Section [Cristatae]: Cell surface granulated, gnarled or spiny; semicells half circle, half ellipsoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body medium in size, broadly elliptical, 40-(45-48)-53 μm long, 32-(37-40)-44 μm wide, isthmus 14-(16-18)-21 μm wide; semicells semicircular in shape, basal corners right-angled, 6 lines of apically-truncated warts (about 14 warts in each line) present along their margins; 2 lines of warts or granules (upper 3 & lower 4) present at the center of the semicells (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. binum;
C. quadrifarium
f. hexasticha
55 x 41 μm
Kenashitai
Hakkoda mountain
Aomori, 2005
C. quadrifarium
f. hexasticha
55 x 43 μm
Tashirodaira m.6
Hakkoda mountain
Aomori, 2006
C. quadrifarium
f. hexasticha
53 x 42 μm
Sensho-ga-hara 8
Shizukuishi
Iwate, 2007
C. quadrifarium
f. hexasticha
μm
near Hachimantai mt.
Hachimantai
Iwate, 2007
C. quadrifarium
f. hexasticha
x 41 μm
Mida-ga-hara
Gassan
Yamagata, 2005
C. quadrifarium
f. hexasticha
50 x 39 μm
Mida-ga-hara
Gassan (mt.)
Yamagata, 2006
C. quadrifarium
f. hexasticha
50 x 32 μm
Iroha-numa 3
Zao mountain
Yamagata, 2006
C. quadrifarium
f. hexasticha
48 x 36 μm
Numappara marsh
Kuroiso
Tochigi, 2003
C. quadrifarium
f. hexasticha
μm
Numappara m.4
Kuroiso
Tochigi, 2007
C. quadrifarium
f. hexasticha
μm
Numappara m.1
Kuroiso
Tochigi, 2007
C. quadrifarium
f. hexasticha
μm
Motoyu m.1
Nikko
Tochigi, 2008
C. quadrifarium
f. hexasticha
51 x 40 μm
Oze-ga-hara
Katashina
Gunma, 2006
C. quadrifarium
f. hexasticha
μm
Yokotashiro 1
Katashina
Gunma, 2007
C. quadrifarium
f. hexasticha
46 x 33 μm
Omine-numa
Minakami
Gunma, 2006
C. quadrifarium
f. hexasticha
50 x 39 μm
Omine-numa
Minakami
Gunma, 2007
C. quadrifarium
f. hexasticha
52 x 41 μm
Shimo-muneoka
Shiki
Saitama, 2004
C. quadrifarium
f. hexasticha
56 x 45 μm
Shijuhachi-ike
Shiga highland
Nagano, 2005
C. quadrifarium
f. hexasticha
μm
Shijuhachi-ike
Shiga highland
Nagano, 2008
C. quadrifarium
f. hexasticha
54 x 40 μm
50 x 41 μm
Shimo-no-koike
Shiga highland
Nagano, 2004
C. quadrifarium
f. hexasticha
51 x 40 μm
Shimo-no-koike
Shiga highland
Nagano, 2005
C. quadrifarium
f. hexasticha
51 x 40 μm
Tanohara marsh
Shiga highland
Nagano, 2006
C. quadrifarium
f. hexasticha
60 x 47 μm
Tanohara marsh
Shiga highland
Nagano, 2007
C. quadrifarium
f. hexasticha
49 x 38 μm
Ukishima marsh
Tsugaike highland
Nagano, 2005
C. quadrifarium
f. hexasticha
50 x 40 μm
Ukishima marsh
Tsugaike highland
Nagano, 2006
C. quadrifarium
f. hexasticha
49 x 36 μm
Maimeno-ike
Norikura highland
Nagano, 2006
C. quadrifarium
f. hexasticha
55 x 43 μm
Karakemi marsh
Omachi
Nagano, 2006
C. quadrifarium
f. hexasticha
μm
Midagahara
Tate-yama
Toyama, 2006
C. quadrifarium
f. hexasticha
μm
n. Yamakado m.
Nishi-Azai
Shiga, 2008
C. quadrifarium ?
f. hexasticha
52 x 40 μm
Kodanuki marsh
Fujinomiya
Shizuoka, 2005
C. quadrifarium ?
f. hexasticha
52x36, 51x37 μm
Kodanuki marsh
Fujinomiya
Shizuoka, 2006
C. quadrifarium
small var. ?
41-42 x 37-38 μm
Koigakubo marsh
Tessei-cho
Okayama, 2004
C. quadrifarium
f. hexasticha
μm
Kashibaru m.II
Karatsu
Saga, 2008