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33 - 79 mm wide, white, with pinkish or pinkish buff or grayish or tan tint over disc, convex, becoming planar or with margin upcurved in age, with texture of kid leather and satiny sheen, dry, not tacky to lip; context
??; margin striate (0.3±R), nonappendiculate; universal veil absent or present as large thin membranous patch or patches, white at first, becoming tan on drying in situ.
??, with decurrent lines on stipe apex, close, white to pale yellowish white in mass,
?? in side view, narrow?, rather thick, with minutely flocculose white edge; lamellulae
55 - 80 × 12 - 20 mm, white, darkening slightly from handling, cylindric or narrowing upward, with surface pruinose or pruinulose and sometimes breaking up into subconcentric scales, becoming easily separable from volval sack, rounded at base like ball joint of limb bone; context white, hollow; exannulate; universal veil saccate, white inside and out at first, with exterior becoming sordid with age especially near base, otherwise lacking any spotting or bruising, membranous, but sometimes rather fragile, flaring slightly above region attached to stipe base, but remaining rather close to stipe, with limb attached to stipe for about one-third limb length.
Odor lacking or somewhat spermatic. Taste not recorded.
KOH - negative to faintly yellowish on pileus.
65 - 95 µm thick, with surface gelatinization absent or involving only upper 5 - 10 µm (and then in or near disc region), concolorous with context and sometimes difficult to distinguish from latter, with many remnants of connections to inner surface of universal veil remaining ungelatinized and projecting from surface; filamentous, undifferentiated hyphae 1.5 - 7.2 µm wide,
??, densely interwoven and criss-crossing, often fasciculate; vascular hyphae not observed.
[60/3/2] (7.9-) 10.2 - 13.5 (-16.5) × (6.3-) 6.6 - 9.0 (-10.0) µm, (L = 11.4 - 12.3 µm; L’ = 11.8 µm; W = 7.6 - 7.8 µm; W’ = 7.7 µm; Q = (1.25-) 1.37 - 1.76 (-1.85); Q = 1.49 - 1.58; Q’ = 1.54), hyaline, colorless, thin-walled, smooth, inamyloid, ellipsoid to elongate, infrequently broadly ellipsoid; apiculus sublateral, cylindric, often proportionately rather broad; contents monoguttulate to granular; white in deposit.
Scattered to subgregarious. In grass (not lawn) under Quercus garryana or in forest with Corylus cornuta, Pseudotsuga menziesii, and Q. garryana.
U.S.A.: OREGON—Benton Co. - ca. 0.4km SW of Adair Village, MacDonald For., 14.v.1995 T. O’Dell 2719 (RET 152-10; WTU?). Clackamas Co. - Gladstone, Gladstone Pk., Valley View Dr. and Oakridge Dr. 4.vii.1997 Judy Roger s.n. [J. E. Lindgren 9705] (RET 261-1).
The “kid leather” appearance of the pileus is
apparently due to ungelatinized remnants of hyphae
that once joined the pileipellis and the inner surface
of the universal veil. In many species of
Amanita these fragments are obliterated by
gelatinization of a zone separating the two
tissues. In Amanita sp-NW09, slight
gelatinization in the disc region may be sufficient to
allow the pileus to begin the rupture and spreading
of the volval sac; however, over much of the surface
the formerly connecting hyphae seem simply to have
been ruptured leaving the projecting stubs as
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.