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Abstract
A new heteropolar nostocalean cyanoprokaryote Microchaete robinsonii sp.nov. is described from the benthic periphytic assemblage found on stones in the eutrophic Souris River near Dunclody in southwestern Manitoba, Canada. This species belongs to the group of species with narrow trichomes attenuated to the apex but never forming hairs. The morphology of this species is described and its taxonomic position within the genus Microchaete is presented. It differs from other Microchaete species by morphology of filaments, trichomes and sheaths, dimensions, mode of disintegration of trichomes into hormogonia, and its ecology. The morphological features of heteropolar nostocalean genera useful in generic delimitation are reviewed and discussed. Key words: cyanoprokaryotes, Microchaete, new species, rivers, periphyton, Canada.
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