Fruiting bodies of Amanita fuliginea
are small to medium-sized. The cap is 30 - 60 mm wide,
convex, dark grey to blackish, darker over disc, innately
fibrillose, usually glabrous; the cap's margin is smooth
and non-appendiculate; and the cap's context is white to whitish.
The gills are free to subfree and white; the short gills are attenuate.
The stem is 80 - 130 × 5 - 20 mm, subcylindric to attenuate upwards, surface white to
greyish, and covered with brownish squamules; the stem's
basal bulb is 10 - 30 mm wide and subglobose. At the
stem's base, the volva is limbate, with a free, white
limb 3 - 8 mm high. The annulus is membranous and grey to greyish.
This species is deadly POISONOUS.
The spores measure (7.5-) 8.0 - 10.0 (-11.0) × (6.5)- 7.0 - 9.5 (-10.0) µm and are
globose to subglobose and amyloid. Clamps are not present on the bases of basidia.
Originally described from Japan, A. fuliginea is very common in China, especially in the
Each spore data set is intended to comprise a set of measurements from a single specimen made by a single observer;
and explanations prepared for this site talk about specimen-observer pairs associated with each data set.
Combining more data into a single data set is non-optimal because it obscures observer differences
(which may be valuable for instructional purposes, for example) and may obscure instances in which
a single collection inadvertently contains a mixture of taxa.