Hyphoderma

The genus <i>Hyphoderma</i>, a significant group of corticioid fungi worldwide, is known for causing white rot in wood as wood decaying fungus. Based on a combination of morphological features and molecular evidence, five new species <i>viz.</i> <i>H. alboarachnum</i>, <i>H. bambusinum</i>, <i>H. fulgens</i>, <i>H. grandineum</i>, and <i>H. laceratum</i> from Yunnan Province in China, are proposed. Phylogenetic analyses were conducted using a combined dataset of internal transcribed space (ITS) and nuclear ribosomal RNA large subunit sequences (nLSU). The morphology and multi-gene phylogenetic analyses confirmed the placement of the five new taxa in the genus <i>Hyphoderma</i>. The species <i>H. alboarachnum</i> is characterized by membranous basidiomata with an arachnoid surface and oblong-ellipsoid to cylindrical basidiospores (5–6.5 × 2–3 µm); <i>H. bambusinum</i> is differs in its membranous basidiomata with an smooth surface and ellipsoid basidiospores (4.5–6.5 × 3–5 µm); <i>H. fulgens</i> is distinct by membranous basidiomata with an shiny surface and subcylindrical basidiospores (7.5–11.5 × 2.5–4 µm); <i>H. grandineum</i> is characterized by membranous basidiomata with an grandinioid surface and cylindrical basidiospores (7–9 × 2.5–4 µm); <i>H. laceratum</i> is differs in its membranous basidiomata with an smooth surface and subellipsoid basidiospores (6.5–9 × 3–4.5 µm). A full description, illustrations, and phylogenetic analyses results of the new taxa are provided.