description is based on Gilbert (1941)
and the notes with the type collection (PC).
The cap of Amanita murinacea is 70 - 80 mm wide, dry, silky, mouse-gray, plano-convex, with a smooth
margin. Volval remnants are absent.
The gills are crowded, free, white.
The stem is 95 × 13 mm, cylindric, narrowing upward, with a bulbous base. The ring is
rather narrow, white, striate above, skirt-like. The volva is
membranous, limbate. The bulb is ovoid and 30 × 20 mm, white, tends to turn fulvous.
The spores measure 7 - 8 × 6 - 7 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 a length of 7.8 - 8.5 µm. Very few spores are positioned in side view and these
show the widths to be 7 - 8.3 µm. Basidia probably lacking clamps
because of its assigned section.
Originally described from Madagascar, Africa in sandy soil.
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 is derived from the protolog and from (Gilbert 1940 & 1941).
70 - 80 mm wide, mouse-gray, plano-convex, subundulating, becoming rimose, dry, silky; context not described; margin nonstriate; universal veil absent.
free, crowded, white; lamellulae not described.
95 × 13 mm, cylindric, compact; bulb ovoid, 20 mm wide; context not described; partial veil membranous, superior? to subapical?, white, pendulous, striate above; universal veil limbate, membranous, intimately connected with bulb, pallid fulvous or white becoming fulvous, with highest point 30 mm from base of bulb.
from Gilbert's data from holotype (1940): [4/1/1] 7.8 - 8.5 × 7.0 - 7.9 μm, (L = ?? μm; L' = ?? μm; W = ?? μm; W' = ?? μm; Q = 1.04 - 1.14 (-1.33); Q = ??; Q' = ??),
smooth, amyloid, globose to subglobose, infrequently[?] ellipsoid; apiculus sublateral, cylindric; contents not described; pale cream in deposit
[Note: The most reliable information is derived from the text and illustrations (Tab. XXXV, fig. 1) of Gilbert (1940 & 1941). The best size-shape information is derived from measuring the scale drawings of spores in the above cited figure. On the other hand, of the six spores drawn from the holotype (fig. 1), at most four could be interpreted to be drawn in lateral view.—ed.]
Solitary. In shady place, in sandy soil.
from protolog: MADAGASCAR, REPUBLIC OF: ca. Maromandia, Marokitraro, 27.xii.1922 R. Decary s.n. (holotype, PC).
—R. E. Tulloss
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Each spore data set is intended to comprise a set of measurements from a single specimen made by a single observer;
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a single collection inadvertently contains a mixture of taxa.