The following is based on the original description (Bas 1969).
The cap of Amanita lanosula is about 60 - 100 mm wide, more or less plano-convex, perhaps with a slight, central depression, and with a vague umbo. The appendiculate margin is not (or vaguely) striate. At first, the cap is entirely covered with a dark brown, floccose-warty volva; in age this tends to break up into dark brown, small warts at the center and then completely disappears exposing a somewhat paler brown(?), shiny cap.
The gills are crowded, free, moderately broad to rather narrow, and white(?). The short gills are obliquely truncate to attenuate.
The stem is about 120 - 200 × 5 - 15 mm, exannulate, probably brown or brownish, fibrillose, with scattered, very small, dark brown, scale-like warts at the base of the stem and on the upper part of the bulb, which is slenderly fusiform to elongate napiform.
The spores measure 8 - 10 × 5.5 - 6.5 µm and are amyloid and ellipsoid to elongate. Clamps are present at bases of basidia.
This species was described from what is now the Democratic Republic of Congo. It was reportedly associated with Gilbertiodendron (=Macrolobium) dewevrei (De Wildem.) Léon.
The present species differs from A. lanosa Beeli by having differently shaped spores, a different pattern of gelatinization of the cap surface, a thinner annulus with less material left on the upper stem, a more slender bulb, and some volval scales on the base of the stipe above the bulb.
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where data is missing or uncertain.
The following material is derived from the protolog of the present species.
from protolog: Basidiomes medium to large, slender.
from protolog: ca. "60 - 100 mm wide, paler ?brown than universal veil, more or less plano-convex, perhaps with slight, central depression" including vague umbo, shiny where exposed in age; context not recorded; margin appendiculate, not or vaguely sulcate; universal veil originally as floccose-verrucose complete covering (perhaps with more pronounced warts when young), dark brown, adnate, in age tending to break up into small warts over disc, these soon completely disappearing to reveal surface.
from protolog: free, crowded, ?white, rather narrow to moderately broad, with edge entire; lamellulae obliquely truncate to attenuate.
from protolog: ca. 120 - 200 × 5 - 15 mm, probably brown or brownish, fibrillose; bulb elongate-napiform to slenderly fusiform, slightly rooting; context not recorded; partial veil probably as fibrillose material on upper stipe; universal veil as scattered scale-like warts on base of stem and upper part of bulb, very small, dark brown.
from protolog: with gelatinized suprapellis evident only over disc in areas not covered by universal veil; filamentous hyphae 2 - 8 μm wide, interwoven, colorless to brownish; clamps present.
from protolog: bilateral; with elements up to 25 μm wide; clamps present.
from protolog: ramose to inflated-ramose.
from protolog: 40 - 50 × 10 - 11 μm, 4-sterigmate, often with refractive contents; clamps present.
from protolog: On pileus, upper layer: filamentous hyphae 2 - 10 μm wide, scattered, branching; inflated cells dominating, globose to ellipsoid, up to 50 × 40 μm, rarely 80 × 70 μm, with brown vacuolar pigment, in easily broken branching chains. On pileus, lower layer: filamentous hyphae more abundant than in upper layer; inflated cells larger than in upper layer (up to 90 × 45 μm), more often ovoid to broadly clavate, with rows of short elongate cells connecting larger cells to hyphae of pileipellis. On stipe base: filamentous hyphae abundant; inflated cells brown, mainly globose, but also clavate, elongate or irregularly shaped. [Note: The phrases "short elongate" is not self-contradictory; Bas uses "elongate" in the sense in which he applies it to the shape of (e.g.) spores—describing a shape that is proportionately more narrow than "ellipsoid" and proportionately broader than "cylindric."—ed.]
from protolog: longitudinally acrophysalidic.
from protolog: inflated cells dominating, clavate, up to 75 × 35 μm.
lamella edge tissue
from protolog: not observed.
from protolog: [20/2/2] 8.0 - 10.0 × 5.5 - 6.5 μm, (Q = 1.40 - 1.70 (-1.85); Q = 1.50 - 1.60),yellowish in ammonia, amyloid, ellipsoid to elongate; apiculus proportionately small; contents usually granular and refractive; color in deposit not recorded.
from protolog: Terrestrial in forest of Gilbertiodendron dewevrei (De Wildem.) Léon. ("Macrolobium dewevrei").
from protolog: CONGO, DEMOCRATIC REPUBLIC OF: PROV. EQUATEUR—Territoire Lisala, Binga, 4.xii.1928 M. Goossens 852B (holotype, BR).
from protolog: "Amanita lanosula is based on two specimens found in the type collection of A. lanosa.... It differs from A. lanosa in having: (i) ellipsoid to elongate spores; (ii) a pileipellis gelatinizing only at centre and not at margin of cap where the volva forms a continuous, adnate layer, and probably also in having (iii) a slenderly fusiform to elongate-napiform bulb with at the upper part small, scattered, wart-like volval remnants, and (iv) a thinner velum partiale, hence a not really lanose upper part of the stem. Judging by the two specimens available, A. lanosula also has less conspicuous warts on the cap than A. lanosa. It is possible, however, that the outer layer of the volva is more verrucose in young specimens but has disappeared in the specimens studied.
"Although information on several characters of the fresh fruit-body of A. lanosula is still lacking, it will not be difficult to recognize if it is collected again."
—R. E. Tulloss
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