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Gamophyceae: Zygnematales: Desmidiaceae

Pleurotaenium nodosum
(Bailey) Lundell var. borgei Grömnblad

Pleurotaenium nodosum Genus: Cell body long cylindroid; a slight constriction at center; cross section of the semicells spherical, slightly swell at the center but without a folded structure as Docidium; slightly tapered toward both ends, which are truncated and smooth or surrounded by granules or various small structures; laterally straight or wavy, with spiny projections in some species; 2-10 ribbon-like chloroplasts in each semicell; with many pyrenoids; a vacuole containing active granules at both ends same as in Closterium; cell wall mostly dotted, but with spines or other patterns in some species (Illustrations of The Japanese Fresh-water Algae, 1977).

Pleurotaenium nodosum var. borgei Grönblad, cell body 350 μm long, 48 μm wide, L/W=7.3, x 200, x 400, x 640, Tashirodaira marsh, Hakkoda mountain, Aomori city, Aomori Pref., Japan, July 17, 2005 by Y. Tsukii
scale 100 μm scale 200 μm scale 300 μm; x 200 : scale 50 μm scale 100 μm scale 150 μm; x 400
Pleurotaenium nodosum Pleurotaenium nodosum Pleurotaenium nodosum Pleurotaenium nodosum Pleurotaenium nodosum

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