Two new species of Amanita section Roanokenses with a radicating basal bulb

Two new species of Amanita sect. Roanokenses (Amanitaceae, Agaricales, Basidiomycota), Amanita alboradicata and Amanita fulvopyramidalis, are proposed here based on morphological and molecular evidence. The descriptions and illustrations are based on the morphology of specimens collected from Jilin, Zhejiang, and Hunan provinces in China. Analyses of nuclear ribosomal large subunit (nrLSU), RNA polymerase II second largest subunit (RPB2), and translation elongation factor 1-α (TEF1-α) sequences supported recognition of the two new species, in combination with morphological evidence, and revealed the phylogenetic relationships of the new species. Both new species possess long radicating basal bulbs. Amanita alboradicata is characterized by a medium-sized to large-sized, white to dirty white pileus with volval remnants large, white to dirty white verrucose to conical at the center but passing into verrucose to floccose squamules towards the margin; a radicating basal bulb; and basidiospores 10–12 × 5.5–7 μm in size. Amanita fulvopyramidalis is characterized by a medium-sized to large, light yellow to dark yellow pileus with volval remnants large, brown-orange, light brown to brown, acute pyramidal at the center but passing into conical to verrucose squamules towards the margin; light brown to brown lamellae; a radicating basal bulb; and basidiospores 9–11 × 7–8.5 μm in size. Holotypes of the two species are deposited in the Mycological Herbarium of Hunan Normal University.