Abstract
Previous antarctic records of Pseudococcomyxa simplex are summarized and, together with new records, the alga is shown to have a circumpolar distribution in terrestrial habitats. It has been encountered over a latitudinal range of 54° to 77°S in sub-, maritime and coastal continental Antarctica, from sea-level to an altitude of 3600 m. The alga has been observed in grassland soils, as an epiphyte on a variety of mosses, in lithosols, in volcanic fumarolic soils and as a chasmoendolithophyte. A previous misidentification of this alga as Monodus subterraneus Boye Pet. is corrected. The morphology of antarctic specimens is deccribed using light and electron microscopy, the latter for the first time with this alga. Antarctic and european specimens are shown to be almost identical. It is concluded that culture studies of wide-ranging samples from antarctic terrestrial habitats will probably reveal additional cosmopolitan species.
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