Olive text indicates a specimen that has not been
thoroughly examined (for example, for microscopic details) and marks other places in the text
where data is missing or uncertain.
The following material is based on molecular research of
Dr. L. V. Kudzma and other original research of R. E.
Basidiome medium-sized with proportionately short stipe.
60 - 79 mm wide, fuligneous over disc and pale
grayish brown toward margin or entirely dark brown,
sometimes with scattered depigmented spots;
convex to planar to planoconcave, becoming depressed
over disc, tacky when moist; context not
margin nonappendiculate, striate (0.25-0.35R);
universal veil often absent, infrequently present as small patches or flat warts, whitish at first, becoming orangish brown with exposure and drying.
free with decurrent line on upper stipe, crowded,
whitish in mass, whitish to buff in side
view, drying slightly orangish yellow-tan, sometimes
pigmented edge near pileus margin, otherwise with
pallid minutely fimbriate edge, with pileus under
surface between lamellae drying pale orangish cream;
lamellulae truncate to rounded truncate to
subattenuate, predominately with lengths between
one-quarter and one-half of pileus radius,
infrequently extremely short, unevenly distributed
between pairs of otherwise adjacent lamellae.
Up to 123 × 17 mm long, narrowing upward;
context sometimes partially hollow;
universal veil as saccate membranous volva,
whitish on inner and outer surfaces, with upper edge
of sac becoming rust brown or orangish brown with age
[40/2/1] (10.2-) 10.6 - 15.1 (-16.9) × (8.5-)
8.7 - 11.2 (-12.0) μm, (L = 12.2 - 12.5 μm;
W = 9.8 - 10.0 μm; Q = (1.09-) 1.13 - 1.42
(-1.54); Q = 1.24 - 1.25), hyaline, colorless,
smooth, thin-walled, inamyloid, subglobose to broadly
ellipsoid to ellipsoid, with immature spores often
elongate to cylindric or bacilliform or clavate or
constricted or sigmoid or gourd-shaped or otherwise
of uneven outline, with scattered giant spores present
on both immature and mature lamellae; apiculus
sublateral, subcylindric to cylindric; contents
monoguttulate with additional small granules; white
California: In woods including Pinus radiata,
Quercus agrifolia, Cupressus macrocarpa
and introduced Eucalyptus.
Montana: Scattered. In grassy area ca. Picea
engelmannii & Pseudotsuga menziesii.
Washington: In small groups. At ca. 1200 m
elev. In clearings by lake with Tsuga and
CALIFORNIA—Alameda Co. - Berkeley,
Strawberry Canyon [37.8740° N/ 122.239° W, 218 m],
17.i.2018 Ben Anderson s.n. [mushroomobserver
(RET 822-4, nrITS-LSU seq'd.).
Del Norte Co. - Tolowa
Dunes St. Pk. [41.8542° N/ 124.2116° W, 7 m],
4.xii.2018 Ron Pastorino 12-4-18D
(RET 861-1, nrITS & nrLSU seq'd.).
MONTANA—Gallatin Co. - New World
Gulch, 9.vii.2012 Ed Barge 0095 [mushroomobserver
(RET 503-8, nrITS-LSU seq'd.).
WASHINGTON—Pend Oreille Co. - Metalene
Falls, 23.v.1996 PNW Key Council member s.n.
[Janet E. Lindgren 96-06] (RET 279-7,
nrLSU seq'd.). Skamania Co. - GPNF,
Big Mosquito Lk. [46.128° N/ 121.758° W, 1189 m],
11.viii.2013 Sava Krstic SAK-2013-0811-3
(RET 573-1, nrITS & nrLSU seq'd.).
There are four specimens in Krstic SAK-2013-0811-3.
These were labeled A through D by RET. Much of the
lamella surface in the section reviewed of basidiome "A"
was immature. The hymenial surface of basidome "b"
was mature. Spore shape was highly irregular and
highly variable in both specimens as noted above in the
"basidiospores" data field. It is very unusual (but
not unknown) for spores of an Amanita to be
elongate (have higher Q value) in the
than in the mature condition. High variation in
shape may be an indication of influence of an
environmental factor on the normally rather regular
process of Amanita spore production. For
example, the irregularly shaped spores in the
collection of A. lactea were not found in other
collections of that species. In the present case,
of additional basidiomes is necessary.
In the material examined molecularly, we failed to
obtain data in a region between the ?? and ?? primer
sites in the nrLSU gene. in an alignment of
our two complete fragments with a randomly selected
group of other sequences from taxa of section
Vaginatae sharing the "TTTGACCTCAAATCA" 5'
motif for nrLSU, we found the gap region to be
around 180 character positions long.
This taxon was previously called
"Amanita sp-WA03" in these pages.
—R. E. Tulloss
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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.