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30 - 38 mm wide, pale yellowish or duller and paler than A. velosa and without a pink tint, glabrous, silky smooth; context ??; margin striate (0.2 - 0.25R), incurved, nonappendiculate; universal veil absent or as patch roughly over disc and then large, white, membranous.
free with line on stipe apex, moderately crowded, yellow to pale cream to whitish; lamellulae truncate, in one to three tiers, with many having length equal to about 0.5R in exsiccatum, very infrequent in some sectors.
50 - 80 × 6 - 8 mm, cream to pale yellowish white, narrowing upward, rounded or somewhat pointed at base; context nearly completely hollow; exannulate; universal veil as saccate volva, white, membranous, narrow, with limb enclosing one-third to one-half of stipe if none left on pileus, with uneven limbs, sometimes with half or more of limb adnate, with tissues remaining whitish in exsiccatum and (in longitudinal section) distinct from pale orangish tan tissue of stipe even at very base of stipe, with short limbus internus at point of attachment of limb or slightly above, no longer discernible in exsiccatum or rather small.
comprising gelatinized colorless suprapellis 45 - 100 µm thick and ungelatinized yellowish to orange-brown or yellow-brown subpellis 95 - 125 µm thick; filamentous, undifferentiated hyphae 2.2 - 6.0 µm wide, criss-cross interwoven, rather densely packed, branching, sometimes constricted at septa; vascular hyphae 4.2 - 14.0 µm wide, most easily seen in scalp section, infrequently branching, scattered, locally common, found in both suprapellis and subpellis.
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bilateral, with shallow angle of divergence, with plentiful branching short-segmented hyphae in subhymenial tree, with some ellipsoid to ovoid to subglobose cells (up to 27 × 15.8 µm) in subhymenial base sometimes perpendicular to central stratum; wcs = (25-) 40 - 50 µm; filamentous, undifferentiated hyphae 2.5 - 6.8 µm wide, branching, sometimes constricted at septa, with many intercalary subellipsoid cells (some times in chains); terminal, divergent inflated cells not observed; vascular hyphae not observed.
wst-near = (20-) 25 - 45 µm; wst-far = (30-) 50 - 80 µm; ramose, with basidia arising from short uninflated hyphal segments or (infrequently) from small inflated cells (subglobose to ellipsoid, up to 11.2 × 7.8 µm), with two to three cells below basidial base having major axes perpendicular to central stratum.
41 - 70 × 8.8 - 13.5 µm, 4-sterigmate; clamps lacking or very rare.
On pileus: absent or deteriorated. On stipe base, exterior surface: thin scant layer of filamentous, undifferentiated hyphae partially gelatinized. On stipe base, interior: filamentous, undifferentiated hyphae 1.5 - 13.0 µm wide, branching, dominating, with individual hyphae and fascicles interwoven loosely, locally loosely coiling, sometimes slightly constricted at septa, with walls thin to slightly thickened (<0.5 µm thick); inflated cells scattered, terminal singly, narrowly clavate to clavate to broadly clavate (up to 97 × 34 µm, sometimes rostrate, with thin or slightly thickened walls) or ellipsoid to ovoid to subglobose (up to 69 × 50 µm, sometimes rostrate, infrequently with walls to 0.8 µm thick, at times in loose clusters); vascular hyphae not observed. On stipe base, inner surface: ??.
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[81/2/2] (10.0-) 10.8 - 13.8 (-17.5) × (5.8-) 6.5 - 9.0 (-13.0±) µm, (L = 11.7 - 12.6 µm; L’ = 12.1 µm; W = 7.3 - 7.9 µm; W’ = 7.6 µm; Q = (1.23-) 1.43 - 1.84 (-2.28); Q = 1.60; Q’ = 1.60), hyaline, colorless, thin-walled, smooth, inamyloid, ellipsoid to elongate, rarely cylindric, rarely broadly ellipsoid, adaxially flattened, occasionally expanded at one end, rarely subtriangular in lateral view; apiculus sublateral, cylindric, rather small to prominent; contents monoguttulate with or without additional small granules, occasionally multiguttulate; color in deposit unknown.
Solitary or paired at ?? - 1650 m elev. Arizona: With with Quercus arizonica, Q. hypoleucoides, Q. emoryi, Pinus leiophylla, P. engelmannii, Juniperus deppeana, Platanus wrightii, Pseudotsuga menziesii, Juglans major, P. discolor. Baja California: With Quercus agrifolia.
MÉXICO: BAJA CALIFORNIA—Rancho la Cruz, 7.i.1986 Ochoa 312 (BCMEX 02449 as "Amanita alba [sensu Thiers (1982)]"). U.S.A.: ARIZONA—Cochise Co. - CMP site #13, 23.viii.1991 L. Ortiz s.n. [CMP1260] (LAM as "A. velosa"; RET); CMP site #24, 29.viii.1993 F. H. Nishida s.n. [CMP3042] (LAM).
This taxon can be separated from A. velosa by the ellipsoid to elongate spores, the lack of a patch of universal veil on the pileus, etc.
—R. E. Tulloss
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Spore data for collections provisionally identified as: Amanita sp-AZ15 Tulloss
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