Leptographium wushanense sp. nov., associated with Tomicus armandii on Pinus armandii in Southwestern China

Abstract Leptographium wushanense sp. nov., which is associated with Tomicus armandii , is described based on molecular sequence data and morphological characters. The phylogenetic analyses based on ITS2-partial LSU rDNA region, β-tubulin and elongation factor 1-α genes showed that L. wushanense formed a well-supported clade and was closely related to L. conjunctum and L. yunnanense , and then nested within L. lundbergii complex. The species is characterized that its conidiophores were longer than those of L. yunnanense and shorter than those of L. conjunctum , while its conidia were larger than those of L. conjunctum and smaller than those of L. yunnanense . Furthermore, the colonial growth of L. wushanense is faster than those of L. conjunctum and L. yunnanense at 25 °C on 2% MEA. Both molecular data and morphological comparison confirmed the placement of the new species in genus of Leptographium .