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A taxonomic survey of oedogonium (oedogoniales, chlorophyta) in the South Island and Chatham Islands, New Zealand

Abstract A survey of freshwater habitats, mainly streams and rivers, from Nelson, Canterbury, Westland, Southland, and the Chatham Islands revealed 20 taxa of Oedogonium that could be identified below genus level. Oedogonium was found in 46% of all samples examined. Fertile material appeared in 29% of samples containing the genus; however, it was much more common (54%) in samples from Canterbury than from other regions (12–20%). Two new species and three new varieties are proposed: O. braunii var. grande, O. cyathigerum var. laevis, O. subdissimile var. submasculum, O. southlandiae, and O. didymum. In identification, structure of male filaments was often found to be as important as the more commonly described female structures. Only five previously recorded species of Oedogonium in New Zealand have included any description of male material. Several species (including O. cyathigerum var. laevis and O. subdissimile var. submasculum) displayed subtle differences from Northern Hemisphere descriptions when structures of male material were compared.