M. mustea. Unlike that of M. fonticola, the cap of M. mustea typically becomes pale grayish-purple when mature; the cheilocystidia have several short finger-like excrescences at their tips; and the stem cuticle is made up of smooth hyphae. In contrast, the cap of M. fonticola becomes dark violet-brown when mature; there are no excrescences on the cheilocystidia; and the hyphae of the stem cuticle are sparsely covered with diverticulae that resemble warts or fingers. Habitat and distribution Mycena mustea is known only from Kanagawa, Japan. The mushroom is found growing solitary to scattered on dead fallen twigs in lowland forests dominated by the hornbeam carpinus (Carpinus tschonoskii) and the Chinese evergreen oak (Quercus myrsinaefolia). References External links The Agaricales in Southwestern Islands of Japan Images of the holotype specimen mustea Fungi of Asia Fungi described in 2007