Fruiting bodies of A. innatifibrilla are small. The cap is 25 - 45 mm wide, convex to applanate to concave,
dark grey-brown to fuligineous over the center, becoming paler towards
the margin. It appears innately radially fibrillose and is covered with verrucose to felty volval remnants that are whitish on
their upper parts and grayish to brownish on their lower parts.
The cap's margin is smooth and non-appendiculate, and the context is white.
The gills are free, crowded, and white; the short gills are attenuate.
The stipe is 40 - 60 × 4 - 6 mm, subcylindric or attenuate upwards, with a
surface that is whitish to greyish. The stipe's basal bulb is 6
- 10 mm wide, nearly fusiform, and has its upper part covered with
grayish to brownish verrucose, floccose to farinose volval remnants.
The stipe bears a ring that is membranous, with an upper surface that s whitish and a lower surface that is greyish.
The spores of this species measure 6.5 - 8.0 (-9.5) × 5.5 - 7.0 (-7.5) µm
and are subglobose to broadly ellipsoid and amyloid. Clamps are not
present at the bases of basidia.
Amanita innatifibrilla was proposed provisionally based on a collection made in southwestern
China. Its distribution range is unknown.—Zhu L. Yang
Zhu L. Yang nom. prov.1997. Biblioth. Mycol. 170: 193, figs. 160-163.
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.