. Species Nitella arthroglochin (Nordstedt) M.T.Casanova, 2007
19. Species Nitella arvernica A.F.Hy, 1889 accepted as Nitella gracilis f. arvernica (A.F.Hy) A.F.Hy, 1913 (synonym)
20. Species Nitella asagrayana Schaffn.ex Nordstedt, 1882
21. Species Nitella atkahensis (R.D. Wood) R.D. Wood, 1965 accepted as Nitella flexilis f. atkahensis R.D.Wood, 1962 (synonym)
22. Species Nitella atrovirens J.Wallman, 1853 accepted as Nitella opaca (C.Agardh ex Bruzelius) C.Agardh, 1824
23. Species Nitella attenuata (H. & J. Groves) R.D. Wood, 1965 accepted as Nitella opaca var. attenuata H.Groves & J.Groves, 1881 (synonym)
24. Species Nitella australiensis (Nordstedt ex F.M.Bailey) Raam, 1995
25. Species Nitella australis (R.Brown) Kützing, 1857 accepted as Chara corallina C.L.Willdenow, 1805
26. Species Nitella axillaris Braun, 1859
27. Species Nitella axilliformis K.Imahori, 1951
28. Species Nitella axillocarpa J.Groves & E.L.Stephens, 1933
29. Species Nitella barbata (L. Meyen) L. Rabenhorst, 1847 accepted as Lychnothamnus barbatus (Meyen) Leonhardi, 1863
30. Species Nitella baronii H.Groves & J.Groves, 1887
31. Species Nitella bastinii T.F.Allen, 1894
32. Species Nitella batrachosperma C.Agardh, 1824 accepted as Chara vulgaris Linnaeus, 1753
33. Species Nitella batrachosperma A.Braun ex Kützing, 1849 (uncertain)
34. Species Nitella beaugleholii (R.D.Wood) Raam, 2010 (uncertain)
35. Species Nitella belangeri (A.Braun) A.Braun, 1859
36. Species Nitella bengalensis B.C.Kundu, 1941 accepted as Nitella flagellifera var. bengalensis (Kundu) J.C.van Raam, 2010 (synonym)
37. Species Nitella bertolonii Kützing, 1857 accepted as Nitellopsis obtusa (Desvaux) J.Groves, 1919
38. Species Nitella bicornuta F.S.Han & W.Q.Chen, 1982
39. Species Nitella biformis A.Braun, 1849
40. Species Nitella bipartita N.Filarszky, 1934
41. Species Nitella blankinshipii T.F.Allen, 1892
42. Species Nitella blowiana J.Groves, 1928
43. Species Nitella bonaerensis C.Spegazzini, 1883
44. Species Nitella boreali-australis Casanova & Karol, 2023
45. Species Nitella borealis J.H.Wallman, 1853 accepted as Nitella gracilis (J.E.Smith) C.Agardh, 1824
46. Species Nitella borealis F.S.Han & W.Q.Chen, 1978
47. Species Nitella borreri (C.C.Babington) J.H.Wallman, 1853 accepted as Tolypella prolifera (Ziz ex A.Braun) Leonhardi, 1863
48. Species Nitella brachyactis (A.Braun) R.D. Wood, 1965 accepted as Nitella hyalina var. brachyactis A.Braun, 1868 (synonym)
49. Species Nitella brachyclada F.S.Han & W.Q.Chen, 1990
50. Species Nitella brachyteles A.Braun, 1864 accepted as Nitella mucronata var. brachyteles (A.Braun) Raam, 2010 (synonym)
51. Species Nitella brasiliensis A.Braun accepted as Nitella oligospira A.Braun, 1859 (synonym)
52. Species Nitella braunii (C.C.Gmelin) Rabenhorst, 1846 accepted as Chara braunii C.C.Gmelin, 1826
53. Species Nitella braunii Wallman, 1853 accepted as Nitella microcarpa var. sieberi (A.Braun) Raam, 2010 (synonym)
54. Species Nitella brebissonii (A. Braun ex Brébisson) Hy, 1914 accepted as Nitella confervacea (Brébisson) A.Braun ex Leonhardi, 1863 (synonym)
55. Species Nitella brevidactyla F.S.Han & W.Q.Chen, 1982
56. Species Nitella breviteles M.B.Williams, 1959 accepted as Nitella cristata A.Braun, 1852 (synonym)
57. Species Nitella brongniartiana (Weddell) Cosson & Germain de Saint-Pierre, 1845 (uncertain)
58. Species Nitella burmanica B.P.Pal, 1932 accepted as Nitella furcata f. burmanica (B.P.Pal) J.C.van Raam, 2010 (synonym)
59. Species Nitella byssoides A.Braun, 1849 accepted as Nitella tenuissima var. byssoides (A.Braun) A.Braun, 1882 (synonym)
60. Species Nitella californica T.F.Allen, 1894
61. Species Nitella capillaris (A.J.Krocker) J.Groves & G.R.Bullock-Webster, 1920
62. Species Nitella capillata A.Braun, 1867
63. Species Nitella capitata (Nees) C.Agardh, 1824 accepted as Nitella capillaris (A.J.Krocker) J.Groves & G.R.Bullock-Webster, 1920
64. Species Nitella capitellata A.Braun, 1882
65. Species Nitella capitulifera T.F.Allen, 1896 accepted as Nitella acuminata var. capitulifera (T.F.Allen) K.Imahori, 1951 (synonym)
66. Species Nitella caroliniana (K. Imahori & R.D. Wood) R.D. Wood, 1965 accepted as Nitella axillaris var. caroliniana (K.Imahori & R.D.Wood) Raam, 2010 (synonym)
67. Species Nitella cernua Braun, 1859
68. Species Nitella charoides D.Subramanian, 2005
69. Species Nitella chevallierii Hy, 1892 (uncertain)
70. Species Nitella chilensis A.Braun accepted as Nitella flexilis (Linnaeus) C.Agardh, 1824 (synonym)
71. Species Nitella clarkei J.Groves ex Filarszky, 1937 accepted as Nitella grovesii B.C.Kundu, 1937 (synonym)
72. Species Nitella clavata Kützing, 1849
73. Species Nitella clavatoides M.Guerlesquin, 1981
74. Species Nitella claviformis R.Corillion & M.Guerlesquin, 1972
75. Species Nitella claytonii M.T.Casanova, 2007
76. Species Nitella comptonii J.Groves, 1922
77. Species Nitella condensata (Ruprecht) J.H.Wallman, 1853 accepted as Nitella hyalina (De Candolle) C.Agardh, 1824
78. Species Nitella confervacea (Brébisson) A.Braun ex Leonhardi, 1863
79. Species Nitella conformis Nordstedt, 1880
80. Species Nitella confusa (R.D.Wood) Raam, 1995
81. Species Nitella congesta (R.Brown) A.Braun, 1849
82. Species Nitella conglobata A.Braun, 1882 accepted as Nitella lhotzkyi (A.Braun) A.Braun, 1849
83. Species Nitella conifera J.Groves & E.Stephens, 1933
84. Species Nitella corallina (Klein ex Willdenow) C.Agardh, 1824 accepted as Chara corallina C.L.Willdenow, 1805
85. Species Nitella cordobensis E.J.Cáceres, 1975
86. Species Nitella coreana H.Morioka, 1941 accepted as Nitella flagellifera var. coreana (H.Morioka) Raam, 2010 (synonym)
87. Species Nitella cosinensis Stache, 1889 †
88. Species Nitella crispa K.Imahori, 1953
89. Species Nitella cristata A.Braun, 1852
90. Species Nitella crocodylus Casanova & Karol, 2023
91. Species Nitella cuspidata A.Braun, 1858 accepted as Nitella furcata (C.Roxburgh ex A.Bruzelius) C.Agardh, 1824 (nomen nudum)
92. Species Nitella dailyana (R.D. Wood) R.D. Wood, 1965 accepted as Nitella flexilis var. dailyana (R.D.Wood) J.C.van Raam, 2010 (synonym)
93. Species Nitella densa C.C.Jao & Y.Y.Lee, 1974
94. Species Nitella devestita Stache, 1889 †
95. Species Nitella dictyosperma H.Groves & J.Groves, 1898 accepted as Nitella oligospira var. dictyosperma (H.Groves & J.Groves) Raam, 2010 (synonym)
96. Species Nitella diffusa A.Braun, 1882
97. Species Nitella dilatata T.F.Allen, 1894 accepted as Nitella clavata var. dilatata (T.F.Allen) R.D.Wood, 1965 (synonym)
98. Species Nitella dimorpha W.Migula, 1930 accepted as Nitella pulchella T.F.Allen, 1895
99. Species Nitella dispersa A. Braun, 1867 accepted as Nitella flagelliformis A.Braun, 1849
100. Species Nitella divaricata J.Groves & E.Stephens, 1926
101. Species Nitella dixonii H.Groves & J.Groves, 1915
102. Species Nitella doidgeae J.Groves & E.Stephens, 1926
103. Species Nitella dolichodactyla F.S.Han & H.L.Fu, 1982
104. Species Nitella dregeana A.Braun ex Kützing, 1849
105. Species Nitella dualis Nordstedt, 1888
106. Species Nitella duthieae J.Groves & E.Stephens, 1933
107. Species Nitella elegans B.P.Pal, 1932
108. Species Nitella engelmanni (A.Braun) R.D. Wood, 1965 accepted as Nitella hyalina var. engelmanni A.Braun, 1882 (synonym)
109. Species Nitella erecta K.Imahori, 1954
110. Species Nitella euarthra (A.Braun) R.D.Wood, 1965 accepted as Nitella grandis var. euarthra (A.Braun ex Kützing) Raam, 2010 (synonym)
111. Species Nitella exigua (L.Rabenhorst) J.H.Wallman, 1853 accepted as Nitella tenuissima (Desvaux) Kützing, 1843
112. Species Nitella exilis A.Braun, 1847 accepted as Nitella mucronata (A.Braun) F.Miquel, 1840
113. Species Nitella expansa T.F.Allen, 1898 accepted as Nitella orientalis var. expansa (T.F.Allen) J.C. van Raam, 2010 (synonym)
114. Species Nitella fallosa H.Morioka, 1940 accepted as Nitella furcata (C.Roxburgh ex A.Bruzelius) C.Agardh, 1824 (synonym)
115. Species Nitella fascicularis N.Filarszky & G.O.Allen, 1937 accepted as Nitella flagellifera var. fascicularis (N.Filarszky) J.C.van Raam, 2010 (synonym)
116. Species Nitella fasciculata (Amici) A.Braun, 1847 accepted as Tolypella intricata (Trentepohl ex Roth) Leonhardi, 1863
117. Species Nitella flabellata Kützing, 1843 accepted as Nitella mucronata (A.Braun) F.Miquel, 1840
118. Species Nitella flagellifera J.Groves & G.O.Allen, 1927
119. Species Nitella flagelliformis A.Braun, 1849
120. Species Nitella flexilis (Linnaeus) C.Agardh, 1824
121. Species Nitella forestii J.P.Sinha & M.C.Chaudhary, 1968
122. Species Nitella formosa T.F.Allen, 1893 accepted as Nitella hyalina f. formosa (T.F.Allen) J.C.van Raam, 2010 (synonym)
123. Species Nitella furcata (C.Roxburgh ex A.Bruzelius) C.Agardh, 1824
124. Species Nitella furculata (Reichenbach) C.F.O.Nordstedt, 1863 accepted as Nitella flexilis (Linnaeus) C.Agardh, 1824
125. Species Nitella ganocziana Ullepitsch
126. Species Nitella gelatinifera R.D.Wood, 1965 accepted as Nitella gelatinosa A.Braun, 1849
127. Species Nitella gelatinosa A.Braun, 1849
128. Species Nitella gigantea H.Kasaki, 1954 accepted as Nitella megacarpa T.F.Allen, 1880
129. Species Nitella glaziovii G.Zeller, 1876 accepted as Nitella microcarpa var. glaziovii (G.Zeller) J.S.Zaneveld, 1940 (synonym)
130. Species Nitella globulifera B.P.Pal, 1932
131. Species Nitella globulus Stache, 1889 †
132. Species Nitella gloeostachys A.Braun, 1849
133. Species Nitella glomerata (Desvaux) F.F.Chevalier, 1827 accepted as Tolypella glomerata (Desvaux) Leonhardi, 1863
134. Species Nitella glomerata C.C.Jao & Y.Y.Lee, 1974
135. Species Nitella glomerulifera (Ruprecht) J.Wallman, 1853 accepted as Tolypella glomerata (Desvaux) Leonhardi, 1863
136. Species Nitella glomerulifera A.Braun, 1867 accepted as Nitella acuminata var. greenii R.D.Wood, 1965 accepted as Nitella subglomerata var. greenii (R.D.Wood) Raam, 2010 (nomen nudum)
137. Species Nitella gollmeriana Braun, 1859
138. Species Nitella gracilens H.Morioka, 1941
139. Species Nitella graciliformis J.Groves, 1928
140. Species Nitella gracilis (J.E.Smith) C.Agardh, 1824
141. Species Nitella gracillima T.F.Allen, 1898
142. Species Nitella grandis A.Braun ex Kützing, 1857
143. Species Nitella greenii (R.D. Wood) R.D. Wood, 1965 accepted as Nitella subglomerata var. greenii (R.D.Wood) Raam, 2010 (synonym)
144. Species Nitella grovesii B.C.Kundu, 1937
145. Species Nitella guangdongensis Y.J.Li, 1985
146. Species Nitella guangxiensis Y.J.Ling, G.Z.Deng & Z.Li, 1992
147. Species Nitella guineensis Kützing, 1849 accepted as Nitella microcarpa var. sieberi (A.Braun) Raam, 2010 (synonym)
148. Species Nitella guizhouensis H.L.Fu & F.S.Han, 1990
149. Species Nitella gunnii A.Braun, 1857 accepted as Nitella penicillata A.Braun, 1849
150. Species Nitella haageniae Raam, 1995
151. Species Nitella habrocoma J.Groves & E.L.Stephens, 1933
152. Species Nitella hanyangensis C.C.Jao & Y.Y.Lee, 1974
153. Species Nitella haplodactyla W.Q.Chen & F.S.Han, 1990
154. Species Nitella hasskarlii R.D.Wood, 1965 accepted as Nitella acuminata var. indica A.Braun, 1882 (synonym)
155. Species Nitella havaiensis Nordstedt, 1878
156. Species Nitella heterodactyla N.Filarszky & G.O.Allen, 1937
157. Species Nitella heterophylla (A.Braun) A.Braun, 1849
158. Species Nitella heteroteles J.Groves & E.L.Stephens, 1933
159. Species Nitella hokouensis F.S.Han & W.Q.Chen, 1982
160. Species Nitella hookeri A.Braun, 1849
161. Species Nitella horikawae K.Imahori, 1953
162. Species Nitella hotchkissii D.R.Tindall, 1967
163. Species Nitella huillensis (A.Braun & F.Welwitsch) T.F.Allen, 1888
164. Species Nitella hupehensis C.C.Jao & Y.Y.Lee, 1974
165. Species Nitella hyalina (De Candolle) C.Agardh, 1824
166. Species Nitella ignescens A.García, 1998
167. Species Nitella imahorii R.D.Wood, 1962
168. Species Nitella imperialis (T.F.Allen) H.Sakayama, 2005
169. Species Nitella inaequabilis Y.Y.Li, 1985
170. Species Nitella inaequalis J.Groves, 1928
171. Species Nitella inaequipartita L.B.Liang, 1989
172. Species Nitella incerta Krasavina, 1967 †
173. Species Nitella inokasiraensis (Kasaki ex R.D.Wood) R.D.Wood, 1965 accepted as Nitella mirabilis var. inokasiraensis (Kasaki ex R.D.Wood) R.D.Wood, 1965 (synonym)
174. Species Nitella intermedia C.F.O Nordstedt, 1880
175. Species Nitella interrupta A.Braun, 1863 accepted as Nitella leonhardii R.D.Wood, 1952
176. Species Nitella intricata (Trentepohl ex Roth) C.Agardh, 1824 accepted as Tolypella intricata (Trentepohl ex Roth) Leonhardi, 1863
177. Species Nitella inversa K.Imahori, 1954
178. Species Nitella iyengarii M.C.Choudhury, 1971
179. Species Nitella jaoi F.S.Han, 1958
180. Species Nitella japonica T.F.Allen, 1893
181. Species Nitella javanica (A.Braun) Raam, 2010 (uncertain)
182. Species Nitella kamaensis Krassavina, 1966 †
183. Species Nitella kanagambigae D.Subramanian, 1983
184. Species Nitella knightiae J.Groves & E.L.Stephens, 1933
185. Species Nitella kolachiappensis D.Subramanian, 1983
186. Species Nitella lamyana Hy, 1890 (uncertain)
187. Species Nitella laxa T.F.Allen, 1896 accepted as Nitella flexilis var. longifolia f. laxa (T.F.Allen) J.C.van Raam, 2010 (synonym)
188. Species Nitella lechleri A.Braun ex H.Horn af Rantzien, 1950
189. Species Nitella leibergii T.F.Allen, 1896
190. Species Nitella leonhardii R.D.Wood, 1952
191. Species Nitella leptoclada A.Braun, 1868
192. Species Nitella leptodactyla J.Groves, 1922
193. Species Nitella leptosoma Nordstedt, 1880
194. Species Nitella leptostachys A.Braun, 1849
195. Species Nitella lhotzkyi (A.Braun) A.Braun, 1849
196. Species Nitella limosa Casanova & Karol, 2023
197. Species Nitella lindheimeri (A.Braun) A.Braun, 1859 accepted as Nitella acuminata var. lindheimeri A.Braun, 1849 accepted as Nitella subglomerata var. lindheimeri (A.Braun) J.C.van Raam, 2010 (synonym)
198. Species Nitella longicaudata F.S.Han & W.Q.Chen, 1982
199. Species Nitella longicoronula C.C.Jao & Y.Y.Lee, 1974
200. Species Nitella longifurca (F.J.Ruprecht) Wallman, 1853 accepted as Nitella hyalina (De Candolle) C.Agardh, 1824
201. Species Nitella macilenta A. Braun, 1965 accepted as Nitella dregeana var. macilenta (A.Braun) Raam, 2010 (synonym)
202. Species Nitella macounii (T.F.Allen) T.F.Allen, 1888
203. Species Nitella macrosperma A.Braun ex Kützing, 1849 accepted as Nitella opaca (C.Agardh ex Bruzelius) C.Agardh, 1824
204. Species Nitella madagascariensis Zaneveld, 1939
205. Species Nitella mariammai D.Subramanian, 2002
206. Species Nitella martinii Casanova & Karol, 2023
207. Species Nitella maruyamae H.Kasaki, 1954 accepted as Nitella orientalis f. maruyamae (H.Kasaki) Raam, 2010 (synonym)
208. Species Nitella masoniae (R.T.Wood) M.T.Casanova, 2007
209. Species Nitella mauritiana A.Braun, 1868 accepted as Nitella acuminata var. mauritiana A.Braun, 1882 (synonym)
210. Species Nitella maxima (A.Braun ex Migula) R.D.Wood, 1965 accepted as Nitella hyalina f. maxima A.Braun ex Migula, 1890 (synonym)
211. Species Nitella megacarpa T.F.Allen, 1880
212. Species Nitella megacephala E.-Y.Lee & S.-R.Lee, 2019
213. Species Nitella megaspora (J.Groves) H.Sakayama, 2004
214. Species Nitella mexicana T.F.Allen, 1894
215. Species Nitella micklei M.T.Casanova, 2013
216. Species Nitella microcarpa A.Braun, 1859
217. Species Nitella microglochin A. Braun, 1882 accepted as Nitella microcarpa var. microglochin (A.Braun) J.S.Zaneveld, 1941 (synonym)
218. Species Nitella micronesiaca K.Imahori, 1952
219. Species Nitella microphylla A.Braun, 1849 (uncertain)
220. Species Nitella microteles M.B.Williams, 1959
221. Species Nitella mikawaënsis (R.D. Wood) R.D. Wood, 1965 accepted as Nitella allenii f. mikawaënsis R.D.Wood, 1962 (synonym)
222. Species Nitella minispora K.Imahori & H.Suga, 1958 accepted as Nitella gracillima var. minispora (K.Imahori & H.Suga) J.C.van Raam, 2010 (synonym)
223. Species Nitella minuta T.F.Allen, 1888
224. Species Nitella mirabilis Nordstedt ex J.Groves, 1924
225. Species Nitella missouriensis T.F.Allen, 1892 accepted as Nitella blankinshipii var. missouriensis (T.F.Allen) J.C.van Raam, 2001 (synonym)
226. Species Nitella moniliformis H.Morioka, 1941 accepted as Nitella rigida var. moriokae (R.D.Wood) J.C.van Raam, 2010 (synonym)
227. Species Nitella moniliformis J.S.Zaneveld, 1940
228. Species Nitella monodactyla A.Braun, 1882
229. Species Nitella monopodiata Raam, 1995
230. Species Nitella montana T.F.Allen, 1892
231. Species Nitella moorei J.Groves ex Filarszky, 1837 accepted as Nitella cristata A.Braun, 1852 (synonym)
232. Species Nitella moramangaënsis R.D. Wood, 1965 accepted as Nitella megaspora (J.Groves) H.Sakayama, 2004
233. Species Nitella moriokae R.D.Wood, 1952 accepted as Nitella rigida var. moriokae (R.D.Wood) J.C.van Raam, 2010 (synonym)
234. Species Nitella morongii T.F.Allen, 1887
235. Species Nitella mucosa (Nordstedt) J.Groves, 1922
236. Species Nitella mucronata (A.Braun) F.Miquel, 1840
237. Species Nitella multifera C.C.Jao & Y.Y.Lee, 1981
238. Species Nitella multipartita T.F.Allen, 1898
239. Species Nitella musasiensis Morioka, 1941 accepted as Nitella microcarpa var. musasiensis (H.Morioka) Raam, 2010 (synonym)
240. Species Nitella muthnatae T.F.Allen, 1887 accepted as Nitella pseudoflabellata var. mathuatae (T.F.Allen) R.D.Wood, 1965 (synonym)
241. Species Nitella myriocarpa F.S.Han & W.Q.Chen, 1986
242. Species Nitella myriotricha A.Braun ex Kützing, 1857
243. Species Nitella nanjingensis F.S.Han & G.X.Wang, 1990
244. Species Nitella nenjiangensis W.T.Su & Y.J.Wang, 1990
245. Species Nitella neyrautii Hy, 1914 (uncertain)
246. Species Nitella nicobarica (A.Braun) R.D.Wood, 1965 accepted as Nitella furcata var. nicobarica (A.Braun) J.S.Zaneveld, 1940
247. Species Nitella nidifica (Müller) C.Agardh, 1824 accepted as Tolypella nidifica (O.F.Müller) Leonhardi, 1864
248. Species Nitella nilgherensis D.Subramanian, 2000
249. Species Nitella nordstedtiana H.Groves & J.Groves, 1890 accepted as Nitella confervacea (Brébisson) A.Braun ex Leonhardi, 1863
250. Species Nitella nordstedtii (Hy) Hy, 1914 accepted as Nitella confervacea (Brébisson) A.Braun ex Leonhardi, 1863
251. Species Nitella nordstedtti (Hy) Hy, 1914 accepted as Nitella confervacea (Brébisson) A.Braun ex Leonhardi, 1863 (synonym)
252. Species Nitella normaniana C.F.O.Nordstedt, 1868 accepted as Tolypella normaniana C.F.O.Nordstedt, 1868
253. Species Nitella norvegica J.H.Wallman, 1853 accepted as Nitella mucronata (A.Braun) F.Miquel, 1840
254. Species Nitella obscura R.D.Wood, 1965 accepted as Nitella acuminata var. belangeri A.Braun, 1849 (synonym)
255. Species Nitella obtusa T.F.Allen, 1892
256. Species Nitella occidentalis T.F.Allen, 1894 accepted as Nitella blankinshipii var. occidentalis (T.F.Allen) J.C.van Raam, 2010 (synonym)
257. Species Nitella ogivalis J.Groves & E.Stephens, 1933
258. Species Nitella oligogyra H.Morioka, 1941 accepted as Nitella spiciformis var. oligogyra (H.Morioka) K.Imahori, 1954 (synonym)
259. Species Nitella oligospira A.Braun, 1859
260. Species Nitella oollooensis Casanova & Karol, 2023
261. Species Nitella opaca (C.Agardh ex Bruzelius) C.Agardh, 1824
262. Species Nitella orientalis T.F.Allen, 1894
263. Species Nitella ornithopoda A.Braun, 1863
264. Species Nitella pachyarthra F.von Mueller, 1940 accepted as Chara australis var. nobilis A.Braun, 1882
265. Species Nitella pakistanica M.A.F.Faridi, 1956 accepted as Nitella pseudotenuissima var. pakistanica (M.A.F.Faridi) Raam, 2010 (synonym)
266. Species Nitella paludigena M.T.Casanova & K.G.Karol, 2008
267. Species Nitella paludosa H.L. Fu & F.S. Han, 1990
268. Species Nitella papillata F.S.Han & W.Q.Chen, 1982
269. Species Nitella papuana (J.S.Zanevald) R.D.Wood, 1965 accepted as Nitella microcarpa var. papuana J.S.Zaneveld, 1940 (synonym)
270. Species Nitella parooensis M.T.Casanova & J.L.Porter, 2013
271. Species Nitella partita Nordstedt, 1891
272. Species Nitella patula J.Groves & G.O.Allen, 1927 accepted as Nitella flagellifera var. patula (J.Groves & G.O.Allen) J.C.van Raam, 2010 (synonym)
273. Species Nitella paucicostata T.F.Allen, 1894 accepted as Nitella C.Agardh, 1824
274. Species Nitella pedunculata C.Agardh, 1824 accepted as Nitella opaca (C.Agardh ex Bruzelius) C.Agardh, 1824
275. Species Nitella penicillata A.Braun, 1849
276. Species Nitella petchii J.Groves ex N.Filarszky, 1937
277. Species Nitella phauloteles J.Groves, 1927
278. Species Nitella plumosa A.Braun, 1868
279. Species Nitella plurifurcata F.S.Han & H.L.Fu, 1982
280. Species Nitella polycarpa B.P.Pal, 1932 accepted as Nitella furcata f. polycarpa (B.P.Pal) R.D.Wood, 1965 (synonym)
281. Species Nitella polycephala (A.Braun) Kützing, 1857
282. Species Nitella polyglochin A.Braun ex Nordstedt, 1882
283. Species Nitella polygyra A.Braun ex Kützing, 1857
284. Species Nitella polymorpha F.S.Han, 1963
285. Species Nitella polysperma (A.Braun) Kützing, 1843 accepted as Tolypella intricata (Trentepohl ex Roth) Leonhardi, 1863
286. Species Nitella praeclara J.Groves & E.Stephens, 1926
287. Species Nitella praelonga A.Braun, 1882
288. Species Nitella procera F.S.Han & W.Q.Chen, 1982 accepted as Nitella gracillima var. minispora (K.Imahori & H.Suga) J.C.van Raam, 2010 (synonym)
289. Species Nitella procera J.H.Wallman, 1853 (unaccepted)
290. Species Nitella prolifera (Ziz ex A.Braun) Kützing, 1845 (unaccepted)
291. Species Nitella prolifera C.C.Jao & Y.Y.Lee, 1974 (unaccepted)
292. Species Nitella pseudoconglobata (R.D.Wood) R.D.Wood, 1965 (unaccepted, synonym)
293. Species Nitella pseudoflabellata A.Braun, 1882
294. Species Nitella pseudoflabelleta (unaccepted)
295. Species Nitella pseudograciliformis N.Filarszky, 1934 (unaccepted)
296. Species Nitella pseudohyalina F.S.Han & W.Q.Chen, 1982
297. Species Nitella pseudopapillata H.L.Fu & F.S.Han, 1990
298. Species Nitella pseudotenuissima B.C.Kundu, 1941
299. Species Nitella pulchella T.F.Allen, 1895
300. Species Nitella pusilla K.Imahori, 1954
301. Species Nitella pygmaea A.Braun, 1882 (unaccepted, synonym)
302. Species Nitella quadriscutulum C.C.Jao & Y.Y.Lee, 1974
303. Species Nitella rarissima W.Q.Chen & F.S.Han, 1990
304. Species Nitella rasilis H.L.Fu & F.S.Han, 1990
305. Species Nitella remota A.Braun, 1882
306. Species Nitella renovii (Hy) Hy, 1914 (unaccepted)
307. Species Nitella reticulata M.B.Williams, 1959
308. Species Nitella rigida T.F.Allen, 1898
309. Species Nitella robertsonii A.Braun, 1882
310. Species Nitella robusta Imahori, 1954 (unaccepted, synonym)
311. Species Nitella robusta Stache, 1889 †
312. Species Nitella rosa-mariae N.N. Picelli-Vicentim, 2004
313. Species Nitella roxburghii A.Braun, 1849 (unaccepted, synonym)
314. Species Nitella saharanpurensis G.O.Allen, 1961
315. Species Nitella saitoiana T.F.Allen, 1898 (unaccepted, synonym)
316. Species Nitella sanukensis (K. Imahori) R.D. Wood, 1965 (unaccepted, synonym)
317. Species Nitella sejuncta K.Imahori, 1953
318. Species Nitella sessilis Y.J.Li, 1985
319. Species Nitella setchellii (R.D. Wood) R.D. Wood, 1965 (unaccepted, synonym)
320. Species Nitella shandongensis Y.J.Ling, G.Z.Deng & Z.Li, 1992
321. Species Nitella shinii K.Imahori, 1953
322. Species Nitella sieberi (A.Braun) R.D.Wood, 1965 (unaccepted, synonym)
323. Species Nitella silicea Casanova & Karol, 2023
324. Species Nitella simaneënsis R.D. Wood, 1965 (unaccepted, synonym)
325. Species Nitella simonii Hy, 1914 (uncertain)
326. Species Nitella smithii (C.C.Babington) L.H.Wallman, 1853 (unaccepted)
327. Species Nitella sonderi A.Braun, 1852
328. Species Nitella spanioclema J.Groves & Bullock-Webster ex Bullock-Webster, 1919 (unaccepted, synonym)
329. Species Nitella sphaerocephala J.Groves, 1928
330. Species Nitella spiciformis H.Morioka, 1941
331. Species Nitella spinosa K.Imahori, 1953
332. Species Nitella stabilis K.Imahori, 1949
333. Species Nitella stacheana (Unger) Stache, 1889 †
334. Species Nitella stellaris T.F.Allen, 1896
335. Species Nitella stelligera (A.Bauer) Kützing, 1843 (unaccepted)
336. Species Nitella stenhammariana (J.H.Wallman) J.H.Wallman, 1853 (unaccepted, synonym)
337. Species Nitella stricta K.Imahori, 1953
338. Species Nitella struthioptila J.Groves & E.Stephens, 1933
339. Species Nitella stuartiana F.Müller ex Kützing, 1857 (unaccepted, synonym)
340. Species Nitella stuartii A.Braun, 1852
341. Species Nitella subglomerata A.Braun, 1858
342. Species Nitella subimpressa Stache, 1889 †
343. Species Nitella sublucens T.F.Allen, 1895
344. Species Nitella subspicata T.F.Allen, 1896 (unaccepted, synonym)
345. Species Nitella subtilissima A.Braun, 1849
346. Species Nitella subtilissimoides (R.D. Wood) R.D. Wood, 1965 (unaccepted, synonym)
347. Species Nitella sumatrana N.Filarszky, 1934
348. Species Nitella superba B.P.Pal, 1932
349. Species Nitella syncarpa (J.L.Thuillier) Kützing, 1845
350. Species Nitella szechwanensis F.S.Han, 1958
351. Species Nitella tanakiana T.F.Allen, 1898 (unaccepted, synonym)
352. Species Nitella tasmanica F.Müller ex A.Braun, 1852
353. Species Nitella temiscouatae T.F.Allen, 1892 (unaccepted, synonym)
354. Species Nitella tenuissima (Desvaux) Kützing, 1843
355. Species Nitella terrestris M.O.P.Iyengar, 1958
356. Species Nitella thillaiammai D.Subramanian, 1985
357. Species Nitella tolypelloides M.M.Picelli-Vicentim, 1992
358. Species Nitella townsendii Casanova, 2023
359. Species Nitella transilis T.F.Allen, 1896
360. Species Nitella translucens (Persoon) C.Agardh, 1824
361. Species Nitella transvaliensis Raam, 2010 (unaccepted, synonym)
362. Species Nitella tricellularis (Nordstedt) Nordstedt, 1888
363. Species Nitella trichoides F.Han & W.Chen, 1986
364. Species Nitella tricuspis A.Braun, 1867 (unaccepted, synonym)
365. Species Nitella tuberculata B.C.Kundu, 1937 (unaccepted, synonym)
366. Species Nitella tubulosa P.Salzmann, 1830 (unaccepted)
367. Species Nitella tumida Nordstedt, 1891
368. Species Nitella tumulosa J.S.Zaneveld, 1940
369. Species Nitella tuyamae K.Imahori, 1953
370. Species Nitella ulvoides (Bertoloni) Kützing, 1843 (unaccepted)
371. Species Nitella ungula A.García, 1998
372. Species Nitella uruguayensis H.Horn af Rantzien, 1950 (unaccepted, synonym)
373. Species Nitella varians C.C.Jao & Y.Y.Lee, 1974
374. Species Nitella vermiculata J.Groves, 1928 (unaccepted, synonym)
375. Species Nitella vermiformis H.L.Fu & F.S.Han, 1991
376. Species Nitella verticillata (N.Filarszky & G.O.Allen ex N.Filarszky) R.D.Wood, 1962
377. Species Nitella vieillardii (A.Braun) H.Sakayama, 2005
378. Species Nitella virgata J.Wallman (unaccepted)
379. Species Nitella wahlbergiana J.Wallman, 1853
380. Species Nitella wattii J.Groves, 1924 (unaccepted, synonym)
381. Species Nitella woodii A.T.Hotchkiss & K.Imahori, 1987
382. Species Nitella zamanii Naz, Diba & Schubert, 2014
383. Species Nitella zeyheri A.Braun ex Kützing, 1857
384. Species Nitella zollingeri (A.Braun) R.D.Wood, 1965 (unaccepted, synonym)

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