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Gamophyceae: Zygnematales: Desmidiaceae

Pleurotaenium nodosum
(Bailey) Lundell var. nodosum

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).
Species:


Pleurotaenium nodosum (Bailey) Lundell var. nodosum ?, cell body 505 μm long, 68 μm wide, x 100, x 200, x 400, x 640, Uruguay, November 1999, photo by Yuuji Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Pleurotaenium Pleurotaenium Pleurotaenium Pleurotaenium Pleurotaenium Pleurotaenium


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