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Abstract
Members of the genus Acytostelium are the smallest Dictyostelids, characterized by slender acellular sorophores which support very small globose to subglobose sori. Seven species are presented as new; all were isolated since 1990, and all but one from ecologically diverse tropical environments. They are: A. digitatum, from semievergreen rain forest at Tikal, Guatemala; A. aggregatum and A. amazonicum, from tropical rain forest of the Peruvian Amazon; A. pendulum, from a Mayan milpa in Southern Belize; the largest, A. magnuphorum, from a bog in North Central Ohio; A. reticulatum, from the lower montane zone of the Loquillo Experimental Forest, Puerto Rico, and the smallest, A. minutissimum, from elfin woodland on the rim of Volcan Cacao in Costa Rica.