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Abstract
Two new species of Dictyostelium, D. dimigraformum and D. laterosorum, and a new species of Acytostelium, A. ellipticum, are described. All three species were first isolated from the surface humus layer of tropical forest soils on the island of Trinidad, W.I D. dimigraformum is distinguished from other species of the genus by its ability to form both stalkless and stalked migrating pseudoplasmodia. D. laterosorum is a member of the crampon-based Dictyostelia. It differs from other members of this group in bearing lateral, sessile sori along the terminal half of the sorophore. A. ellipticum is the second species in the genus Acytostelium to be described. It is distinguished from A. leptosomum by its elliptical spores, pattern of aggregation and development, and smaller size.
- Accepted:
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