Psilosiphon scoparium gen. et sp. nov. (Lemaneaceae), a new red alga from south-eastern Australian streams

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Abstract
Psilosiphon scoparium gen. et sp. nov. forms clumps of rigid, cylindrical, anodulate, little-branched thalli in two widely separated oligotrophic streams in south-eastern Australia. Although similar in early vegetative development to Lemanea, it is anatomically distinct from any known freshwater or marinered alga. Plants are uniaxial, with profuse, loosely arranged, adventitious (medullary) filaments derived from the basal cells of determinate laterals, and an outer cortex of cells nearly uniform in size and shape from the inner to outer layers. Reproduction is by adventitious plantlets from cortical filaments and by conversion of prostrate uniseriate filaments into erect axes.