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).

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

Similar species -->> C. binum;

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