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Gamophyceae: Desmidales: Mesotaeniaceae
(Charophyceae: Zygnematales: Mesotaeniaceae)

 Cylindrocystis gracilis
I.Hirn
Syn. C. brebissonii var. minor W. et G.S. West

Penium cylindrus Genus: Two chloroplasts with axis and laminae structure; axis short, laminae also short making the chloroplasts star-shaped
Species: Cell body cylindrical, distinctly broader than 10 μm; chloroplasts with longitudinal, twisting ridges (Coesel & Meesters, 2007).
Similar genus -->> Zygnema; Penium; Mesotaenium;

Cylindrocystis gracilis (formerly, C. brebissonii var. minor) ?, cell body 49-80 μm long, 12 μm wide, L/W=4.1-6.7, x 640, Koigakubo marsh, Tessei-cho, Okayama Pref., Japan, November 22, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Penium cylindrus Penium cylindrus Penium cylindrus
Cell body 37 μm long, 12 μm wide, L/W=3.1, x 640
Penium cylindrus Penium cylindrus

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