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Closterium subscoticum Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Closteriaceae

Closterium subscoticum R. Gutwinski 1902

First described and illustrated by Gutwinski (1902: 583, pl. 36: 15). Brook & Williamson (2010: p. 232, pl. 105: 1-4) note that the only essential character that separates this species from the closely related Cl. directum is that the ends in Cl. subscoticum are very slightly swollen. However, Cl. directum has girdle bands and noticeable striae, whereas Cl. subscoticum has false girdle bands and barely visible, or lacking, striae.
Cell dimensions: L: 180-350 µm; B: 6.5-12.6 µm; Ap: 5.0-8.0; L/B: 17-29.
A rare species found in slightly to more pronounced acidic condition such as peaty pools, bogs and loch-margins.

References: 
Brook, A.J. & Williamson, D.B. (2010) A Monograph on some British Desmids.
Coesel, P.F.M. & Meesters, K.J. (2023 second edition) Desmids of the Lowlands.
Gutwinski, R. (1902) De algis a Dre Raciborski in insula Java collectis.

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