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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Revision of the genus Thyronectria (Hypocreales) from China.
Mycologia 2016 November
Recent collections and herbarium specimens of Thyronectria from different regions in China were examined. Using combined analyses of morphology and molecular data, we recognized eight species. Among them, Thyronectria atrobrunnea, T. orientalis, and T. sinensis are described and illustrated as new species. Thyronectria atrobrunnea is characterized by blackish brown perithecia that become cupulate when dry, and 8-spored asci containing ellipsoidal to broadly fusiform or subcylindrical ascospores that bud to form bacillar to subellipsoidal ascoconidia within the asci. Thyronectria orientalis can be easily recognized by stromata that are erumpent through the epidermis of the host, immersed or semi-immersed perithecia covered with yellowish green scurf, and ellipsoidal to subfusiform, muriform ascospores. Thyronectria sinensis on Pinus features solitary ascomata that are rarely aggregated, and 8-spored asci giving rise to subcylindrical to vermiform, multiseptate ascospores that form bacillar to allantoid ascoconidia that fill the asci. The new species and their close relatives are compared and differences between them are discussed. Thyronectria strobi is reported for the first time in China. Name changes for the previously recorded species are noted. Phylogenetic analyses inferred from 28S, ITS, RPB1, TEF1, and TUB2 hint that phenotypic characters, viz. stromata, ascospores, appendage of perithecial wall, and host specificity may carry phylogenetic information as previous papers discussed.
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