The cap of A. flavivolva is 40 - 53 mm wide, plano-convex, pale yellow to yellow with a grayish yellow to brownish orange disc; and it is whitish on the nonstriate, nonappendiculate margin. The cap is up to 3 mm thick above the stem. The volval remnants are friable and yellow (fading to whitish or tan) and easily lost.
The gills are narrowly adnexed to subadnate to just free, crowded, white, and up to 5 mm broad. Short gills are present, but their shape has not yet been recorded.
The stem is 65 - 80 × 4 - 11 mm, white, discoloring watery brown from handling, cylindric or narrowing upward, and has a slightly flaring apex. The stipe's bulb is reported as ovoid and 18 × 14 mm. The flesh is white and solid. The ring is superior, skirt-like, white, with bits of the yellow volva on its margin. The volva is yellowish and may be present as a slight pulverulence on the top of the stipe's bulb.
Odor is reported to be lacking.
The spores measure (6.5-) 7.5 - 8.5 (-9.2) × 4.8 - 5.5 (-5.8) µm and are amyloid and ellipsoid to elongate. Clamps are absent from the bases of basidia.
Amanita flavivolva was originally described from Florida. It is reported to be associated with pines.
The data on this species is limited, but thanks to a well-annotated 1993 collection sent to me by Robert S. Williams, I believe that this species belongs with the group of taxa similar to A. flavoconia G. F. Atk. var. flavoconia. Among these, it is most similar to A. elongata Peck.—R. E. Tulloss
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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
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Olive text indicates a specimen that has not been
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where data is missing or uncertain.
The following material not directly from the protolog of the present taxon and not cited as the work of Dr. Z. L. Yang or another researcher is based on original research by R. E. Tulloss.
from protolog: 60 - 70 mm wide, convext to broadly convex, pale-yellow with grayish disc, whitish toward margin; context white, unchanging, 4 mm thick above stipe; margin nonstriate, entire; universal veil in sparse, flat patches.
from protolog: adnate, crowded, white, unchanging, with margin fimbriate; lamellulae not described.
from protolog: 70 - 90 × 10 - 15 mm, white, unchanging, glabrous, narrowing upward, striate(?"ridged") above partial veil, flocculent-pulverulent below; bulb small, ovoid; context not described; partial veil ample, skirt-like, white, fixed 20 mm below apex, with yellow material of universal veil on edge; universal veil in small, yellow fragments near bulb and in/on substrate.
from protolog: Odorless. Taste mild, becoming acrid.
from type study of Jenkins (1979): [-/-/1]
7.8 - 8.6 × 5.1 - 5.9 μm, (Q = 1.40 - 1.69; Q' = 1.49), hyaline, thin-walled, amyloid, ellipsoid to elongate, often adaxially flattened; apiculus sublateral, short, cylindric; contents guttulate; color in deposit not recorded.
composite of data from all material revised by RET: [21/1/1] (6.5-) 7.5 - 8.5 (-9.2) × 4.8 - 5.5 (-5.8) μm, (L = 8.0 μm; W = 5.4 μm; Q = (1.35-) 1.41 - 1.77; Q = 1.56), ??, smooth, amyloid, ellipsoid to elongate, adaxially flattened; apiculus ??; contents ??; white in deposit.
from protolog: Under Quercus laurifolia.
RET: Florida: At 7 - 10 m elev. In sand, with Pinus.
from type study of Jenkins (1979): U. S. A.: FLORIDA— Alachua Co. - Gainesville, 16.vii.1950 W. A. Murrill F 19598 (holotype, FLAS).
FLORIDA—Charlotte Co. - Cecil M. Webb Wildlife Mgmt. Area [26°53' N/ 81°53' W, 7-10 m], 3.iv.1993 Robert S. Williams 439 (RET 089-1).
The following figure compares sporographs for the
present species and A. elongata Peck.
—R. E. Tulloss
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