Phylum: Charophyta   Family: Desmidiaceae

Staurastrum turgescens G. de Notaris 1867

First described and illustrated by De Notaris (1867: 51, pl. 4: 43). A triradiate species but quadriradiate cells have been recorded.
Cell dimensions: L: 28-42 µm; B: 25-37 µm.; Is: 10-12 µm.
An elusive desmid or rare occurrence, found in the benthic layer of acidic pools and bogs.

References: 
Coesel, P.F.M. & Meesters, K.J. (2013). European Flora of the Desmid Genera Staurastrum and Staurodesmus.
De Notaris, G. (1867). Elementi per lo studio delle Desmidacee Italiche. Desmidacée delle Val Itrasca.
West, W. & West, G.S. (1912). A Monograph of the British Desmidiaceae, Volume 4.