Phylum: Charophyta Family: Desmidiaceae
Cosmarium rostafinskii Gutwinski 1890
First described by Gutwinski (1890, p. 67 [emended 1892, p. 41, pl. 1: 15]). Later, West & West (1908, p. 251, pl. 89: 8-10) made it a variety of C. speciosum suggesting it differs so little that it is scarcely justifiable to regard it as specifically distinct. They give a lower range of sizes as well as taking into account Gutwinski’s measurements and illustrate a cell (l.c. pl. 89: 9) with these small dimensions. Kouwets (in manuscript) refers to this cell and has bracketed the lower sizes suggesting it might represent a different species. Interestingly, The Harris find reflects these lower measurements. A rare desmid found in atmophytic habitats such as ephemeral pools and with moss on wet rocks.
Gutwinski, R. (1890) Zur Wahrung der Priorität.
Gutwinski, R. (1892) Flora glonów okolic Lwowa. (Flora algarum agri Leopoliensis).
West, W. & West, G.S. (1908) A Monograph of the British Desmidiaceae, Volume 3.
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium.