All information is taken from the original description of Corner and Bas (1962).
The cap of Amanita elephas is 90 - 100 mm wide, campanulate at first, then at maturity planar to plano-concave and subumbonate, with a nonstriate margin. It is dark sepia at first and pale sepia or pale sepia-gray with paler spots later; the paler spots may fall in two zones—one at the margin and one surrounding the low central umbo. It is innately fibrillose and dry to viscid. One or two patches of volva may remain on the cap. The white flesh may turn slightly ochraceous when cut.
The gills are free and not crowded and number about 65; they are whitish cream and 9 - 10 mm broad. The short gills are rounded attenuate and 1 - 3 are placed between every pair of gills.
The stem is 120 × 10.5 mm, with a clavate to bulbous base 20 - 25 mm wide and slightly pointed on the bottom. It is white, solid, undecorated below the annulus and "somewhat floccose-scaly above." The annulus is 12 mm wide, attached about 30 mm below the top of the stem, "rather spreading, floccose-membranous, easily torn, white to cream," and striate above. The limbate volva is 28 - 35 mm high; its lower half is attached to the stem's basal bulb. The volva's limb is "thin but tenacious" and membranous, white, smooth, and clings close to the stem; it may have an even margin or be split on one side.
The spores from dried material measure 5.4 - 6.8 × 4.6 - 5.6 µm (from fresh material, 7.0 - 8.0 × 5.5 - 6.0 µm) and are subglobose to broadly ellipsoid to obovoid and amyloid. Clamps were not observed at the bases of basidia.
Amanita elephas was originally described from Singapore.
Its authors compared it with A. modesta Corner & Bas. It should be treated as deadly poisonous until more is known of this species.—R. E. Tulloss
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L (in liquid)
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
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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 entirely from the protolog of the present taxon.
from protolog: 90 - 100 mm wide, dark sepia at first, pale sepia or pale sepia-gray with paler spots later on, darker innately fibrillose in outer half of limb, campanulate when young, becoming subumbonate plane to plano-concave with age, smooth, dry to slightly viscid (presumably very viscid when wet); context white, turning slightly ochraceous when cut, becoming thin over lamellae and toward margin; margin not striate; universal veil absent or as few large membranous patches, irregular, thin, white.
from protolog: free, not crowded, whitish cream, broad, 9 - 10 mm wide, about 65 primaries; lamellulae rounded-attenuate to attenuate, 1 - 3 between each pair of otherwise adjacent lamellae.
from protolog: 120 × 10.5 mm, white, smooth below ring, somewhat floccose-scaly above ring; context solid, firm; bulb slightly pointed clavate-bulbous, 20 - 25 mm wide; partial veil white to cream, floccose-membranous, pendent, attached 30 mm below apex, 12 mm wide (from stipe surface to edge measured radially), somewhat flaring, easily torn, striate above; universal veil as limbate volva, with thin tenacious membranous limb 28 - 35 mm high, lower half attached to bulb of stipe, with edge even or split on one side, white, smooth.
from protolog: ca. 400 µm thick (in button even 800 µm thick); suprapellis ca. 200 µm thick, gelatinized; subpellis ca. 200 µm thick ungelatinized; filamentous hyphae in suprapellis 3 - 5 µm wide, very distant, irregularly disposed near surface, subradial in lower part; filamentous hyphae in subpellis dense, up to 15 µm wide, irregularly interwoven, slightly constricted at septa.
from protolog: distinctly bilateral; central strand and divergent zones not strongly differentiated from each other; filamentous hyphae 5 - 20 µm wide; inflated cells cylindric to elongate-ellipsoid, 30 - 100 µm.
from protolog: 32 - 38 × 7 - 11 µm, 4-sterigmate, with sterigmata up to 4 µm long; clamps not observed.
from protolog: On stipe base, exterior surface layer: filamentous hyphae 2 - 4 µm wide, irregularly disposed, densely interwoven, thin-walled. On stipe base interior layer: all elements with walls slightly thickened; filamentous hyphae up to 10 (-18) µm wide, flexuous, interwoven; inflated cells up to 120 × 25 µm, scattered. On stipe base, inner surface layer: all elements with slightly thickened walls; filamentous hyphae 3 - 8 µm wide, longitudinally or slightly irregularly disposed; inflated cells elongate to ellipsoid to clavate, scattered.
from protolog: longitudinally acrophysalidic; filamentous hyphae noticeable near surface, narrow; acrophysalides up to 350 × 35 µm.
lamella edge tissue
from protolog: inflated cells globose to ellipsoid to clavate, up to 45 × 35 µm, colorless, numerous.
[-/-/1] 5.4 - 6.8 × 4.6 - 5.6 μm,
(Q = 1.05 - 1.25; Q = 1.15 - 1.20),
hyaline, colorless, smooth, thin-walled, amyloid, subbglobose to broadly ellipsoid to obovoid; apiculus proportionately small; contents cloudy-vacuolate; color in deposit not recorded. [Fresh spores reported to measure 7.0 - 8.0 × 5.5 - 6.0 μm.]
from protolog: Terrestrial in tropical forest.
from protolog: SINGAPORE: Botanic Gardens, Gardens' Jungle, xvi.viii.1940 E. J. H. Corner s.n. (holotype, L in liquid, with watercolor drawing); Reservoir Jungle, 15.iv.1941 E. J. H. Corner s.n. (paratype, L, button in liquid, with watercolor drawing).
from protolog: "Amanita elephas has much in common with A. modesta; however, the different structure of the volva (no sphaerocysts), the thick cuticle, the broad, not crowded gills, and the large size [of the present taxon] demonstrate that it is different.
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.