Species [var. pseudopyramidatum]:
Cell body medium in size, 42-61 μm long, 25-41 μm wide, L/W=1.8,
isthmus 12.5-14 μm wide;
semicells pyramidal or semielliptical in shape with flattened apex, basal corners rounded, lateral margins convex;
a single chloroplast in each semicell.
[var. stenonotum Nordstedt f. minor Raciborski]:
Cell body small, 28-42 μm long, 24-25 μm wide, isthmus 10-11 μm wide.
[var. carniolicum Lütkemüller]:
Cell body 46-59 μm long, 29-34 μm wide, L/W=1.5, isthmus 12.6-14 μm wide;
lateral margins concave (Illustrations of The Japanese Fresh-water Algae, 1977).
|