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 the collector's notes and photographs and original research of RET.
??, pale gray to silvery gray, becoming broadly convex; context white to off-white dark gray below pileipellis, proportionately thick over stipe; margin striate (0.2 - 0.25R), becoming rimose in only known specimen; universal veil as irregular common submembranous patches, stretched by pileus expansion, becoming ochraceous.
??, striate at the apex in region of pale gray to gray surface pulverulence; context ??; exannulate; universal veil submembranous, saccate, constricted, flaring above, gray on inner surface.
On pileus, interior: filamentous undifferentiated hyphae ?? μm wide, with somewhat thickened walls, irregularly disposed, sometimes abruptly curving up to 180°; inflated cells dominating, terminal singly, with walls somewhat thickened
Solitary. Under Interior Live Oak (Quercus wislizenii).
CALIFORNIA—Contra Costa Co. - Briones
Reservoir [37.9214° N/ 122.197° W, 274 m], 15.i.2018
Ben Anderson s.n. [mushroomobserver.org
(RET 822-9, nrITS &nrLSU seq'd.);
Huckleberry Preserve (East Bay Regional Parks) [ca.
37.8423° N/ 122.190° W, ca. 279 m], 18.iv.2008
Debbie Viess s.n. [mushroomobserver.org
(RET 583-2, nrITS & nrLSU seq'd.).
This collection was originally determined to be
A. protecta and was detected as distinct by
comparison of sequences of the nrITS locus.
We provide comparison of the sporographs of the two
species below. One should be cautious about this
comparison because the number of spores found on the
single specimen of the present species represent a
very small sampling. Moreover, the specimen
is immature; most of the hymenium was not yet
bearing spores when the basidiome was
—R. E. Tulloss & D. Viess
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can be found here.
Tulloss, S. D. Russell & D. Viess
1. Amanita calisorora, Huckleberry Preserve, Contra Costa Co., California, USA. (RET 583-2).
2. Amanita calisorora, Huckleberry Preserve, Contra Costa Co., California, USA. (RET 583-2).
3. Amanita calisorora, Huckleberry Preserve, Contra Costa Co., California, USA. (RET 583-2).
4. Amanita calisorora, Huckleberry Preserve, Contra Costa Co., California, USA. (RET 583-2).
5. Amanita calisorora, Huckleberry Preserve, Contra Costa Co., California, USA. (RET 583-2).
Debbie Viess - (1-5) Huckleberry Preserve, Contra Costa County, California, USA. [Original images available on mushroomobserver.org (here).]
Spore data for collections provisionally identified as: Amanita calisorora Tulloss, S. D. Russell & D. Viess
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.