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Goto, Bruno Tomio, Leonor Costa Maia & Fritz Oehl. Ambispora brasiliensis, a new ornamented species in the arbuscular mycorrhiza-forming Glomeromycetes. Mycotaxon 105: 11-18. 2008.

ABSTRACT: A new dimorphic fungal species in the arbuscular mycorrhiza-forming Glomeromycetes was found in the Cerrado biome in Minas Gerais (Southeast Brazil) and is here described from acaulosporoid glomerospores under the epithet Ambispora brasiliensis. Glomoid glomerospores of this species were found only once, connected to a germinating acaulosporoid glomerospore. The acaulosporoid glomerospores are formed on a pedicel branching from the neck of a sporiferous saccule. They are hyaline to pale yellow in color, globose, 62-95 µm in diameter, to subglobose to oval, 59-88 × 69-100(-118) µm, and with three spore walls. Crowded irregular pustules, 2.4-7.0(-10.0) µm high and 4.2-9.8(-15.0) µm wide, are formed on the surface of the outer wall. The glomoid glomerospores are hyaline to subhyaline, globose, 25-30 µm in diameter, and have a bi-layered spore wall without ornamentation. The acaulosporoid glomerospores of the new fungus can easily be distinguished from all other species in the genus Ambispora by spore size and by the distinct pustulate ornamentation.

KEYWORDS: Glomeromycota, Ambisporaceae, bimorphic, germination

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