This description is taken from the original description of Bas
The cap of A. craseoderma is about 60 mm wide, plano-convex with a
subumbilicate center, with a broad, sulcate-striate
margin. The cap is very dark brownish gray with pale
marginal grooves. The volva is present as very few, small
dark gray-brown, irregularly shaped, wart-like remnants.
The gills are free, fairly crowded, and very pale grayish. The short gills are very
rare and (obliquely?) truncate.
The stem is 110 - 7 mm, subcylindrical, exannulate, fuscidulous gray, and
subglabrous to glabrous. The flesh is relatively thin and
very fragile. The volva forms one nearly complete,
narrow, dark gray-brown, subfloccose belt about 6 mm above the stem base.
The spores measure 7.5 - 9.0 × 7.0 - 8.0 µm, and are
subglobose and inamyloid. Clamps are absent at bases of basidia.
The word "craseoderma" means
"blended" or "mixed skin." This and
the proposed English name for the taxon refer to the
diversity of cell forms that appear in caps' skins in A.
Amanita craseoderma was
first described from material collected in primary forest
(Manaus, Amazonas, Brazil) by Dr. Rolf Singer.
Due to delays in data processing at GenBank, some accession numbers may lead to unreleased (pending) pages.
These pages will eventually be made live, so try again later.
INPA; isotype, L
The following text may make multiple use of each data field.
The field may contain magenta text presenting data from a type study
and/or revision of other original material cited in the protolog of the present taxon.
Macroscopic descriptions in magenta are a combination of data from the protolog and
additional observations made on the exiccata during revision of the cited original
The same field may also contain black text, which is data from a revision of the present
taxon (including non-type material and/or material not cited in the protolog).
Paragraphs of black text will be labeled if further subdivision of
this text is appropriate.
Olive text indicates a specimen that has not been
thoroughly examined (for example, for microscopic details) and marks other places in the text
where data is missing or uncertain.
The following material is derived from the protolog of the present species.
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.