A new endomycorrhizal species, Glomus epigaeus, produces abundant chlamydospores in sporocarps on the soil surface. This species has been maintained for more than 1 year in pot culture on various hosts and produces 8–15 sporocarps monthly from each pot. A simple technique of shaking sporocarps in water with broken glass chips is described for the separation of spores from sporocarps.The epigeous habit, narrow, thin-walled, inserted hyphal attachment, and bright yellow to yellow–brown wall color in transmitted light separate G. epigaeus from Glomus macrocarpus, which normally does not fruit epigeously and has a much broader, thick-walled, noninserted hyphal attachment and brown wall color in transmitted light.
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Daniels et al. (1979) studied this question.