Abstract
Annulatascus nilensis sp. nov., from freshwater habitats in Egypt, is described, illustrated and compared to other species in the genus. Phylogenetic analyses of its LSU rDNA sequence with similar fungi placed the new species in the genus Annulatascus (Annulatascaceae, Sordariomycetidae incertae sedis). Annulatascus nilensis is characterized by immersed ascomata with an ascomatal neck oriented horizontally to the substrate surface, asci with a long, narrow stalk and massive bipartite apical ring, and 5-11-septate, hyaline ascospores surrounded by a large irregular, granular sheath that is not seen in water.
Highlights
The generic name Annulatascus was introduced by Hyde (1992) to accommodate two freshwater fungi, A. velatisporus and A. bipolaris, which were collected from submerged wood in Australia
During an ongoing investigation of freshwater fungi on wood submerged in the River Nile in Egypt, we discovered a previously unknown species of Annulatascus which is described and illustrated here, and compared to other species in the genus using morphological and molecular data
Phylogenetic analyses of the LSU rDNA sequence of the new fungus placed the new fungus in the same clade as the type species of the genus ( Annulatascus velatisporus) and A. hongkongensis
Summary
The generic name Annulatascus was introduced by Hyde (1992) to accommodate two freshwater fungi, A. velatisporus (the type species) and A. bipolaris, which were collected from submerged wood in Australia. Annulatascus species are characterized by dark, immersed or superficial perithecioid ascomata; wide, tapering paraphyses; long cylindrical asci with a relatively massive refractive bipartite apical ring; and hyaline, fusiform, sheathed or appendaged ascospores. Phylogenetic analyses of the LSU rDNA sequence of the new fungus placed the new fungus in the same clade as the type species of the genus ( Annulatascus velatisporus) and A. hongkongensis.
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