(Omphalotaceae, Agaricales), A New Species from Danang, Vietnam.

During the collection of macrofungi resources in Son Tra Nature Reserve, Danang, Vietnam, two fungal specimens of the genus , designated as M34295 and M3457, living on dead still-attached branches of L. at an elevation around 360 m above the sea level were recorded. The morphological characteristics of the specimens shared some common characteristics with spp. However, the specimens possessed some distinct characteristics from other species. The phylogenetic analyses based on the combined internal transcribed spacer (ITS) and Large Subunit (LSU) molecular markers of ribosomal genes revealed that the two specimens clustered in a single clade at species level with all tested species with strong bootstrap support of 99%. Among genus, our specimens seemed closest to in morphological and genetic characteristics. Based on the combination of morphological approaches and multilocus phylogenetic analyses, we introduced sp. nov. as a new species. was characterized by its skewed bell-like basidiome with the color of 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. To our knowledge, this is the first record of fungus in Vietnam.