Micrasterias rotata Ralfs

Micrasterias rotata Ralfs

( Fig. 6A View FIG )

The British Desmidieae: 71 ( Ralfs 1848).

Eutomia rotata (Greville) Harvey , A manual of the British algae: 187 ( Harvey 1841). — Micrasterias rotata f. granulata West , Journal of the Linnean Society of London, Botany 29: 134 ( West 1892). — Micrasterias rotata f. evoluta W. B. Turner, Kungliga Svenska Vetenskaps-Akademiens Handlingar 25 (5): 167 ( Turner 1893). — Micrasterias rotata var. evoluta (W. B. Turner) Willi Krieger, Die Desmidiaceen Europas mit Berücksichtigung der aussereuropäischen Arten. (Dr. Rabenhorst’s Kryptogamen-Flora von Deutschland, Österreich und der Schweiz: 13). Vol. 2: 102 ( Krieger 1939).

DISTRIBUTION. — Cosmopolitan. Amazon Basin: Grönblad (1945); Thomasson (1971); Uherkovich (1976, 1981); Martins (1986b), Lopes & Bicudo (2003); Melo et al. (2005, 2009); Cunha de et al. (2013); Feitosa et al. (2015). Western Amazonia (lowlands): Duque & Donato (1993); Duque & Núñez-Avellaneda (2000); Núñez-Avellaneda (2008).

DESCRIPTION

Cells 323.8-329.5 µm long, 313.6-321.7 µm wide; isthmus 44.2-44.5 µm; apex: 65.0-71.8µm; cells are as long as they are wide. Large cells with circular outline, deep median constriction; hyaline cell wall, finely punctuated. Semicells five-lobed, apical lobe projecting slightly beyond the lateral lobes, apical lobe angles laterally projecting, two-denticulated; lateral, and basal lobes in a “V” shape, similar between them.