The cap is 86 - 102 mm wide, brownish gray (5D3) over the center, paler toward the margin, faintly virgate, umbonate, subshiny, and tacky. The cap's flesh is white, brownish in the center (both under the cap's skin and just above the stem). The central cavity of the stem extends into the cap's flesh for about one half of the cap's thickness. The cap's margin is striate (extending 10 - 15% of the cap's radius). Volval remnants were absent on the few specimens that have been examined.
The gills are narrowly adnate with a decurrent tooth and a decurrent line on the very top of the stem. They are off-white in mass, off-white or watersoaked in side view, infrequently forking, and with margins that may become brown with aging. Short gills are truncate to subtruncate.
The stem is 63 - 100 × 11.5 mm, off-white, graying with handling, narrowing upward or cylindric, flaring at flaring at the very top, decorate with fine fibrils, and very finely and faintly striate. The stem's flesh is off-white, unchanging when cut or bruised, and may have larva tunnels that are the same color as the surrounding tissue or very pale tan. The stem is hollow and lined with white cottony material. The stem's ring is sometimes absent or (when present) is ragged, appressed, scant, and rather highly placed on the stem. The volva is sack-like, smooth, leathery, whitish, rather tough, membranous, dividing into flaring lobes, and less than 1 mm thick. A small, membranous internal limb (about 1 mm high) is present and placed just above the point of attachment of the volva to stem.
The odor and taste (if any) of this species have not been recorded.
The spores measure (8.4-) 8.7 - 11.9 (-14.0) × 5.6 - 7.3 (-8.4) µm and are ellipsoid to elongate and inamyloid. Microscopic examination of the gills has not been carried out, but if this species is properly placed in Amanita section Caesareae, then clamps should be rather common at the bases of basidia.
The reader may wish to compare the present mushroom with A. spretella. Unfortunately, relatively little is known about the latter.
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The following material is based upon original research by R. E. Tulloss.
86 - 102 mm wide, brownish gray (5D3) over disc, paler toward margin, faintly virgate, umbonate, subshiny, tacky; context white, brownish in disc both under pileipellis and just above stipe, 8 - 9 mm thick, thinning evenly up to 10 mm from margin, then membranous, with central cavity of stipe extending into this context about one half of thickness of pileus; margin striate (0.1 - 0.15R), nonappendiculate; universal veil absent.
narrowly adnate with decurrent tooth, with decurrent line on stipe apex, off-white in mass, off-white or watersoaked in side view, 8 - 11 mm broad, infrequently forking, with margins browning in age; lamellulae truncate to subtruncate.
63 - 100 × 11.5 mm, off-white, graying with handling, narrowing upward or cylindric, flaring at apex, decorate with fine fibrils, longitudinally striate; context off-white, unchanging when cut or bruised, larva tunnels concolorous to very pale tan, hollow, lined with white cottony material, having a 6 mm wide central cylinder; partial veil sometimes absent or (in one specimen) ragged, appressed, scant, superior; universal veil as saccate volva, smooth, leathery, whitish, rather tough, membranous, dividing into flaring lobes, less than 1 mm thick, ??typo?? - 15+ mm from highest point on limb to base of stipe, with limbus internus small (about 1 mm high) membranous and placed just above point of attachment to stipe.
Subgregarious. At low elevation in Atlantic Coastal Plain of eastern Virginia. In sandy loam, by path in rather low lying, damp, mixed woods.
U.S.A.: VIRGINIA—Lancaster Co. - Lancaster, Hickory Hollow Mem. Pk., 1.ix.1985 David C., Estelle H. & R. E. Tulloss 9-1-85-D (RET 205-8).
The specimens examined might suggest a large example of A. spretella, but the observed spores are too small for that species, although the Q values from the single, Virginia collection are appropriate. Considering the occurrence in similar, "leaky" ecosystems, the possibility of convergent evolution of spore shape cannot be disregarded.
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.