The following text may make multiple use of each
The field may contain magenta
text presenting data from a type study
and/or revision of other original material cited in
the protolog of the present taxon.
Macroscopic descriptions in magenta are a
combination of data from the protolog and
additional observations made on the exiccata during
revision of the cited original
The same field may also contain black text, which
is data from a revision of the present
taxon (including non-type material and/or material
not cited in the protolog).
Paragraphs of black text will be labeled if further
this text is appropriate.
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.
Information below is from examination of dried
basidiomes, genetic studies by L. V. Kudzma, and
other original research of R. E. Tulloss.
margin nonappendiculate, short striate;
universal veil not present.
universal veil as robust saccate volva, often
with rusty stains, with volva sometimes separated
into membranous or submembranous fragments by
basidiome expansion, sometimes with these fragment
become brown or sordid.
[80/4/3] (9.6-) 10.1 - 14.0 (-15.0) × (7.5-) 8.8 -
12.5 (-13.5) μm,
(L = 11.2 - 12.3 μm; L' = 11.7 μm;
W = 9.9 - 11.0 μm; W' = 10.3 μm;
Q = (1.04-) 1.06 - 1.25 (-1.39); Q = 1.11 -
1.15; Q' = 1.13), hyaline, colorless, smooth,
thin-walled, inamyloid, subglobose to broadly
ellispoid to (infrequently) ellipsoid, adaxially
flattened, sometimes narrowing toward one end;
apiculus sublateral, cylindric;
contents guttulate; color in deposit not
At ca. 2590 m elev. In grove of Populus tremuloides or with
Pop. tremuloides and Pinus ponderosa.
ARIZONA—Coconino Co. - San Francisco
Peaks, 30.viii.1994 Jack S. State AEF 1089 (MICH
on extended loan to RET, nrITS & nrLSU seq'd.),
31.viii.1994 Jack S. States AEF 1093 (MICH on extended
loan to RET, nrITS seq'd.), AEF 1095 (MICH on extended
loan to RET, nrITS & nrLSU seq'd.), AEF 1096 (MICH on
extended loan to RET, nrITS & nrLSU seq'd.).
COLORADO—Gunnison Co. - Crested
Butte, summer.2003 Larry Evans s.n.
(RET 372-8, nrITS & nrLSU seq'd.).
We were able to segregate this taxon using nrITS and
Unfortunately, we have little information about
characters observed on fresh material.
the packets indicate that photos were taken of
AEF1093 and AEF1096. Some caps have retained
an orangish tint.
The basidiomes can be rather large and have some
rusty stains on the cupulate or saccate or
fragmented volva that are reminiscent of of species
nishidae, and A. populiphila.
A recent nrLSU trees of the Vaginatae
included the present species as sister to a small
grouping including branches representing
A. sp-MN03 and
populiphila. The hypothetical
to A. populiphila is interesting because at
least one specimen of the present species (RET 372-8)
mistaken for A. populiphila on morphological
grounds. This is further evidence that the cap
of A. sp-AZ28 is off-white and may have a tendency
to stain orangish or rusty and that the volva of the
latter species is friable and stains as the cap
A comparison of the spores of the present species to
those of A. populiphila and A. sp-MNO3
—R. E. Tulloss
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Tulloss, Kudzma, & States
Spore data for collections provisionally identified as: Amanita sp-AZ28 Tulloss, Kudzma, & States
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.