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Plantae
Viridiplantae
Streptophyta
Charophyta
[Charophytina]
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[Mesostigmatophytina]
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[Zygnematophyceae]
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Penium
Penium costatum
Penium cylindrus
Penium cylindrus var. cylindrus
Penium cylindrus var. subtruncatum
Penium didymocarpum
Penium exiguum
Penium libellula
Penium margaritaceum
Penium margaritaceum var. elongatum
Penium margaritaceum var. margaritaceum
Penium minutum
Penium oblongum
Penium phymatosporum
Penium polymorphum
Penium rupestre
Penium silvaenigrae
Penium silvaenigrae var. parallelum
Penium silvaenigrae var. silvaenigrae
Penium spinospermum
Penium spinulosum
[
Pleurotaenium spinulosum
]
Penium spirostriolatum