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 original research of R. E. Tulloss and R. Pastorino.
80 mm wide, zonate, brownish orange over disc,
orangish over striations, otherwise pale yellowish
cream, campanulate, with distinct umbo, slightly
tacky; margin nonappendiculate, striate
(0.3R); universal veil absent.
adnexed, close to crowded, pale cream in mass, marginate, with margin dark brown in exsciccatum; lamellulae truncate to subtruncate to rounded subtruncated, of varying length (none very short, most slightly less than half length of lamellae in exsiccatum), scattered (about 4 seen on half cap).
185 × 15 mm long, narrowing upward, with pallid base color, decorated with fine orange-brown fibrils above becoming brownish gray zebroid decoration below, white inside volval sac, with surface decoration becoming darker orangish brown where handled; context hollow, with central cylinder 7 mm wide; exannulate; universal veil as saccate volva, membranous, whitish, 73 × 34 mm, with pronounced sharp expansion above narrower basal portion.
ca. 67 - 72 × 16 - 18 μm, 4-sterigmate; clamps not
[36/1/1] (9.2-) 10.5 - 12.0 (-14.2) ×: (7.5-) 8.3 - 10.0 (-10.6) μm, (L = 11.3 μm; W = 9.1 μm; Q = (1.06-) 1.14 - 1.33 (-1.60); Q = 1.24), hyaline, colorless, thin-walled, smooth, inamyloid, subglobose to broadly ellipsoid to ellipsoid, adaxially flattened; apiculus sublateral, cylindric, proportionately broad; contents multiguttulate, with many additional small granules; white in deposit.
Solitary. At 80 - 250 m alt.
In forest dominated by Picea sitchensis.
U.S.A.: OREGON—Curry Co.
- Brookings [42.1059° N/ 124.3418° W, 84 m], 4.x.2007
Ronald Pastorino 10-4-07B [mushroomobserver
(RET 629-3, nrITS & nrLSU seq'd.), 10-4-07D
(RET 417-10, nrITS seq'd.); Samuel H. Boardman
St. Pk. [42.1366º N/
124.3531º W, 250 m], 24.ix.2013 R. Pastorino
(RET 571-6, nrLSU seq'd.).
The colors of the pileus disc and over the marginal striations suggest the colors of the crocea-like North American species, although none of these is known to have a zonate pileus. The subglobose to broadly ellipsoid spores, as found in the present species, are also found in taxa morphologically related to A. crocea.
In addition, the spore size and shape suggest
However, a zonate pileus has not been previously
reported for that species. In addition,
sp-OR01 has proportionately longer marginal
striations, a markedly umbonate pileus, and
orangish fibrils covering much of the stipe.
All of which are lacking in A.
From a molecular points of view (based on three
samples), the nrLSU sequence is completely constant
for a length of 1300 to 1400 characters. The
last ca. 60 characters contain an unhomogenized
region of ca. 43 characters before a final string of
ca. 17 characters that are homogenized occurs prior
to the 5' motif of 5.8S. This latter zone may show
some variation because of variability in the lengths
of two rather long multi-"A" repeats.
—R. E. Tulloss and R. Pastorino
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Tulloss & Pastorino
1. Amanita sp-OR01, Samuel H. Boardman St. Pk., Curry Co., Oregon, U.S.A. (RET 571-6)
2. Amanita sp-OR01, Samuel H. Boardman St. Pk., Curry Co., Oregon, U.S.A. (RET 571-6)
3. Amanita sp-OR01, Samuel H. Boardman St. Pk., Curry Co., Oregon, U.S.A. (RET 571-6)
4. Amanita sp-OR01, Samuel H. Boardman St. Pk., Curry Co., Oregon, U.S.A. (RET 571-6)
Ronald Pastorino - (1-4) Samuel H. Boardman State Park, Curry County, Oregon, U.S.A. [Note: Full size original photographs can be found on mushoroomobserver.org.]
Spore data for collections provisionally identified as: Amanita sp-OR01 Tulloss & Pastorino
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.