Peniaceae

Penium
Penium polymorphum
Scientific classification
Domain:	Eukaryota
Kingdom:	Plantae
Division:	Charophyta
Class:	Zygnematophyceae
Order:	Desmidiales
Family:	Peniaceae
Genus:	Penium Bréb. ex Ralfs
Species
P. cylindrus P. exiguum P. margaritaceum P. spirostriolatum

Penium is a genus of green algae, and the sole member of the family Peniaceae. The genus contains about 39 species.

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Wikipedia