Phylum: Charophyta   Family: Desmidiaceae

Micrasterias thomasiana var. notata (O. Nordstedt) R. Grönblad 1920

First described by Nordstedt (1888: 155) as M. denticulata var. notata. It was later moved by Grönblad (1920: 38) to M. thomasiana var. notata. Differs from the nominate variety by having the cell sculpture much reduced. It then needs to be carefully compared with Micrasterias denticulata.
Cell dimensions: L: 200-260 µm; B: 170-230 µm; Is: 21-31 µm; L/B: 1.10-1.30.
Found in acidic mesotrophic waters such as moorland pools and abandoned peat-cuttings, but infrequently recorded.

References: 
Coesel, P.F.M. & Meesters, K.J. (2023 second edition) Desmids of the Lowlands.
Grönblad, R. (1920) Finnländische Desmidiaceen aus Keuru.
Nordstedt, O. (1887) Algologiska småsker ... 4. Utdrag ur ett arbete öfver de af D:r. S. Berggren på Nya Sealand och i Australien samlade sötvattebsakgerna.
Ruzicka, J. (1981) Die Desmidiaceen Mitteleuropas, Volume 1, Part 2.
West, W. & West, G.S. (1905) A Monograph of the British Desmidiaceae, Volume 2.