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A new species of Dictyostelium, isolated from the subalpine coniferous forests of Halla mountain, was described. The most noteworthy morphological characteristics of this new species were broad petal-like aggregates, concentrated long branches near the bases, typically clustered and delicate sorocarps. Dictyostelium floridum sp. nov. was also characterized by 1) elliptical spores with distinctive polar granules, 2) strongly tapering and rough surface of sorophores, 3) frequent occurrence of expanded conical bases, 4) the congealed slime substrate where the several bases were anchored into, 5) compound and clavata tips. It was quite sensitive to environmental conditions, particularly temperature. Macrocysts and microcysts were not observed. This species can be cultures satisfactorily in assosiation with Escherichia coli upon agar media of weak nutrient content, 0.1% lactosepeptone, under diffuse light and darkness. Optimum temperature for growth and development was about 18-22℃, below that of most other species of the family.
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