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ABSTRACT
A lectotype for Glomus microcarpum, chosen from among the original materials collected by the Tulasnes, is described and illustrated. The lectotypes of G. microcarpum, G. fasciculatum, and G. macrocarpum, are compared morphologically and found to differ distinctly. The features of sporocarp anatomy and chlamydospore morphology considered in this comparison are: presence or absence of a peridium, a gleba, and a clustered arrangement of the spores within the sporocarp, and spore size range, shape, and number of wall layers.