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Abstract
Descriptions are provided of cultured isolates of four species of chlorophyte microalgae which would traditionally be assigned to the Chaetophoraceae, Leptosiroideae (sensu Bourrelly, 1990). Light microscope observations are supplemented by electron microscopy, particularly of pyrenoid features. Three new species are described: Coccobotrys mucosus sp. nov., Dilabifilum prostratum sp. nov. and Desmococcus endolithicus sp. nov. Desmococcus olivaceus is a new record for Antarctica. Diagnostic features of the new species include extensive gelatinisation of cell walls in old cultures of C. mucosus, growth of a well-developed pseudoparenchymatous prostrate system in liquid cultures of D. prostratum, and production of quadriflagellate zoospores by D. endolithicus which is a new observation for this genus. Unusual and contrasting ultrastructural features of the pyrenoid are described for D. prostratum and the Desmococcus species. The former is traversed by appressed pairs of thylakoids coated with pyrenoglobuli; the latter is traversed by single thylakoids with pyrenoglobuli surrounding the pyrenoid matrix.
