Genus: Cell body ellipsoidal or short cylindrical; chloroplasts plate-like.
Species: Cell body cylindrical, 22-38 μm long, 11-20 μm wide, both ends rounded, a single plate-like chloroplast present, margins dented (Illustrations of The Japanese Fresh-water Algae, 1977) .

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M. macrococcum 24-40 x 16 μm Karakemi marsh Yasaka Nagano, 2005	M. macrococcum 23-42 x 18 μm Karakemi marsh Yasaka Nagano, 2006	M. macrococcum 38-44 x 21 μm Tanohara marsh Shiga highland Nagano, 2004	M. macrococcum 23-43 x 13-18 μm Shijuhachi-ike Shiga highland Nagano, 2006
M. macrococcum 28 x 13 μm Ukishima marsh Tsugaike highland Nagano, 2005	M. macrococcum 25 x 12 μm Kamino-tanbo Tsugaike highland Nagano, 2006	M. macrococcum 25-36 x 20-22 μm Shimo-Kenashitai 5 Hakkoda mountain Aomori, 2006	M. macrococcum 28.5 x 14 μm near Iroha-numa Zao mountain Yamagata, 2006
M. macrococcum 33-40 x 17 μm Ohnuma Nasu-shiobara Tochigi, 2007	M. macrococcum μm Kareki-numa m. Nikko Tochigi, 2008.9	M. macrococcum ? μm Ayamedaira 3 Katashina Gunma, 2007

Similar genus -->> Roya; Netrium; Penium;

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