Summary:
Subgenus Validae. Distinguishing features include whitish to pinkish powdery young cap and stem that bruise pinkish to reddish brown. Amanita novinupta group is uncommon. There are two species, Amanita novinupta and Amanita cruetilemurum nom. prov., shown with accumulating data on the website Tulloss(6).

Cap:
3-15cm broad, hemispheric at first, then convex to flat; "white with a pink or rosy tint beneath the surface, may become brownish in dry weather"; surface chalky or powdery becoming smoother or cracked when old, margin without striations, sometimes appendiculate with marginal remnants, (Lindgren), (1)3.1-11(15)cm across, hemispheric at first, then convex to flat-convex to flat, occasionally (at any stage) with depressed disc, margin inflexed at first, later decurved [downcurved]; white at first, then white with a pink tint that at times seems to be below the surface, then ivory to light tan or white with a faint tan or light tan disc, often with a pink blush, staining pale pinkish brown or pale wine, and finally red-brown, occasionally flecked with gray when old; dry, at first with chalky or pulverulent [powdery] appearance, "later dull to shiny or satiny in older specimens", small subpyramidal warts or nearly confluent and rather thick patches, soft and cottony when fresh, with fibrillose to striate-eroded sides after exposure, becoming fine scales toward margin when old, universal veil white at first, then pale pinkish or pale pinkish beige, becoming more pink on bruising, brown when old, margin not striate, occasionally appendiculate with crumbs or flakes or shreds of partial veil, (Tulloss(2))

Flesh:
white, worm holes becoming reddish brown, (Lindgren), 0.4-1.4cm thick at stem, thinning evenly to margin; white, bruising slowly red brown to red to wine or (despite marked changes in surface of cap and stem) scarcely becoming pink or not changing, in stem white to off-white, bruising as elsewhere or light to medium red brown with lower bulb occasionally showing no reaction or bruising deeper brown than the remainder of the stem flesh, (Tulloss(2))

Gills:
close to crowded, plentiful subgills; "white to off-white, becoming pinkish when bruised", (Lindgren), narrowly adnate to free, with short-decurrent line, close to crowded, 0.3-1.1cm broad, broadest at a point 3/4 of way from stem, plentiful subgills of various lengths, truncate, subtruncate, rounded truncate or attenuate, gills rarely forking; off-white to pale cream to pale grayish white, becoming pinkish when bruised, (Tulloss(2))

Stem:
2-15(18)cm x 1-3.5(5)cm, "white bruising pink, rose or brown"; "powdery, often with scales and cracking", (Lindgren), 2-15(18)cm x 1-3.2(5.1)cm, widening downward, sometimes flaring at top, solid or stuffed, bulb ellipsoid to turnip-shaped or rooting; white, bruising or staining as cap, often pinkish to some degree when collected; with fibrillose-floccose to floccose to squamulose decoration, more or less longitudinally striatulate, often with recurved scales, (Tulloss(2)), VOLVA often not well defined, rings or patches on a slightly enlarged base, often staining similarly to stem, (Lindgren), first often as a narrow and well-defined limb at juncture of stem and bulb, later as a few concentric rings of small warts on lower stem and upper part of bulb or as faint cottony material on lower stem or not evident, almost always left in substrate at least in part; white, then staining as on cap, (Tulloss(2))

Veil:
partial veil membranous, forming persistent, superior, skirt-like ring, usually with reddish tints, (Lindgren), universal veil as small subpyramidal warts or as nearly confluent and rather thick patches, and forming volva; partial veil forms persistent, apical to superior, membranous, skirt-like, white ring, sometimes with reddish tints, with pinkish tan or brownish particles or thickened warts at edge, striate to faintly striate on upper surface, cottony fibrillose or floccose-felted on undersurface, collapsing on stem when old, (Tulloss(2))

Odor:
faintly fungoid (Lindgren), faintly fungoid, "normal agaric", or mild, (Tulloss(2))

Taste:
not distinctive, (Lindgren), "normal agaric" (Tulloss(2))

Microscopic spores:
spores (6.2)8.2-10.8(14.8) x (4.2)5.5-7.2(8.8) microns, elliptic, occasionally broadly elliptic or elongate, rarely cylindric, smooth, amyloid, thin-walled, contents mono- or multiguttulate to granular; basidia 4-spored or occasionally 2-spored, 34-49(67) x 8.5-12.5(21) microns, thin-walled; some clamp connections, (Tulloss(2))

Spore deposit:
white (Tulloss(2))

Notes:
Collections identified as Amanita novinupta were examined from BC, WA, OR, ID, AZ, CA, and NM, (Tulloss(2)), and New York Botanical Garden has collection from Mexico. The range is given as southwestern Canada to central Mexico (Tulloss(5)). Some of these may prove to be Amanita cruetilemurum.

EDIBILITY

unknown (Lindgren)