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

Abstract

Two new species of Amanita sect. Roanokenses (Amanitaceae, Agaricales, Basidiomycota), Amanita alboradicata and A. fulvopyramis are proposed here on morphological and molecular evidence. The described and illustrated are based on morphological studies of collections from Jilin, Zhejiang and Hunan provinces in China. Nuclear ribosomal large subunit (nrLSU), RNA polymerase II second largest subunit (rpb2) and translation elongation factor 1-α (tef1-α) sequences analyses supported establishment of these two new species and revealed their phylogenetic positions. Both new species possess long radicating basal bulbs. Amanita alboradicata is characterized by a white or dirty white pileus covered with angular warts. Amanita fulvopyramis is characterized by the brown orange to light brown, pyramidal to verrucose volval remnants on the pileus, and light brown to brown lamellae. Holotypes are deposited in the Mycological Herbarium of Hunan Normal University.