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Polysphondylium multicystogenum sp. nov., a new dictyostelid species from Sierra Leone, West Africa

     Department of Botany, National Museum of Nature and Science, Amakubo 4-1-1, Tsukuba, Ibaraki 305-0005, Japan

Polysphondylium multicystogenum, a new heterothallic species of dictyostelids, is described based on three isolates collected from soils in Sierra Leone, West Africa. This species is characterized by sorophores with a combination of clavate base and ovoid to oblong tip cell, smaller spores and abundant microcyst production under the usual culture conditions for sorocarp formation at 20 C. This is the first report of Polysphondylium producing such abundant microcysts.

Key words: dictyostelid cellular slime molds, mating, microcyst, Polysphondylium multicystogenum, species complex, taxonomy