Two new wood-decaying fungal species on Arundo donax from Guangxi, southern China
Wood-decaying fungi are among the most important groups of macrofungi with crucial ecological roles and economic value. In this study, phylogenies were reconstructed using ITS + nLSU genetic loci of Phlebiopsis, and ITS + nLSU + tef1 genetic loci of Sicyoideibasidia. Two new wood-decaying fungal species on Arundo donax, Phlebiopsis arundinacea sp. nov. and Sicyoideibasidia luteocystidia sp. nov. are illustrated and described from Guangxi, southern China. Phlebiopsis arundinacea is characterized by resupinate, membranaceous basidiomata with smooth and grayish brown hymenial surface when fresh, a pseudodimitic hyphal system with simple-septate generative hyphae, the presence of brown skeletocystidia and lamprocystidia, and subcylindrical to oblong-ellipsoid basidiospores. Sicyoideibasidia luteocystidia is characterized by resupinate, membranaceous basidiomata with smooth and white to cream hymenial surface when fresh, a monomitic hyphal system bearing clamp connections on generative hyphae, the presence of fusiform to subulate and slight yellow clavate to capitate cystidia, and ellipsoid, thick-walled basidiospores. The phylogenetic analyses showed that P. arundinacea was closely related to P. crassa, with strong support based on the ITS + nLSU genetic loci. Scopuloides hainanensis was sister to S. yunnanensis and was grouped with other species of Sicyoideibasidia, both relationships strongly supported by ITS + nLSU + tef1 genetic loci. A full description, illustrations, and phylogenetic analysis results of the two new species are provided here. In addition, Sicyoideibasidia yunnanensis is secondly recorded after its original description, and it was found on Arundo donax from Guangxi Autonomous Region, Southern China.
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