Abstract
The spore populations of vesicular-arbuscular (VA) mycorrhizal fungi at four sagebrush-grassland sites in Wyoming were examined, characterized, and quantified. The sampled soils contained 232–696 spores per 100 g dry soil and three to six species of VA mycorrhizal fungi (Glomus fasciculatus, G. macrocarpus, G. microcarpus, G. mosseae, Entrophospora infrequens, and an unidentified form). Community composition and relative prominence (frequency, density) of the six species were related both to geographic location of the site and abiotic factors and to identity of the plant symbiont. Environmental influence on spore populations is discussed.
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