The following is based on original research of R.E. Tulloss.
The pale yellow to brown cap is 30-78 mm wide and sometimes has a brownish gray ring on the grooved edge. The center of the cap is faintly yellow-brown to pale pink and sometimes is faintly streaked radially when viewed with a 10× lens. The cap is bell-shaped to slightly convex with a distinct broadly rounded knob. The cap's flesh is white to off-white and there is a gray line where the gills attach. The flesh is 4 - 7.5 mm thick above the stem, thins evenly for most of the radius, and then is membranous to the edge. The cap's edge is grooved and volval remnants are absent.
The off-white to cream gills are free and rather distant from the stem and are connected to the top of the stem by faint descending lines on the upper stem. They are close to crowded, 5 - 5.5 mm broad, and infrequently fork or form traverse connections. The unevenly distributed short gills are cut off squarely, are of diverse lengths, and are plentiful.
The pale gray to off-white stem is 117 - 120 x 10 - 12.5 mm and becomes faintly yellow-
brown when handled and with age. The stem narrows upward and flares somewhat at the
top. At first the top of the stem is decorated with fine tufts and the bottom is silky and shiny; with age the stem becomes bald with a few fibers in the lower half. The stem's flesh is white to pale cream, and is faintly gray at the base of the stem where it
attaches to the volva. The stem is stuffed loosely with white fibers in a central
cylinder 3 - 4.5 mm wide. The volva is saclike and tube-shaped with many yellow-brown spots and stains on the lower half of the outside. The volva is white on its interior surface and is 48 - 60 x 19.5 - 28 mm and up to 1 mm thick. A small internal limb (often disappearing in age) is present just above the point of attachment of the volva to the stem.
The odor of this mushroom is not distinctive. The taste has not been recorded.
The spores of this mushroom are (10.5-) 10.8 - 13.5 (-16.5) × 10.0 - 12.5 (-14.2) µm, inamyloid, and globose to subglobose. Clamps are probably rare or absent at bases of basidia.
This species were found growing solitarily at an elevation of 2500 m in loam and litter
under varied Fir species including White Fir (Abies concolor), Aspen (Populus
tremuloides,), Douglas Fir (Pseudotsuga menziesii ), and Arizona Pine (Pinus
arizonica). Of the Arizona code-named taxa, this appears to be most similar to
Amanita sp-AZ03.—R. E. Tulloss and N. Goldman
Tulloss cryptonom. temp.
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The following is based upon original research by R. E. Tulloss.
30 - 78 mm wide, pale straw color, getting brownish tint with age, with or without brownish gray ring on inner ends of striae, faintly ochraceous to pale pinkish brown over disc, sometimes faintly virgate (lens), campanulate to planoconvex with distinct umbo, subshiny, dry; context white to off-white, with or without thin gray line at lamella attachment, faintly pinkish brown tint in umbo, unchanging when cut or bruised, 4 - 7.5 mm thick at stipe, thinning evenly for four-fifths of radius or nearly all of radius then a membrane to margin; margin striate (0.15 - 0.4R), nonappendiculate; universal veil absent.
free to receding, with faint decurrent line on stipe (lens), close to subcrowded to crowded, off-white or brownish (in age) in mass, white to off-white or pale cream (in age) in side view, unchanging when cut or bruised, 5 - 5.5 mm broad, infrequently forking, infrequently anastomosing; lamellulae truncate to subtruncate to rounded truncate, unevenly distributed, of diverse lengths, plentiful.
117 - 120 × 10 - 12.5 mm, pallid to whitish to off-white, becoming straw color to pale umbrinous to brown to faintly ochraceous brown where handled and in age, narrowing upward, distinctly to barely flaring at apex, at first flocculose near apex and silky-shiny below, becoming nearly glabrous (matt below annulus and subshiny above it) with few fibrils in lower half; context white to pale cream, sordid below in age, faintly grayish at interface between stipe and universal veil, unchanging when cut or bruised, stuffed with loosely packed white fibrils, with central cylinder 3 - 4.5 mm wide; partial veil as very faint ring, raised, median, white, becoming brown in age [possible misinterpretation of cracked stipe surface??]; universal veil as saccate volva, membranous, tubular, white with many ochraceous spots and stains on outside (especially in lower half), white on interior surface, becoming grayish in one specimen when crushed during sectioning, 48 - 60 × 19.5 - 28 mm, with patch (highest point 71 mm from stipe base) left on stipe overlying median ring, broadest at base or flaring near top of limb, up to 1 mm thick at mid-height of limb, with limbus internus small and just above point of attachment of volva to stipe, disappearing in age.
Odor indistinct. Taste not recorded.
obscurely bilateral; wcs = 115 - 130 µm (with some areas occasionally imperfectly rehydrating), with angle of divergence ranging from very shallow (uninflated elements) up to 90° for some inflated elements, with limits of central stratum difficult to define because of hyphae parallel to central stratum passing through subhymenial base or with subhymenial base arising within central stratum; filamentous, undifferentiated hyphae ?? µm wide, densely packed in central stratum, frequently branching, with intercalary inflated cells fusiform to elongate to ellipsoid (up to 46 × 19.0 µm); divergent, terminal inflated cells not observed; vascular hyphae not observed.
wst-near = 20 - 40 µm; wst-far = 35 - 60 µm; with some areas imperfectly rehydrating, tangled and branching structure about 20 - 25 µm thick below longest basidia and dominantly composed of short uninflated hyphal segments and branched elements, with scattered to relatively plentiful inflated cells (clavate, ellipsoid, etc., up to 23 × 17.0 µm, but most smaller than 15.0 × 10.5 µm), with basidia arising from uninflated branched elements, partially inflated and uninflated hyphal segments and (less commonly) small inflated cells.
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.