Subgenus: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species [ var. gracile ]: Cell body 28-47 μm long, 39-77 μm wide (including arms), isthmus 8.4-11 μm;
[ var. coronulatum Boldt ]: Cell body 26-28 μm long, 34-41 μm wide (including arms), isthmus 6.5-10 μm;
[ var. ornatum Krieger ]: Cell body 38.7 μm long, 62.4 μm wide (including arms), isthmus 13 μm; a pair of warts present at each posterior margin of semicells (Illustrations of The Japanese Fresh-water Algae, 1977)
Google Image Search
| var. gracile: Cell body 39-77 μm wide (including arms) | |||
S. gracile v. gracile ?? x 60 μm Azami-ike Norikura highland Nagano, 2006  |
S. gracile v. gracile 26 x 44 μm Kosugi Toyama, 2002 |
S. gracile ? v. gracile ? 25 x 48 μm three arms Japan, 1997 |
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| Others: Cell body 34-41 μm wide (including arms) | |||
S. gracile ? v. coronulatum ? μm O-ike park Yabuki Fukushima, 2003 |
S gracile v. coronulatum ? 18 x 41 μm USA, 1999 |
S gracile v. coronulatum ? 25 x 34 μm Sanda Hyogo, 2001 |
S gracile v. coronulatum ? 20 x 34 μm Shikinawa-ike Fukuoka, 2001 |
S. gracile v. coronulatum ? μm near Yamaguchi Univ. Yamaguchi, 2004 |
S. gracile v. coronulatum ? 20 x 30 μm Futayo-no-ike Haguro mountain Yamagata, 2005 |
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S. gracile ? v. ornatum ? 26 x 38-41 μm Kosugi Toyama, 2002 |
S. gracile v. ornatum ??? 21 x 41 μm Shikinawa-ike Fukuoka, 2001 |
S. gracile ? v. ornatum ??? 25 x 28 μm Chichibu Muse Park Saitama, 2003 |
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