This description is based on the original description (1982).
The cap of A. silvatica is 20 - 35 mm wide, convex to plane, slightly slippery when moist, yellowish orange to pale yellow toward the margin, glabrous, with sulcate-striate margin. The cap is scattered with irregularly shaped, yellowish, rather thick, floccose-membranous, flat patches from the volva. The flesh is white.
The gills are free and white to cream. Short gills were not described.
The stem is 35 - 45 × 3 - 7 mm, cylindric or narrowing upward, white to whitish cream. The basal bulb is globose or subglobose, white to pale cream. The stem is somewhat floccose in the lower part. A ring is absent. The volva is a free limb, white, sometimes with vertical splitting, with an yellowish-orange edge of the limb. The flesh is white.
Neither the odor nor the taste has been described for this species.
The spores measure (4.9-) 6.7 - 9.0 (-9.7) × (4.9-) 6.0 - 7.5 (-8.2) µm and are globose to subglobose and inamyloid. Clamps are absent at base of basidia.
The mushroom was found growing on the soil of a tropical rainforest, subgregariously. Amanita silvatica was originally described from the state of Quintana Roo (Mexico) near the Caribbean Sea coast.
In the original description, comparison to A. elata (Massee) Corner & Bas is suggested, however the evidence given does not suggest a close relationship.—R. E. Tulloss and L. Possiel
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The following material is derived from the protolog of the present species.
protolog: 20 - 35 mm wide, yellowish orange, pale yellow toward margin, convex to planar, smooth; context white; margin striate; universal veil absent or as scattered irregular flat patches, yellowish, floccose-membranous, rather thick.
from protolog: free, density not described, white to cream; lamellulae not described.
protolog: 35 - 45 × 3 - 7 μm, white to whitish cream, cylindric or narrowing upward, "somewhat floccose below"; context white; bulb globose to subglobose; exannulate; universal veil as limbate volva, with margin of free limb fibriate or lacerate and white to orange to yellowish.
protolog: Odor not distinctive. Taste not described.
protolog: 19.5 - 22 × 9 - 9.7 μm, 4-sterigmate, "ventricose" (broadly clavate per figure); clamps not observed.
protolog: [-/-/-] (4.9-) 6.7 - 9 (-9.7) × (4.9-) 6 - 7.5 (-8.2) μm, (est. Q = 1.11 - 1.20), hyaline, inamyloid, subglobose to broadly ellipsoid, rarely globose; apiculus short; contents not described; color in deposit not recorded. [Note: A range for Q has been estimated conservatively in order to make a sporograph possible.—ed.]
protolog: Subgregarious. On soil in tropical rain forest.
protolog: MÉXICO: QUINTANA ROO—ca. rd. from Puerto Morelos to Tulum, closer to crossing to Vallarta, footpath to sea, s.d. López 1847 (holotype, ENCB).
—R. E. Tulloss
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