Mycelium consists of loosely associated hyphae that are typically scattered, although sometimes arranged in chains, and show branching to form clumps or strands of filaments and sometimes runs or funnels. Hyphae are typically 2-3 µm in diameter, translucent, but may be hyaline (Wu et al. 2002), and may stain 1 % KOH bluish-black (Moncalvo 2000). Sometimes hyphal tips and the tips of the existing hyphae are crowded with aleurioconidia, which then mature into basidia. The median spore produced from a basidium is referred to as the basidiospore. The basidiospore is typically warty, in a bi- or tricolpate shape, and may be 3-6 µm in diameter. If several basidia are synthesizing basidiospores at the same time, a mat-like, atmosphere-uptaking pelote may appear on the surface of the fruit-body. This pelote is formed from the basidiospores flushing out of the host and the collapse of the not quite mature hyphae after reaching maturity. The hymenium is represented by the pileus (the cap or the epidermis of the stalk), gills and lamellae and is divided into the gill edge, lamella and pileal surface.
Gills are subventral, white and attached to margin of the cap or frequently free and lateral. The pileus is composed by a cap surface and a stem. The cap surface can be either smooth or hairy. The collection of gills is either free or attached to a stem, which has 3-8 cartilage rings. The color of the cap is a dull brown to chocolate.
The cap skin is composed by two distinct zone: a medianly white area and a concentrically darker area. The margin of the cap is usually umbonate, although it may be radiate and revolute or convolute from the base. The context is a stem. d2c66b5586