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Data presented on this tab comes from original research by R. E. Tulloss
50 mm wide, gray-brown, drying coppery or reddish brown, convex planar; context white, thin; margin decurved, sulcate-striate to striate (0.2±R), nonappendiculate; universal veil as a single large calyptra, white, developing rusty orange stains, becoming sordid cream to brownish cream to brownish gray when dried, membranous to submembranous.
free to barely adnate, white, drying reddish brown, with white and minutely fimbriate edge; lamellulae not located.
89+ - 100 × 7± mm, pale gray and finely pulverulent near apex, with a pallid ground and pale brown fibrils below, pallid at top and otherwise red-brown as dried, narrowing upward; context pallid and hollow in exsiccata; exannulate; universal veil as a strangulate or tightly-appressed saccate volva, pale orangish white, rusty orange stains throughout, not gray on interior surface, pallid with gray-brown edge to limb in exsiccata, highest point on limb 40± mm from base of stipe.
filamentous, undifferentiated hyphae 1.2 - 7.5+ µm wide, branching, plentiful, occasionally in fascicles, loosely interwoven among acrophysalides; acrophysalides dominating, terminal, with walls thin or slightly thickened, clavate to subfusiform to ellipsoid to subglobose, up to 135 × 52 µm; vascular hyphae 2.8 - 10.2 µm wide, with irregular outline, sometimes loosely coiling.
bilateral, with central stratum rehydrating very poorly and brown to orange-brown, with wcs = 45 - 55 µm in this poorly rehydrated state; subhymenial base dominated by inflated cells (up to 40 × 23 µm, thin-walled, with major axis at angles up to 90° to the central stratum); filamentous, undifferentiated hyphae 2.8 - 10.5 µm wide, branching; divergent, terminal, inflated cells not observed; vascular hyphae 1.5 - 12.0 µm wide, infrequent, sinuous, branching, with branching points sometimes greatly swollen with respect to diameters of branches.
wst-near = (20-) 25 - 40 µm (imperfectly rehydrated); wst-far = (35-) 60 - 75 µm (imperfectly rehydrated); with plentiful inflated cells (globose to subglobose to irregular) in branching structure interwoven with some branching hyphae, with 4 to 5 cells between central stratum and bases of basidia, with 1/2 to 2 1/2 (to 3 1/2) cells between base of small basidiole and base of largest nearby basidium/-ole, with basidia arising commonly from inflated cells, but also commonly from uninflated hyphal segments.
On pileus, upper surface: orange-brown in intensively gelatinized areas. On pileus, interior: filamentous, undifferentiated hyphae 1.8 - 11.2 µm wide, dominating, branching, with some intercalary clavate segments, with occasional inflated branch cell (e.g., 19.0 µm wide), interwoven (sometimes densely), twisting, often in fascicles, without dominant orientation; inflated cells terminal, singly or in short chains (up to 4± cells long), plentiful to locally dominant (in clusters), hyaline to very slightly sordid to faintly brownish (possibly due to gelatinization), mostly thin-walled, with a few smaller cells having walls up to 0.5± µm thick, not dissociating, subglobose or broadly ellipsoid (up to 56 × 45 µm) to ellipsoid or elongate-cylindric (up to 65 × 51 µm) to broadly clavate or clavate (up to 84 × 42 µm) to narrowly clavate (up to 120 × 36 µm); vascular hyphae not observed; clamps occasional to plentiful. On pileus, lower surface: like interior, but more gelatinized. On stipe base: tissues collapsed throughout and partially gelatinized at surfaces; filamentous, undifferentiated hyphae 2.8 - 8.0 µm wide, frequently branching, dominating in much of the issue, otherwise plentiful, often in fascicles, very densely interwoven in some regions, with branched elements sometimes inflated; inflated cells hyaline to sordid to very pale brownish, plentiful to locally dominant (in clusters), terminal, singly or in short chains, thin-walled, broadly ventricose to broadly clavate to ellipsoid to broadly ellipsoid to subglobose, up to 59 × 43 µm; vascular hyphae 3.5 - 4.5 µm wide, very scarce; clamps present, but difficult to locate because of collapsed state of tissue.
longitudinally acrophysalidic; filamentous, undifferentiated hyphae 1.8 - 16.1 µm wide, branching, plentiful; acrophysalides up to 269 × 49 µm, plentiful, thin-walled; vascular hyphae 4.6 - 19.0 µm wide, infrequently branching, common to locally plentiful, sinuous, occasionally loosely coiling; clamps present.
[60/2/2] (8.8-) 9.8 - 12.8 (-18.5) × (7.8-) 8.0 - 11.0 (-13.0) µm, (L = 10.9 - 11.7 µm; L’ = 11.2 µm; W = 9.5 - 10.2 µm; W’ = 9.8 µm; Q = (1.02-) 1.07 - 1.27 (-1.42); Q = 1.15; Q’ = 1.15), hyaline, thin-walled, smooth, inamyloid, globose to subglobose to broadly ellipsoid, adaxially flattened, sometimes expanded at one end; apiculus sublateral, cylindric, often prominent; contents monoguttulate, sometimes with a few additional small granules; color in deposit unknown.
Solitary under Quercus in California. Solitary in conifer duff at 1200 m elev. in Washington.
U.S.A.: CALIFORNIA—Santa Barbara Co. - SE of Santa Ynez, Lk. Cachuma, 29.i.1967 G. A. Breckon & H. D. Thiers [Breckon 684] (SFSU as a paratype of A. constricta).
OREGON—Clackamas Co. - MHNF, Bull Run, Sect. A Chanterelle Study Plots, 30.vii.1993 Janet E. Lindgren 93-17 (RET 097-9).
WASHINGTON—Skagit Co. - Mt. Baker Nat. For., ca. Rainbow Falls, above Baker Lk., 22.ix.1991 B. McAdoo 193#17 (RET 050-1).
This taxon’s description is largely based on Breckon 684 although the first specimen seen was McAdoo 193#17. The latter is in poor condition with many cell walls somewhat gelatinized.
The species is segregated from Amanita constricta because of that species’ more limited number of inflated elements in the subhymenium, (apparently) deeper subhymenial tree, lack of graying in the universal veil (specifically noted in field notes on McAdoo 193#17), and the tendency to leave universal veil on the pileus as a large calyptra.
This species is separated from A. species NW4 because of that species’ having only scattered clamps at the bases of basidia, dominantly thick-walled cells in the universal veil, longer marginal striae on the pileus margin, some acrophysalides of the stipe context with walls up to 1.0 µm thick, and slightly larger and slightly more globose spores. It was also observed that vascular hyphae were present throughout most tissues of the present species, but present only in the pileus and and the stipe context of A. species NW4. Moreover in the latter tissue vascular hyphae were scarce.
—R. E. Tulloss
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Spore data for collections provisionally identified as: Amanita sp-NW05 Tulloss
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