Species [var. pachydermum]:
Cell body 78-117 μm long, 60-87 μm wide, isthmus 25-34 μm wide,
semicells semielliptical in shape, corners rounded. [var. aethiopicum W. et G.S. West ]: Semicells nearly half-circle; cellwall thin; cell body 64-107 μm long, 56-80 μm wide, isthmus 28-34 μm wide. [var. ellipticum Hinode ]: Semicells rectangular at base; curvature of lateral margins weak compared to var. pachydermum; cell body 94-100 μm long, 67-74 μm wide, isthmus 28-34 μm wide. [var. heptagonum Grönblad ]: Semicells irregular pentagon in shape; posterior half of lateral margins nearly straight; cell body 94-100 μm long, 67-74 μm wide, isthmus 28-34 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977). |
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Cosmarium pachydermum P. Lundell var. pachydermum ?,
cell body μm long, μm wide,
shape of chloroplasts is different from ordinary ones (small spindle-shaped or incized to form many ribbons),
x 640, Koshigaya, Saitama Pref., Japan, July 2001 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
