Calothrix stellaris Bornet et Flahault

Unclear species.
Filis sparsis vel gregariis, stellatim radiantibus, a basii incrassato-bulbosa sensirn attenuatis, in media parte 10-12 mu crassis, falcato-incurvis, basi curvatis; vagina tenui arcta, unifmi, hyalina; trichomatibus aeru gineis, 6-7 mu crassis, apice in pilum tenuem productis, articulis dianetro semibrevioribus, geniculis haud contractis; heterocistis basilaribus 1-3 (v. s.).
Hab. in aquis stagnantibus in paludibus Americae australis prope Montevideo; mense mario 1884, leg . J . Arechavaleta.