The material on which this concept is based was
originally received with the comment that it represented
A. barrowsii; however, examination of the
material shows it is quite different from the latter
species. Hence, little can be assumed
concerning the species in its fresh state.
The original color of the cap is unknown.
The cap dried to a pale brownish gray with a metallic
sheen.&nbp; The cap's margin is short striate.
Sometimes a patch of volva is left on the cap.
There are no details available regarding the gills of
Little is known of the stem except that it has no ring
and has a sack-like volva at the stem base that can
enclose as much as a third of the stem if no patch is
left on the cap.
Neither odor nor taste has been recorded for
The spores of A. sp-NM01 measure
(10.0-) 10.8 - 14.2 (-16.5) × (7.5-) 7.8 -
9.5 (-10.2) µm and are broadly
ellipsoid to ellipsoid and inamyloid.
Clamps are not found at the bases of basidia.
—R. E. Tulloss
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where data is missing or uncertain.
The following material is based on original research of R. E. Tulloss.
dimensions not described, drying pale brownish gray with metallic sheen; context not described; margin striate (rather short striae), nonappendiculate; universal veil absent or as membranous volval patch.
drying 7.5YR 6/6; lamellulae not described.
exannulate; universal veil as saccate volva, white, membranous, extending one-third of distance up stipe when no portion left on pileus.
[60/2/1] (10.0-) 10.8 - 14.2 (-16.5) × (7.5-) 7.8 -
9.5 (-10.2) µm, (L = 12.0 - 12.5 µm;
L’ = 12.2 µm; W = 8.5 - 8.6 µm;
W’ = 8.6 µm; Q = (1.22-) 1.31 - 1.61 (-1.89);
Q = 1.40 - 1.47; Q’ = 1.42), hyaline,
colorless, thin-walled, inamyloid, smooth, broadly
ellipsoid to ellipsoid, somewhat flattened adaxially,
sometimes expanded at one end, infrequently slightly
constricted; apiculus sublateral,
truncate-conic to cylindric; contents
guttulate; color in deposit not recorded.
U.S.A.: NEW MEXICO—Unkn.
Co. - unkn. loc., 3-5.ix.1988? Red
River Foray participant s.n. (RET 672-2).
This specimen was received dried by RET. There
were no associated photographs. At first, RET
considered that the original cap
color might have been orangish because the person
transmitting the material said the collection repre-
sented A. barrowsii and "had been seen by
Charles Barrows." However, the material does
not match A.
barrowsii as preserved in MICH
(collected by Barrows and identified by Dr. A. H.
Smith) and studied by RET. For example, there
is a very clear difference in spore size-shape as
illustrated in the following figure:
For the moment, it is probably best
to consider the the fresh cap color of the present
species to be unknown.
The spores of A. sp-NM01 are strongly
size and shape to those of A. pahasapaensis, which
reader may wish to review. A sporograph
comparison of the two taxa is on the A
—R. E. Tulloss
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Spore data for collections provisionally identified as: Amanita sp-NM01 Tulloss
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.