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Atradidymella muscivora gen. et sp. nov. (Pleosporales) and Its Anamorph Phoma muscivora sp. nov.: A New Pleomorphic Pathogen of Boreal Bryophytes

Marie L. Davey and Randolph S. Currah
American Journal of Botany
Vol. 96, No. 7 (Jul., 2009), pp. 1281-1288
Stable URL: http://www.jstor.org/stable/27733461
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Atradidymella muscivora gen. et sp. nov. (Pleosporales) and Its Anamorph Phoma muscivora sp. nov.: A New Pleomorphic Pathogen of Boreal Bryophytes
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Abstract

During a survey of bryophilous fungi from boreal and montane habitats, 12 isolates of a hitherto unknown plant pathogenic member of the Pleosporales were recovered from Aulacomnium palustre, Hylocomium splendens, and Polytrichum juniperinum, and described as Atradidymella muscivora gen. et sp. nov. Atradidymella is characterized by minute, unilocular, setose pseudothecia having 2–3 wall layers; brown, fusiform, 1-septate ascospores; and a Phoma anamorph. The genus is distinguished from all other pleosporalean genera with brown, fusiform ascospores on the basis of ascospore and pseudothecium morphology and a highly reduced stroma that is localized within a single host cell. Atradidymella muscivora is distinguished by its minute pseudothecia (<115 μm) and ascospores that are slightly allantoid and constricted at the septum with the upper cell often wider than the lower. Its anamorph, Phoma muscivora sp. nov., is morphologically distinguishable from P. herbarum in having smaller conidia. Parsimony analysis of the ITS rDNA region indicates A. muscivora has affinities to the Phoma-Ascochyta-Didymella clade that is sister to the Phaeosphaeriaceae within the Pleosporales.

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