The following description is based on Beeli (1935) and Gilbert (1941.
The cap of Amanita subviscosa is
50 mm wide, fleshy, plano-convex, slightly squamulose and viscid, entirely white, with a slightly striate margin. The flesh is white and becomes slightly pink on contact with air.
The gills are free, 5 mm wide, pointed on both ends, and off-white.
Its stem is 100 × 7 - 11 mm, cylindric, fibrillose, white, straight, stuffed, and slightly furfuraceous. The ring is friable, white, leaving only a slight trace on the stem. Madame Goossens' watercolor shows the flocculence restricted to the upper part of the stem. The volva is ample and white. The volva limb is moderately thick and essentially saccate. The stem appears to be totally elongating.
The taste is sweet.
The spores measure 7.1 - 9.1 × 3.5 - 4.2 µm (Gilbert 1941) and are elongate to cylindric and amyloid.nbsp; If placement in sect. Amidella is correct, then there are probably no clamps at bases of basidia.
The present species was originally described from the Democratic Republic of Congo scattered in forests.
The volva with an inner surface layer leaving squamules on the cap, the striate cap margin, the white flesh turning pink when cut, the exannulate stem with a floccose remnants in its upper portion, and narrow spores are all consistent with placement of this species in section Amidella.—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 taxon, (Beeli 1935), and (Gilbert 1940 & 1941).
from protolog: 50± mm wide, entirely white, plano-convex, lightly squamulose and viscid; context fleshy, becoming pinkish on exposure; margin lightly striate; universal veil ?as squamules.
from protolog: free, density not described, white, 5 mm broad; lamellulae not described.
from protolog: 100± × 7 - 11 mm, white, fibrous, lightly furfuraceous; bulb ?clavate or ?lacking (per figure); context hollow, becoming pinkish on exposure; partial veil ephemeral, leaving only slight trace; universal veil membranous, ample, white, fleshy (per figure), enclosing ca. lowest 25% of stipe (per figure), attached only at stipe base (per figure).
from protolog: Odor not described. Taste sweet.
Beeli (1935): filamentous hyphae broad and thin. [Note: This description seems self-contradictory. Perhaps there is a wide range of widths among the hyphae in the pileipellis.—ed.]
from protolog: 6 - 7 × 3 - 3.5 μm, hyaline, smooth, ellipsoid. [Note: From the spore size data, the spores would have to be cylindric on average. The data seems unreliable in comparison to the spore drawings of Gilbert (1940). No sporograph is generated.—ed.]
Beeli (1935): white in deposit.
from Gilbert (1940 & 1941): [8/1/1] 7.1 - 9.1 × 3.5 - 4.2 μm, (L = 8.2 μm; W = 3.9 μm; Q = 1.98 - 2.39; Q = 2.13), hyaline, smooth, amyloid, elongate to cylindric, adaxially flattened; apiculus sublateral and cylindric (per figure); contents not described; white in deposit. [Note: Spore measurements are taken from the eight drawings of (Gilbert 1940: tab. XXVIII (fig. 6)) that are in apparent lateral view.—ed.]
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.