Northwest Atlantic, USA, Massachusetts, Woods Hole region, Vineyard Sound, Vineyard Haven, and Little Harbor (geocoordinates not provided, estimated with gazetteer to be approximately lat. 41.5º, long. -70.6º); in association with colonies of Amaroecium pellucidum (= Aplidium pellucidum), on piles among Cynthia, and with colonies of Polydora colonia, between 7-17 fathoms (12.8-31 m)