Amanita concentrica : a new species in Amanita section Amanita from Japan

Abstract

Amanita concentrica sp. nov. is described from an evergreen broad-leaved forest of Chiba Prefecture with Castanopsis cuspidata var. sieboldii and Quercus glauca. The fungus is a medium to large, white to yellowish-white mushroom characterized by many pyramidal warts on pileus, striate margin of pileus, distinct ascending concentric rings at upper part of stipe bulb, and inamyloid basidiospores. It is considered to belong to the section Amanita.