The cap of A. aureofloccosa is up to 80 mm wide,
plano-convex, rather thin-fleshed, with a nonsulcate margin. The cap is golden yellow with an orange-yellow,
pulverulent-floccose to squamulose, detersile covering.
The gills are free, rather crowded, narrow to moderately broad, and white. The short gills are attenuate.
The stem is up to 140 × 7 - 18 mm, tapering upward, hollow, pale yellow at the base
and top, and the rest covered by orange-yellow, floccose scales.
The spores measure (6.0-) 7.0 - 8.5 (-9.0) × (6.0-) 6.5 - 8.5 µm and are amyloid and globose to
subglobose. Clamps are not found at bases of basidia.
Amanita aureofloccosa was originally described as a Lepiota from what
is now the Republic of Congo. It was collected in dry forest.
Bas placed the present species in his stirps Thiersii. See A. thiersii Bas
for information on other taxa now placed in that stirps.—R. E. Tulloss
The editors of this site owe a great debt to Dr. Cornelis Bas
whose famous cigar box files of Amanita nomenclatural information
gathered over three or more decades were made available to RET for computerization
and make up the lion's share of the nomenclatural information presented on this site.
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 and the type study of
protolog: 80 mm wide, yellow,
plano-convex; context white, thin;
margin not described; universal veil as
covering of orange farinaceous squamules, easily
up to 80 mm wide, golden
yellow, plano-convex; context rather thin,
white; margin nonstriate, appendiculate;
veil as orange-yellow pulverulent-floccose to
squamulose covering, detersile.
protolog: free, not remote,
free, rather crowded, white,
moderately broad, with entire edge; lamellulae
protolog: 140 × 12.5 mm,
narrowing upward, 7 mm wide at apex, 18 mm wide at
base, with base rounded, decorated by universal veil
(see below); context white; partial
veil "membranous, friable," orange, to 20% of
pileus (width?); universal veil decorating
stipe from partial veil to several cm above
up to 140 × 7 - 18 mm,
pale yellow (visible at top and at base),
narrowing upward; bulb absent or slight;
context hollow, white; partial veil
apical, pendent, submembranous-subpulverulent,
orange-tinged; universal veil as
floccose scales over most of stipe.
difficult to delimit from pileus
context and universal veil remnants, not gelatinized,
as rather thick yellowish-brownish layer; filamentous
hyphae 4 - 10 (-15) μm wide, repent
interwoven, with some slightly encrusted.
bilateral, divergent, with
divergent elements up to 30 μm wide, inflated
terminal cells probably lacking.
35 - 40 × 7 - 8 μm,
4-sterigmata; clamps not observed.
On pileus: inflated cells
yellowish-brown, subcylindric to elongate-fusiform to
slenderly clavate, up to 210 × 40 μm, in
loosely arranged, interwoven, periclinally to
anticlinally oriented chains.
On stipe: similar to material on pileus, but
with elements usually smaller; filamentous hyphae
3 - 10 μm wide.
filamentous hyphae 3 - 10 μm wide;
acrophysalides up to 400 × 40 μm,
terminal singly or in chains.
"The fruit-bodies of
Goossens-Fontana 280 were collected on at least two
different dates. As Beeli
mentioned April 1923 as the collection date in the
protologue, the part of Goossens-Fontana 280
collected on that date is selected as
lectotype. The rest of the specimens of
Goossens-Fontana 280, the collection date of which
is uncertain, represents one or more syntypes,
cited indirectly in the original description, viz.
by the number 280. However that may be, all
specimens of Goossens-Fontana 280 appear to be
"Amanita aureofloccosa from Central Africa is
the only species in section Lepidella with
really bright colours. Yet the type of spore,
the type volva, and the slender, early hollow stem
demonstrate such a close affinity to
that it must be placed in the same stirps as that
Wartchow et al.
report this species from
semideciduous, seasonal forest in the state of Rio
Grande do Sul, Brazil.
—R. E. Tulloss
Information to support the viewer in reading the content of "technical" tabs
can be found here.
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.