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Bilanenko, E., D. Sorokin, M. Ivanova & M. Kozlova. Heleococcum alkalinum, a new alkali-tolerant ascomycete from saline soda soils. Mycotaxon 91: 497-507. 2005.

ABSTRACT: A new ascomycete was isolated from saline soda soils in Central Asia (Kunkur steppe, Kulunda steppe of South Siberia, N-E Mongolia), and Africa (Kenya). It is described as Heleococcum alkalinum sp. nov. The species produces dark brown cleistothecial ascomata, where asci scattered disorderly, the ascus wall being evanescent at maturity. Ascospores are bicellular, brown, thick-walled, without any ornamentation and not constricted at the septum. The anamorph is placed in Acremonium sect. Nectrioidea. Heleococcum alkalinum was isolated on alkaline agar (pH 10-10.5) with carboxymethyl cellulose (CMC). It was a dominant species in samples of soda soils with pH >10 and relatively high salinity. Its radial growth rate was almost equal within the range of pH 6.7-10.8, demonstrating an alkali-tolerant adaptation.

KEYWORDS: Bionectriaceae, Hypocreales, ascomycetes

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