Revision of Glomeromycetes with entrophosporoid and glomoid spore formation with three new genera

Abstract

New ribosomal gene analyses reveal that Entrophospora is non-monophyletic and its type species E. infrequens closely related to Claroideoglomus species, which supports transfer of the Entrophosporaceae from Diversisporales to Glomerales as well as the 'ancestral' Claroideoglomus spp. to Albahypha gen. nov. Entrophospora baltica, supported as a separate clade within Diversisporales, is designated as type species for the new monospecific Sacculosporaceae . Entrophospora nevadensis, phylogenetically close to Diversipora spp. and Otospora bareae, is transferred to Tricispora gen. nov. ( Diversiporaceae ). Entrophospora , Sacculospora, and Tricispora are morphologically distinguished by spore wall structure, pattern of the two spore pore closures proximal and distal to the sporiferous saccule, and relative spore and sporiferous saccule sizes. The shape of the white hyphae subtending the spore base separates Albahypha spp. from Claroideoglomus spp.