Species: 250-(396-576)-790 μm long, 25-(33-84) μm wide; cell body large, slightly curved; both termini tapered; pyrenoids 7-15 in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977). Cell body slightly curved, gradually attenuated toward the truncated ends, which somewhat recurved due to the covexity of the inner margin near the ends; inner margin straight or slightly concave, outer margin convex, 300-500 μm long, 32-50 μm wide, L/W=9-14; cell wall smooth and colorless or sometimes delicately striated and yellowish-brown in color; chloroplasts with ridges containing 7-11 pyrenoids in central row (Photomicrographs of the Freshwater Algae, vol. 1, 1984).

Google Image Search

Cell body long (388-915 μm), central region nearly straight; L/W=15-33
var. elongatum 892 x 40 μm L/W=22.3 Doman Green P. Toda Saitama, 2004	var. elongatum 860 x 41 μm L/W=21.0 Doman Green P. Toda Saitama, 2004	var. elongatum 772 x 38 μm L/W=20.3 Aizu Recreation p. Aizuwakamatsu Fukushima, 2005	var. elongatum 636 x 34 μm L/W=18.7 Nogyo Fureai p. Toride Ibaraki, 2008
var. elongatum 720 x 40 μm L/W=18 Junichogata s.p. Himi Toyama, 2006	var. elongatum 654 x 30 μm L/W=21.8 Naruto-Togane Sanmu Chiba, 2006	var. elongatum 635 x 33 μm 388 x 19 μm L/W=20, 19 Japan, 1998	var. elongatum 620 x 27 μm L/W=23.0 Okubo Ryoke Akigase park Saitama, 2005
var. elongatum 620 x 27 μm L/W=23.0 Jionji-shinsui-koen Iwatsuki Saitama, 2006	var. elongatum 550 x 38 μm L/W=14.5 Imou bog Toyohashi Aichi, 2004	var. elongatum 303 x 20 μm L/W=15 Motono Chiba, 2003	var. elongatum 470 x 23.5 μm L/W=20 Higusa-numa Hikari Chiba, 2003
var. elongatum μm L/W= Kashiwa VMP Kashiwa Chiba, 2008	var. elongatum 490 x 28 μm L/W=17.5 Yamato Kanagawa, 2003	var. elongatum 410 x 18 μm L/W=22.8 Michi-no-eki Tsukiyono Gunma, 2003	C. acerosum ? 480 μm L/W=24 bands present Japan, 1998
Cell body less than 20 μm in width
C. acerosum ? 400 x 20 μm L/W=20 Kosugi Toyama, 2002	C. acerosum ? 388 x 16 μm L/W=24 Higashi-Urawa Saitama, 2001	C. acerosum ? 390 x 15 μm L/W=26 Kosugi Toyama, 2002	C. acerosum ? 305 x 18 μm L/W=17 Furu-tone river Kasukabe Saitama, 2004
C. acerosum 270 x 18 μm L/W=15 Kijioka Castle R. Honjo (Kodama) Saitama, 2006

Please click on species name for more images.

Copyright Protist Information Server