Penium

Penium
Penium polymorphum
Sistematika
Carstvo:	Plantae
Divizija:	Charophyta
Razred:	Conjugatophyceae
Red:	Desmidiales
Porodica:	Peniaceae Haeckel, 1894
Rod:	Penium Brébisson ex Ralfs, 1848

Penium, rod parožina smješten u vlastitu porodicu Peniaceae, dio reda Desmidiales. Postoji 41 priznata vrsta

Vrste

1. Penium amplificatum (M.Schmidt) Van Westen & Coesel
2. Penium asperum Petkoff
3. Penium barbaricum Claassen
4. Penium bisporum W.B.Turner
5. Penium blandum Raciborski
6. Penium brefeldii Istvànffi [Istvanfy]
7. Penium conspersum Wittrock C
8. Penium costatum Hodgetts
9. Penium cuticulare West & G.S.West
10. Penium cylindraceum Kurt Förster
11. Penium cylindrus Brébisson ex Ralfs
12. Penium delicatulum Joshua
13. Penium diadematum Reinsch
14. Penium exiguum West
15. Penium gonatozygiforme Claassen
16. Penium heimerlianum Schmidle
17. Penium incrassatum Maskell
18. Penium lewisii W.B.Turner
19. Penium libellula (Focke ex Nordstedt) Nordstedt
20. Penium margaritaceum Brébisson - tipična
21. Penium mesianum Claassen
22. Penium multicostatum Scott & Grönblad
23. Penium navigium W.B.Turner
24. Penium poeltianum Kurt Förster
25. Penium polymorphum (Perty) Perty
26. Penium pseudocostatum Suxena & Venkateswarlu
27. Penium pseudorufescens Claassen
28. Penium rotundum W.B.Turner
29. Penium rupestre (Kützing) Rabenhorst
30. Penium simplex W.B.Turner
31. Penium spinulosum (Wolle) Gerrath
32. Penium spiroplastidium Prescott
33. Penium spirostriolatiforme West & G.S.West
34. Penium spirostriolatum J.Barker
35. Penium subcucurbitinum Claassen
36. Penium sublamellosum W.B.Turner
37. Penium subrufescens Borge
38. Penium subspirostriolatiforme Grönblad
39. Penium substriatum M.Hirano
40. Penium terrestre C.C.Jao
41. Penium thwaitesii Ralfs