Three New Species of Hypoxylon (Xylariales, Ascomycota) on a Multigene Phylogeny from Medog in Southwest China

Abstract

During a survey of hypoxylaceous fungi in Medog county (Tibet Autonomous Region, China), three new species, including <i>H</i><i>ypoxylon damuense</i>, <i>H</i><i>ypoxylon medogense</i>, and <i>H</i><i>ypoxylon zangii</i>, were described and illustrated based on morphological and multi-gene phylogenetic analyses. <i>H</i><i>ypoxylon damuense</i> is characterized by its yellow-brown stromatal granules, light-brown to brown ascospores, and frequently indehiscent perispore. <i>H</i><i>ypoxylon medogense</i> is morphologically and phylogenetically related to <i>H. erythrostroma</i> but differs in having larger ascospores with straight spore-length germ slit and conspicuously coil-like perispore ornamentation. <i>H</i><i>ypoxylon zangii</i> shows morphological similarities to <i>H. texense</i> but differs in having Amber (47), Fulvous (43) and Sienna (8) KOH-extractable pigments and larger ascospores with straight spore-length germ slit. The multi-gene phylogenetic analyses inferred from the datasets of ITS-RPB2-LSU-TUB2 supported the three new taxa as separate lineages within <i>Hypoxylon</i>. A key to all known <i>Hypoxylon</i> species from China and related species worldwide is provided.