Anthracophyllum sontraense (Omphalotaceae, Agaricales), a new species from Danang, Vietnam

During the collection of macrofungi resources in Son Tra Nature Reserve, Danang, Vietnam, a novel species of the genus Anthracophyllum living saprophytically on small shrubs and rotten wood of Mussaenda frondosa Linn in the forest at an elevation 368 m above the sea level was recorded. The phylogenetic analyses based on the combined ITS and LSU molecular markers placed the specimens within Anthracophyllum genus. Together with specific morphological characteristics, we introduced A. sontraense sp. nov. as a new species. A. sontraense was characterized by the pileus with the skewed bell shape when young, dark blue to midnight blue, 1.0−1.5 cm diam, stipeless, light pink lamellae, sparse, occasionally branching. Basidiospores broadly ovoid to subglobose, 6–7 × 5.5–6 µm. Molecular phylogeny analyses revealed that the new species formed a clade with A. archeri with strong support. In addition, A. sontraense formed a separate lineage which was closer related to A. archeri and A. sinense than A. lateritium . To our knowledge, this is the first record of Anthracophyllum fungus in Vietnam.