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Barbosa, Flavia Rodrigues, Luís Fernando Pascholati Gusmão, Huzefa A. Raja & Carol A. Shearer. Annulatascus apiculatus sp. nov., a new freshwater ascomycete from the semi-arid Caatinga Biome of Brazil. Mycotaxon 106: 403-407. 2008.

ABSTRACT: During an inventory of lignicolous fungi in freshwater habitats in northeastern Brazil, an interesting ascomycete belonging to the genus Annulatascus was found. This fungus differs morphologically from other species of Annulatascus and is herein described as a new species, A. apiculatus. The new species is characterized by globose, black, semi-immersed perithecial ascomata with stout black necks; cylindrical, unitunicate asci that have a relatively large bipartite, refractive apical apparatus; hyaline, 0-3 septate ascospores with short, cellular, hyaline, tapering, bipolar apiculi, and surrounded by a narrow mucilaginous sheath. The new species differs from other described Annulatascus species in ascospore dimensions and the presence of bipolar apiculi.

KEYWORDS: Annulatascaceae, diversity, systematic, submerged wood, taxonomy

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