Species [var. macilentum ]: Cell body large, elongated, both side nearly straight at central region, slightly tapered and curved toward ends, 260-(432-678)-800 μm long, 11-(14-21)-25 μm wide, L/W=25-40; cell wall smooth, transparent, bands present; 6-15 pyrenoids in each semicell.
[ var. japonicum ]: Cell body wider at the center and narrower at ends than var. macilentum, 400-(447-5780-600 μm long, 23-(32-34) μm wide, L/W=12-18; cell wall finely striated (Illustrations of The Japanese Fresh-water Algae, 1977).
T=terminal; Tv=terminal vacuole

Google Image Search

var. japonicum: Cell body centrally wider than var. macilentum; 400-600 μm long, 23-34 μm wide, L/W= 12-18
C. macilentum v. japonicum ? 728 x 28.5 μm L/W=25.5 Onnenai Kushiro marsh Hokkaido, 2005	C. macilentum v. japonicum 600 x 40 μm L/W=15 Aizu Recreation p. Aizuwakamatsu Fukushima, 2005	C. macilentum v. japonicum 524 x 47 μm L/W=11.1 Igashira park Mooka Tochigi, 2006	C. macilentum or praelongum ? 450 x 21 μm L/W=21.4 near Tamogi-ike Nabekura highland Nagano, 2008
C. macilentum v. japonicum 480 x 37 μm L/W=13.0 Ko-numa 1 Minakami Gunma, 2008	C. macilentum v. japonicum 500 x 36 μm L/W=13.9 Near Omine-numa Minakami Gunma, 2008
var. macilentum: Cell body large; 260-800 μm long, 11-25 ╝m wide, L/W = 25-40
C. macilentum ? v. macilentum 586 x 19 μm L/W=30.8 Onnenai Kushiro marsh Hokkaido, 2005	C. macilentum v. macilentum 290 x 10.5 μm L/W=27.6 Suga-daira m. Ueda Nagano, 2006	C. macilentum v. macilentum 210 x 10.5 μm L/W=20 Naruto-Togane Sanmu Chiba, 2006	C. macilentum v. macilentum 263 x 11 μm L/W=23.9 Suiren-numa Hakkoda mountain Aomori, 2005
C. macilentum v. macilentum ? 255 x 8 μm L/W=31.9 Higashi-sano Hakuba Nagano, 2004	C. macilentum or C. aciculare ? 262 x 5.5 μm L/W=47.6 Ochiai-numa 2 Noshiro Akita, 2007	C. macilentum ?? 640 x 15 μm L/W=42.7 Kareki-numa Nikko Tochigi, 2008

Similar species -- >> C. gracile;

Please click on species name for more images.

Copyright Protist Information Server