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—R. E. Tulloss
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The following material is based on original research of R. E. Tulloss.
80 - 220 mm wide, white, becoming buff, convex, becoming planar at maturity, smooth, like glove leather(?), sometimes (CMP1619) cracking deeply in disc and becoming coarsely areolate (in polygonal blocks); context white, rather thick, ??; margin nonstriate, appendiculate; universal veil as thin patches (CMP1619) or in pyramidal warts, 1 - 2 mm high over disc, friable, white at first, then with tips darkening, detersile, becoming smaller warts and then flocculence toward margin.
free to adnate, close to subcrowded, white, broad; lamellulae ??.
150± × 25± mm [with height including bulb??], white, flocculose; bulb napiform to subnapiform, radicating (sometimes deeply), ?? × 40± mm, having length up to two-thirds that of non-bulb portion of stipe; context solid, white, unchanging when cut or bruised; partial veil submembranous (breaking up rather easily), apical to superior, white, with rather coarse floccose scales below; universal veil absent (CMP0548) or as four or five thin and wandering and rather obscure concentric lines (10× lens) on hemispherical, upper portion of bulb (CMP1619).
Odor strongly of bread dough (CMP0548) or “spicy/unpleasant, like valerian root?” (CMP1061) or “not distinctive, perhaps faintly [of] chlorine” (States AEF1110). Taste not recorded.
bilateral; wcs = 55 - 70 (-85?) µm; with subhymenial base having shallow angle of divergence, with elements then sweeping up to subhymenium in broad and smooth curve, comprising filamentous undifferentiated hyphae and elongate inflated cells; filamentous, undifferentiated hyphae 2.8 - 7.5 µm, branching, sometimes with pale sordid yellowish walls, with occasional slightly inflated intercalary segmenst in central stratum (up to 9.0 (-14.0?) µm wide); inflated cells up to 55 × 14.0 µm; terminal, divergent inflated cells not observed; vascular hyphae 4.0 - 10.8 µm wide, branching, scattered, occasionally common locally, occasionally coiling; clamps not observed.
wst-near = (45?-) 60 - 70 µm; wst-far = (65?-) 75 - 85 µm; as dense branching structure comprising short uninflated and partially inflated hyphal segments and inflated cells, with basidia arising from cells of all types (but particularly from short uninflated hyphal segments), with cells below shortest basidioles aligned perpendicular to central stratum.
51 - 67 × 9.8 - 12.8 µm, ??-sterigmate, with sterigmata up to ?? × ?? µm; clamps rare.
On pileus: comprising plentiful inflated cells and common to plentiful hyphae grouped in erect clusters (subfasciculate); filamentous, undifferentiated hyphae ?? µm wide, branching, ??; inflated cells generally rather small, sometimes with wall appearing slightly thickened, pyriform to ellipsoid to broadly clavate to clavate, up to ?? × ?? µm, dominant in upper part of wart, apparently rather easily dissociated; vascular hyphae not observed; clamps not observed. On stipe base: ??.
[80/4/3] (9.1-) 9.8 - 13.8 (-16.2) × (6.2-) 6.3 - 7.8 (-9.0) µm, (L = 10.7 - 12.8 µm; L’ = 11.6 µm; W = 6.8 - 7.2 µm; W’ = 7.0 µm; Q = (1.32-) 1.43 - 2.0 (-2.21); Q = 1.53 - 1.89; Q’ = 1.67), hyaline, colorless, thin-walled, smooth, amyloid, ellipsoid to elongate, infrequently cylindric, adaxially flattened, occasionally expanded at one end, occasionally constricted; apiculus sublateral, rather small, cylindric; contents mono- to multiguttulate; color in deposit unknown.
Solitary to subgregarious. At 1700 - 2600 m elev. With Quercus or in forest comprising Abies concolor, Pseudotsuga menziesii, Pinus arizonica, P. chihuahuana, and Juniperus deppeana with specific tree association not recorded or in grassy area of open Quercus-Pinus forest or in type D habitat (see definition in Arizona-New Mexico checklist (here).
Co. - CMP site #5, 12.viii.1991 R. M. Chapman s.n.
[CMP1061] (RET 512-4); CMP site #30, 10.ix.1991 L.
Ortiz s.n. [CMP1619] (RET 512-9),
22.viii.1994 S. B. Fleming s.n. [Tulloss 8-22-94-B;
CMP3956] (RET 512-5); CMP site #33,
17.viii.1990 F. H. Nishida 4177 [CMP0548] (RET 512-10,
as “A. polypyramis”); CMP
site #37, 24.viii.1994 Al & Lori Ortiz s.n.
[Tulloss 8-24-94-N; CMP3969] (RET 513-1, nrLSU
site #38, 4.ix.1994 J. D. States AEF1110
(MICH, as “A. chlorinosma”).
A subnapiform and radicating bulb, the lack of rows of fine warts around the top of the bulb, an extremely thin pileipellis, and longer spores distinguish this species from A. polypyramis (Berk. & M. A. Curtis) Sacc. A comparison of the sporographs of the two species follows:
—R. E. Tulloss
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