description is based on Gilbert
and the notes with the type
The cap of Amanita thejoleuca is 60 - 80 mm
wide, fleshy, pale brownish yellow, with color more saturated over the
center, sometimes with a central depression, plano-convex, with a
nonstriate margin. The volva is absent.
The gills are free, crowded, white, becoming
tinted with yellow when bruised.
The stem is 30 - 80 × 10 mm, pithy,
white, subtly striate
bulb is ovoid to globose, marginate, 20 - 25 mm wide. The ring is
membranous, superior, white, often tearing away from stem during
expansion. The volva is limbate, membranous, intimately connected to the
bulb, white, persistent, with highest point 20 - 30 mm above the base of
The spores measure 7 - 8 × 5 - 6 µm and
are subglobose and amyloid. Gilbert's (1941) drawings of spores
sometimes do not match the information provided in his descriptions.
Measuring the spore drawings yields 8.9 - 11.5 × 7.8 - 10.3 µm.
Basidia probably lacking clamps because of its assigned section.
Originally collected in Madagascar,
The original collector, Decary, provides
a pencil sketch of the type. His measurement of the stem clearly
includes that of the bulb which is proportionately quite large. In one
of his drawings, it is clearly the shape of an egg. The other drawing
shows the bulb flattened at the base.—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.
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.
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 not directly from the protolog of the present taxon and not cited as the work of Dr. Z. L. Yang or another researcher is based upon original research by R. E. Tulloss.
60 - 80 mm wide, pale brownish yellow, with color more saturated over disc, plano-convex, subirregular, sometimes with central depression, dry; context fleshy; margin nonstriate; universal veil absent.
free, crowded, white, becoming tinted with yellow when bruised; lamellulae not described.
30 - 80 × 10 mm, white, subtly striate above; bulb ovoid to globose, marginate, 20 - 25 mm wide; context pithy; partial veil membranous, superior, white, often tearing away from stipe during expansion, evanescent; universal veil limbate, membranous, intimately connected to bulb, white, persistent, with highest point 20 - 30 mm above base of bulb.
from Gilbert's data from holotype (1940): [3/1/1] 8.8 - 11.3 × 7.5 - 10.3 μm, (L = ?? μm; L' = ?? μm; W = ?? μm; W' = ?? μm; Q = 1.10 - 1.31; Q = ??; Q' = ??),
hyaline, colorless, smooth, ??-walled, amyloid, globose[?] to subglobose to broadly ellipsoid[?]; apiculus sublateral, cylindric; contents not described; white in deposit.
[Note: The most reliable information is derived from the text and illustrations (Tab. XXXIV, fig. 4) of Gilbert (1940 & 1941). The best size-shape information is derived from measuring the scale drawings of spores in the above cited figures. On the other hand, of the four spores drawn from the holotype (fig. 4), three could be interpreted to be drawn in lateral view.—ed.]
In heaps of plant detritus.
MADAGASCAR, REPUBLIC OF: Maromandia, ??.xii.192?? R. Decary s.n. (holotype, PC).
—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.