Order & Family: Floating unicells or a colony embedded in a matrix; no differentiation of apical and base structures; only one family.
Genus: (Illustrations of The Japanese Fresh-water Algae, 1977).

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R. lineare 7-9 x 2 μm Watasuge marsh Tsugaike highland Nagano, 2005	R. lineare 12 x 2.5 μm J. Skunk Cabbage m. Tsugaike highland Nagano, 2006	R. lineare 7-12 x 2.5 μm Iroha-numa Zao mountain Yamagata, 2005	R. lineare 14 x 2 μm Iroha-numa Zao mountain Yamagata, 2006
R. lineare 10 x 1.8 μm Tanohara marsh Shiga highland Nagano, 2006	R. lineare ? 9 x 2.5 μm Mida-ga-hara 9 Gassan Yamagata, 2006	R. lineare ? 9 x 2.5 μm Kama-ike Sugadaira Fukushima, 2006	R. lineare ? 7-9 x 2 μm Ushidome-ike Norikura highland Nagano, 2005
R. lineare 13 x 2.5 μm Ayamedaira 4 Katashina Gunma, 2007	R. lineare μm Mitsuishi m.2 Hachimantai Iwate, 2008	R. lineare μm Chigo-ike m.1 Shiga highland Nagano, 2008

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