Abstract
Abstract The morphology, reproduction and taxonomy of a unicellular, epiphytic green alga, Characiochloris sasae Nozaki sp. nov., collected in Japan, were studied using clonal cultures. This taxon is distinguished from other species of Characiochloris by its unique vegetative cells, which are elongate spindle-shaped with a blunt, papilla-like distal end. Under optimal laboratory conditions, cells usually produce 32, 64 or 128 biflagellate zoospores. Zoospores are elongate-ovoid in shape and have two equal flagella somewhat longer than cell length. The stigma is large, measuring 1/5–1/3 of the cell length. After liberation, each zoospore attaches to the substratum by its anterior end and develops into a vegetative cell. Aplanospore formation occurs in older cultures. A single spherical, smooth-walled aplanospore usually develops within its parental cell wall. Germination of aplanospores has been observed for the first time in the genus Characiochloris, following dark treatment. The germinating aplanospore ...
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