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The following material is derived from original research of R. E. Tulloss.
30 - 40 mm wide, pale yellow to pale greenish yellow at first, sometimes developing brown to dark brown stains with age, hemispheric at first, then convex to broadly convex; context white, 1 - 2 mm thick at stipe, thinning evenly to margin; margin nonstriate, inflexed at first, nonappendiculate or appendiculate with small fragments of partial veil; universal veil as irregular patches (white, becoming brown, friable) or as reddish brown fibrils, detersile.
free, crowded, white to pale yellow-white, unchanging when cut or bruised, sometimes becoming pale gray with age, up to 3± mm broad, with white finely fimbriate edges; lamellulae rounded attenuate to attenuate, plentiful, unevenly distributed, with 1 to 3 between pairs of lamellae.
30± - 40± × 7 mm (at apex), white, unchanging or slowly bruising brown from handling, narrowing upward, longitudinally striatulate, decorated with concolorous fibrils; bulb subglobose, subabrupt to abrupt, 20± × 20 - 25 mm, white, becoming yellowish brown from handling; context solid or firmly stuffed, white, with scattered rusty brown stains in bulb, with larva tunnels becoming brown in bulb; partial veil superior, pendent, white to pale yellow, membranous, persistent; universal veil as limbate volva on bulb top with distinct separation from stipe base, white, becoming yellow-brown from handling or developing reddish brown fibrils on exterior surface.
KOH - negative on pileus context.
34 - 54 × 10.2 - 13.2 µm, dominantly 4-, occasionally 2- or 1-sterigmate, with sterigmata up to ?? × ?? µm; clamps not observed.
[40/2/2] (6.0-) 6.9 - 10.5 (-11.0) × (5.2-) 6.6 - 10.0 (-10.2) µm, (L = 9.1 - 9.2 µm; L’ = 9.1 µm; W = 8.4 - 8.6 µm; W’ = 8.5 µm; Q = 1.03 - 1.16 (-1.19); Q = 1.07 - 1.08; Q’ = 1.07), hyaline, colorless, thin-walled, smooth, amyloid, globose to subglobose, occasionally broadly ellipsoid, usually at least somewhat adaxially flattened, with immature spores more often ellipsoid to lacrimoid to langeniform; apiculus sublateral, truncate-conic to cylindric; contents granular to multi- or (dominantly) monoguttulate; color in deposit not recorded.
Solitary. At 700 m elev. In duff.
U.S.A.: WASHINGTON—Clallam Co. - Olympic Nat. Pk., 22.5 km WSW of Port Angeles, about 2.4 km up Boulder Crk. Tr. (closed portion of Olympic Hot Springs Rd.), Hell Crk. study site, 22.ix.1993 T. O’Dell 1785 (WTU), 28.ix.1993 T. O’Dell 1794 (WTU).
—R. E. Tulloss
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Spore data for collections provisionally identified as: Amanita sp-NW10 Tulloss
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.
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(which may be valuable for instructional purposes, for example) and may obscure instances in which
a single collection inadvertently contains a mixture of taxa.