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Gamophyceae: Zygnematales: Desmidiaceae

Pleurotaenium eugeneum

Pleurotaenium 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 eugeneum (or P. cylindricum (Turner) Schmidle var. stuhlmannii (Hieronymus) Krieger or P. simplicissimum ?), cell body 790 μm long, 50 μm wide, L/W= 15.8, about 10 ? ribbon-like chlorplasts in each semicell, x 100, x 200, x 400, x 640, Uruguay, November 1999, photo by Yuuji Tsukii
scale 200 μm scale 400 μm scale 600 μm; x 100 : scale 100 μm scale 200 μm scale 300 μm; x 200
Pleurotaenium Pleurotaenium Pleurotaenium
scale 50 μm scale 100 μm scale 150 μm; x 400
Pleurotaenium Pleurotaenium Pleurotaenium Pleurotaenium
scale 31 μm scale 63 μm scale 94 μm; x 640

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