The cap of A. pausiaca is 60 mm wide, plane with a slightly depressed center, dry, with a finely sulcate-striate margin. The cap is bister-olivaceous, darker and more fuscous in the center, innately streaked with darker fibrils, and more or less concentrically spotted with small grayish patches.
The gills are distantly free, crowded, and white.
The stem is 70 × 6 - 13 mm, solid, pale yellow-olivaceous, and clearer yellow
near the apex. The volva is present as olivaceous, small warts.
The spores measure 5.1 - 6.1 × 4.4 - 5.8 µm and are amyloid and globose to broadly
ellipsoid. Clamps were not observed at bases of basidia.
The present species was originally described from Peninsular Malaysia.
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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).
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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.
from protolog: ca. 60 mm wide, bistre-olivaceous, darker and more fuscous over disc, innately streaked with darker fibrils, planar with slight depression over disc, dry; context white except fuscous olive below pileipellis, thin, 4 mm thick above stipe; margin finely sulcate-striate; universal veil as more or less concentrically arranged small patches, grayish.
from protolog: distantly free, crowded, white, 5 - 6 mm broad, 81 primaries; lamellulae attenuate, with 1 - 3 between each otherwise adjacent pair of lamellae.
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from protolog: ca. 70 × 6 mm (width measured at apex), pale yellow-olivaceous, clearer yellow near apex, fibrillose below partial veil, minutely pruinose above; bulb clavate, 13 mm wide; context solid, white; partial veil pendent, membranous, 10 mm measured radially from attachment to edge, white with yellowish subverrucose edge; universal veil at base with 2 - 3 rings of fuscous-olivaceous small warts of volva.
from protolog: "rather thin"; suprapellis gelatinized; subpellis ungelatinized; filamentous hyphae 1.5 - 4.0 µm wide, with brown contents, radially arranged in subpellis, disordered in suprapellis; clamps not observed.
from protolog: On pileus: not described. On stipe base: filamentous hyphae 2.5 - 4 (-7) µm wide, plentiful, branching; inflated cells, mainly globose, infrequently ellipsoid or fusiform, presumably mostly terminal, pale yellowish-brownish in NH4OH, relative plenitude not described; clamps not observed.
from protolog: longitudinally acrophysalidic; acrophysalides up to 200 × 30 µm and perhaps larger; clamps not observed.
from protolog: [-/-/-] 5.1 - 6.1 × 4.4 - 5.8 μm, (Q = 1.0 - 1.20; Q = 1.10 - 1.15), hyaline, colorless, smooth, amyloid, globose to subglobose to broadly ellipsoid; apiculus proportionately medium-large; contents not recorded; color in deposit not recorded.
from protolog: Terrestrial in forest.
from protolog: MALAYSIA: NEGERI SEMBILAN— Angsi For. Reserve, 3.vii.1930 E. J. H. Corner s.n. (holotype, L).
from protolog: "This species is characterized by colors like those of Amanita phalloides and a volva like that of A. rubescens. Moreover, the very small spores are distinctive. Compare A. xanthomargaros."
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.