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Euastrum dubium </em>var.<em> ornatum Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiaceae

Euastrum dubium var. ornatum J. Woloszynska 1919

Very similar to the nominate variety but with more pronounced ornamentation and with a deeper apical incision. The nominate variety would seem to be slightly larger and occupy a different, more acidic habitat. The var. ornatum has only been found in atmophytic habitat in the Outer Hebrides.
Cell dimensions: L: 29–37 µm, B: 19–26 µm, B-apex: 10.3-14.2 µm; Is: 5.1–7.2 µm, Th: 14.1–16.1, L/B = 1.43–1.54. Elsewhere in Europe, populations with smaller dimensions have been found with no overlap: L: 22–25 µm, B: 16–19 µm, Is: 5.2–5.9 µm. L/B: 1.35–1.46.

References: 
Ruzicka, J. (1981) Die Desmidiaceen Mitteleuropas, Volume 1, Part 2.
Woloszynska, J. (1919) II. Przyczynek do znajomosci glonow Litwy.

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