The following is based on the original description by Corner and Bas
The cap is 60 - 80 mm wide, plano-convex with a slightly depressed center, dry
or slightly viscid, dark fuscous-gray over the center, paler toward the margin, with darker, fibrillose streaks,
with a nonstriate margin. The cap is set with small, conical to wart-like, pale grayish remnants of volva,
diminishing in size toward the margin.
The gills are free, crowded, white to very pale ochraceous and intermixed with attenuate short gills.
The stem is 70 - 80 × 8 - 10 mm, solid, pale gray at the lower part, with the upper
part of the bulb set with concentric circles of pale grayish to whitish, thick, flat, small warts.
The spores measure 4.9 - 6.1 (-7.0) × 4.3 - 4.6 µm and are broadly ellipsoid to
ellipsoid (occasionally, subglobose) and amyloid. Clamps were not observed at the bases of basidia.
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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 from the protolog of the present species.
from protolog: 60 - 80 mm wide, dark-fuscous gray over disc, paler toward margin, with darker fibrillose streaks, plano-convex with slightly depression over disc, dry or slightly viscid; context white except gray below pileipellis, becoming slightly pale ochraceous-buff on cutting; margin nonstriate; universal veil as small, conical to wart-like, pale grayish remnants diminishing in size toward margin.
from protolog: free, crowded, white to very pale ochraceous; lamellulae attenuate.
from protolog: 70 - 80 mm × 8 - 10 mm (width measured at apex), below partial veil pale gray and finely cottony-subvillose; bulb 20 - 22 mm wide, turbinate; context solid, white, becoming slightly pale ochraceous-buff on cutting; partial veil apical, membranous, ample, 10 - 20 mm wide, white and striate above, grayish cottony-flocculose beneath, often with gray warts at edge; universal veil as 2 - 3 concentric circles of warts on upper part of bulb, pale grayish to whitish, thick, flat, small.
Odor and taste not recorded.
from protolog: in two layers; suprapellis gelatinized; subpellis ungelatinized, brown; filamentous hyphae 1.5 - 8 μm wide, radially arranged; clamps absent.
from protolog: On pileus: filamentous hyphae rather plentiful, 3 - 9 μm wide, branching; inflated cells [plentiful?] globose to ellipsoid, e.g. 80 × 45 μm or 70 × 70 μm, brownish, probably mostly terminal; clamps absent. On stipe base: not described.
lamella edge tissue
from protolog: inflated cells globose, up to 30 μm wide; clamps absent.
[-/-/1] 4.9 - 6.1 × 4.4 - 4.6 μm, (Q = (1.10-) 1.25 - 1.45 (-1.55); Q = 1.30 - 1.35), amyloid, broadly ellipsoid to ellipsoid, seldom subglobose(; apiculus proportionately small; contents not recorded; color in deposit not recorded.
from protolog: Terrestrial in tropical forest.
from protolog: SINGAPORE: Botanic Gardens, Gardens' Jungle, 24.viii.1939 E. J. H. Corner s.n. (holotype, L), 28.xi.1940 E. J. H. Corner s.n. (L, watercolor drawing only).
from protolog: "The above description is based on the material of ‘Amanita 12’ and on three of the four fruit-bodies depicted on the plate bearing the same number. The fourth fruit-body depicted appears to belong to A. squamosa.... As the description of 'Amanita 12' contains a combination of the characters of A. tristis and A. squamosa, no data could be taken from it.
"Of ‘Amanita 5’, only a description is available and that seems to refer large specimens of A. tristis. They differ from the specimens described above by (i) a larger pileus, viz. 100 - 150 mm wide, (ii) a taller stipe, viz. 120 - 150 mm long, which is white instead of gray and turns slightly brownish on handling, (iii) a white ring without a colored edge, and (iv) persistently white flesh. All other characters, spore-size included, agree with A. tristis. However, as no material could be studied afterwards, the data mentioned above are not incorporated in the description of the present species.
"On account of its volva characters, A. tristis reminds one of A. sepiacea Imai from Japan. In both species, the upper part of the bulb is set with rings of more or less angular, rather thick, flat warts. However, A. sepiacea has a more sepia colored pileus and globulose to subglobulose, slightly larger spores. ...."
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.