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Cosmocladium pulchellum Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiaceae

Cosmocladium pulchellum L.A. de Brébisson 1856

Cells small, longer than broad, sinus fairly deep and opening widely. Semicells in side-view orbicular, chloroplast axile with a single pyrenoid.
Cell dimensions: L: 12-24 µm; B: 11-16 µm; Is: 4-5 µm; Th: 7-9 µm.
First described and illustrated by Brébisson (1856: 133, pl. 1: 20). He noted that the cells are attached by twin filamentous threads in a tree-like formation and attached to a substrate such as an alga. Later authors, including West, West & Carter (1923: 200: pl. 158: 11-12), offer a more flexible view. Cells are attached with twin-threads (not always easy to see) and free-floating. A rare species: interestingly, the Wests specifically mention Harris in the Outer Hebrides as a site.

References: 
Brébisson, L. A. de (1856) Liste des Desmidiées, observées en Basse-Normandie.
Prescott, W.G. et al. (2001 reprint) A Synopsis of North American Desmids. Part II, Desmidiaceae: Placodermae, Section 3.
West, W., West, G.S. & Carter, N. (1923) A Monograph of the British Desmidiaceae, Volume 5.

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