Penium, rod parožina smješten u vlastitu porodicu Peniaceae, dio reda Desmidiales. Postoji 42 priznata vrstaAlgaeBasepristupljeno 6. svibnja 2022 Vrste
Penium amplificatum (M.Schmidt) Van Westen & Coesel Penium asperum Petkoff Penium barbaricum Claassen Penium berginii Archer Penium bisporum W.B.Turner Penium blandum Raciborski Penium brefeldii Istvànffi [Istvanfy] Penium brevicylindricum Kozłowski Penium conspersum Wittrock C Penium costatum Hodgetts Penium cylindraceum Kurt Förster Penium cylindrus Brébisson ex Ralfs Penium delicatulum Joshua Penium diadematum Reinsch Penium exiguum West Penium gonatozygiforme Claassen Penium heimerlianum Schmidle Penium incrassatum Maskell Penium jenneri Cholnoky Penium lewisii W.B.Turner Penium libellula (Focke ex Nordstedt) Nordstedt Penium margaritaceum Brébisson - tipična Penium mesianum Claassen Penium multicostatum Scott & Grönblad Penium navigium W.B.Turner Penium poeltianum Kurt Förster Penium polymorphum (Perty) Perty Penium pseudocostatum Suxena & Venkateswarlu Penium pseudorufescens Claassen Penium rotundum W.B.Turner Penium rupestre (Kützing) Rabenhorst Penium simplex W.B.Turner Penium spinulosum (Wolle) Gerrath Penium spiroplastidium Prescott Penium spirostriolatiforme West & G.S.West Penium spirostriolatum J.Barker Penium subcucurbitinum Claassen Penium sublamellosum W.B.Turner Penium subrufescens Borge Penium subspirostriolatiforme Grönblad Penium substriatum M.Hirano Penium thwaitesii Ralfs
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Kategorija:Desmidiales