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Gamophyceae: Desmidales: Desmidiaceae
(Charophyceae: Zygnematales: Desmidiaceae)

 Micrasterias crux-melitensis
(Ehrenberg) Hassall ex Ralfs var. crux-melitensis

Micrasterias crux-melitensis Genus: Cell body flat, large, variable in shape, longer than wide; strong constriction at center; each semicell with several notches; cell wall with many short spines (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: 102-129 μm long, 84-124 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Micrasterias crux-melitensis Hassall var. crux-melitensis, cell body 118 μm long, 90 μm wide (L/W=1.3), isthmus 20 μm wide, x 640, rice field near Oyomi marsh, Hakuba village, Nagano Pref., Japan, October 3, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Micrasterias crux-melitensis Micrasterias crux-melitensis
Cell body 100 μm long, 87 μm wide (L/W=1.1), isthmus 17 μm wide, x 640
Micrasterias crux-melitensis Micrasterias crux-melitensis Micrasterias crux-melitensis

* Micrasterias crux-melitensis (Ehrenberg) Hassall ex Ralfs 1848 var. crux-melitensis: 102-129 μm long, 84-124 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Micrasterias crux-melitensis (Ehrenberg) Hassall ex Ralfs 1848 var. superflua Turner: 116 μm long, 116 μm wide; constriction 17 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Micrasterias radiata Hassall: 123-(140)-195 μm long, 113-(140)-186 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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