is a species of plant in the class Conjugatophyceae (Conjugating Green Algae) in the family Peniaceae and order Desmidiales.
Penium costatum
Penium cylindrus
Penium didymocarpum
Penium exiguum
Penium libellula
Penium margaritaceum
Penium minutum
Penium oblongum
Penium phymatosporum
Penium polymorphum
Penium rupestre
Penium silvaenigrae
Penium spinospermum
Penium spinulosum
Penium spirostriolatum