The following is based on the description of Bas
The cap of Amanita crassiconus is about 70 - 90 mm wide, plano-convex,
rather fleshy, probably whitish or pale grayish, dry,
with a nonsulcate, appendiculate margin. The cap is
covered with pale gray, adnate warts, at the margin
merely felted-flocculose with some scattered, crust-like,
probably pale gray patches. No cap skin is present, and
the volval material is directly attached to the pileus
context. Some of the darkening of the volva in age is
apparently due to the dark hyphae of an infecting
hyphomycete. The flesh is white.
The gills are crowded,
free, moderately broad, and probably white or cream. The
short gills are attenuate.
The stem is about 80 - 100
× 8 - 10 mm, probably whitish on the upper part and
grayish below, probably solid, subfelted-flocculose,
exannulate (sometimes with narrow flocculose zone near
the stem's top). The lower stem has thin, felted,
incomplete, brownish-grayish volval girdles that
disappear with aging. The stem bears a clavate-fusiform
bulb measuring about 30 - 40 × 15 - 25 mm.
The spores measure (7.2-) 8.5 - 10.8 (-16.8) × (5.9-) 6.5 - 8.0 (-11.5) µm and are
amyloid and subglobose to ellipsoid. Clamps are present
at bases of basidia.
14-24.xii.2000 David Arora 00-400 (SFSU; RET 348-5)
B. Wolfe et al., Pringle Lab., Harvard
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 data presented below is derived from the revision of Bas (1969), from Dr. Bas' annotations and drawings concerning the Nigerian collection (generously copied for RET), and original research by R. E. Tulloss.
Bas (1969): [20/2/1] (7.0-) 8.0 - 10.0 (-10.5) × 6.5 - 7.5 (-8.0) μm, (Q = 1.10 - 1.50; Q = 1.30), slightly yellowish, thin-walled, smooth, amyloid, subglobose to broadly ellipsoid to ellipsoid, sometimes swollen at one end, sometimes adaxially flattened; apiculus not described; contents refractive, guttulate; color in deposit not recorded.
Bas (1969): NIGERIA: NIGER—Kantagora, viii.1963 S. O. Alasoadura 117 (K).
ZAMBIA: COPPERBELT PROV.—ca. Kitwe, in or ca. Chembe Reserve, 14-24.xii.2000 David Arora 00-400 (SFSU; RET 348-5); ca. Kitwe, ca. Garneton, 14-24.xii.2000 David Arora 00-351 (SFSU; RET 344-8), 00-379 (RET 345-2); off Kitwe-Ndola Rd., Greystone Farm, 14-24.xii.2000 David Arora 00-375 (SFSU; RET 348-7).
—R. E. Tulloss
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"African Thick-Warted Lepidella"
1. Amanita crassiconus - drawing by C. Bas
2. Amanita crassiconus - photo of David Arora
Drawing: Dr. Cornelis Bas (1969) (Nigeria, courtesy of Persoonia, Leiden, the
Photo: David Arora (Copper Belt Prov., Zambia)
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.