Description: Cells a little longer than broad, moderately constricted. Breadth of isthmus about 2/3 of cell breadth. Sinus open from an acute-angled apex. Semicells in frontal view elliptical to semicircular in outline, in apical view broadly elliptical. Cell wall smooth, markedly porous. Cell length 55–60um, cell breadth 45–52um, cell thicness circa 33um, breadth of isthmus 28–34um. (Coesel & Dingley 2005)

State distribution in Australia, based on available literature

Presumably, C. porosum has been recorded from Australia before under the name of C. lundellii Delponte, in particular its var. corruptum (W.B.Turner) W. et G.S.West, see Borge (1911), Scott & Prescott (1958) and Ling & Tyler (2000). It is quite obvious, however, that the taxon in question has nothing to do with C. lundellii, a species characterized by a substantially deeper and almost closed sinus. (Coesel & Dingley 2005)

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