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Use of Holomorph Characters to Delimit Microascus nidicola and M. soppii sp. nov., with Notes on the Genus Pithoascus
Sean P. Abbott, Trevor C. Lumley and Lynne Sigler
Vol. 94, No. 2 (Mar. - Apr., 2002), pp. 362-369
Published by: Mycological Society of America
Stable URL: http://www.jstor.org/stable/3761813
Page Count: 8
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Several isolates of a perithecial microascaceous ascomycete having falcate ascospores and a Scopulariopsis anamorph were obtained from rotting wood in the boreal forest of Alberta, Canada. Additional isolates appeared conspecific based on anamorphic characters, but failed to produce a teleomorph. These isolates showed similarities to Microascus nidicola (type species of the genus Pithoascus) and Scopulariopsis flava. Sexual compatibility systems were investigated to establish holomorph concepts for these taxa. The teleomorph obtained in mating trials among anamorphic isolates was identical to that of self-fertile isolates. The new heterothallic species M. soppii is described. The anamorph is S. soppii. Single ascospore isolates derived from M. nidicola demonstrated homothallism and lacked an anamorph. Scopulariopsis flava (basionym Acaulium flavum) is considered a nomen dubium. Generic concepts of Pithoascus are evaluated and the genus is treated as a synonym of Microascus. Pithoascus stoveri is transferred as M. stoveri comb. nov.
Mycologia © 2002 Mycological Society of America