AXILOSPHAERA AND HETEROTETRACYSTIS, NEW CHLOROSPHAERACEAN GENERA FROM TENNESSEE SOIL12

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Abstract
Two new chlorosphaeracean genera were isolated into axenic culture from soil collected in cedar glades in Cedars of Lebanon State Forest, Wilson County, Tennessee. The distinguishing characteristics of the new monotypic genus Axilosphaera include an axile (asymmetric) ckloroplast with at least 1 pyrenoid and Chlamydomonas-type (walled) zoospores. A. vegetata is the type species. Reproduction is by dissociation of daughter cells following vegetative cell division, by zoospores, and by aplanospores. The new polytypic genus Heterotetracystis, comprising 3 species, H. akinetos, H. macrogranulosa, and H. intermedia, is characterized by a parietal chloroplast with at least 1 pyrenoid and walled zoospores with flagella of unequal length. Reproduction is by dissociation of daughter cells following vegetative cell division and by zoospores. H. akinetos is designated as the type species.