Family: Unicells or cells loosely attached forming hyphae; cell body varied in shape, a constriction at the center in most species; cell walls consisting of two or more parts, with small pores and various ornaments (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Cell body long cylindroid, with a slight constriction at the center, where a folded structure present; both ends truncated, smooth; chloroplasts consist of a central rod and irregularly arranged laminae; about 6-8 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).

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D. undulatum cell 174 x 17 μm Kenashitai Hakkoda mountain Aomori, 2005	D. undulatum cell 202 x 17 μm Kenashitai Hakkoda mountain Aomori, 2006	D. undulatum cell 178 x 14 μm Sukawa highland Kurikoma mt. Akita, 2007	D. undulatum cell 178 x 14 μm Ohyachi 2 Hachimantai Akita, 2007
D. undulatum cell 157 x 15 μm Hachiman-numa Hachimantai Iwate, 2007	D. undulatum cell x 15 μm Sensho-ga-hara Shizukuishi Iwate, 2007	D. undulatum cell 150 x 15 μm Mida-ga-hara Gassan (mt.) Yamagata, 2005	D. undulatum 174-230 x 14 μm Mida-ga-hara Gassan (mt.) Yamagata, 2006
D. undulatum cell 180 x 17 μm Shimo-no-koike Shiga highland Nagano, 2004	D. undulatum cell 180 x 16 μm Shimo-no-koike Shiga highland Nagano, 2004	D. undulatum cell 225 x 14 μm Watasuge marsh Tsugaike highland Nagano, 2006	D. undulatum cell 94-108 x 15 μm Ushidome-ike Norikura highland Nagano, 2005
D. undulatum cell 106 x 15 μm Ushidome-ike Norikura highland Nagano, 2006	D. undulatum 222 x 14 μm Midagahara Tate-yama (mt.) Toyama, 2006	D. undulatum μm Mitsuishi m.2 Hachimantai Iwate, 2008	D. undulatum cell μm Japan, 1998

Similar species ->> Pleurotaenium kayei; P. nodosum; Triploceras;

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