Cosmarium quadratum Ralfs
Reference: Coesel & Meesters 2007
Compare with: Cosmarium f. quadratum; Cosmarium cucumis var. magnum
Reference: Coesel & Meesters 2007
Compare with: Cosmarium f. quadratum; Cosmarium cucumis var. magnum
Remarks: Cosmarium quadratum has a variable morphology and several forms have been described as separate taxa.
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