This species has no distinct odor, and no taste was recorded.
Spores of the present species measure (7.7-) 8.0 - 9.8 (-10.3) × (4.8-) 5.0 - 6.0 (-6.6) μm and are ellipsoid to elongate and amyloid. Clamps are absent from bases of basidia.
This species is known from a single collection made in Spruce-Pine forest on the La Malintzi volcano in the state of Tlaxcala, Mexico.—R. E. Tulloss
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The following material is based upon original research by R. E. Tulloss and C. Rodríguez Caycedo.
49 mm wide, yellow-brown to orange-brown (ca. 5C8), virgate with darker brown radial lines, with disc more yellow than remainder, plano-convex with slightly flattened disc, tacky, subshiny; context brownish yellow under pileipellis in disc, otherwise white, with watersoaked line along contact with lamellae, no color change when cut or bruised, 4 mm thick over stipe, thinning evenly to margin; margin nonstriate, nonappendiculate; universal veil as yellow flocculose warts, friable, detersile, without observable color change.
free to very narrowly adnate with very fine decurrent line on stipe apex (10× lens), crowded, in mass yellow near pileus margin and otherwise yellowish cream, in side view yellowish white near pileus margin, otherwise white, staining or bruising not observed, 4 - 4.5 mm wide, broadest between half and three-quarters from stipe to margin, not forking; lamellulae predominantly attenuate, with only shortest truncate or rounded truncate, plentiful, unevenly distributed, of diverse lengths.
52 × 8 mm, yellow above partial veil, white below partial veil, without color change due to staining or bruising, narrowing upward, flaring gradually over 10 mm at apex, with surface flocculose-fibrillose above partial veil, below with small fibrils and fine longitudinal striatulae; bulb 25 & 13 mm, narrowly napiform to subradicating; context white, except yellow near surface above partial veil, with ca. 20 mm long region at or slightly above mid-stipe tan in sole known specimen, with 2.5 mm wide central cylinder partially hollow (lacunae in lower half of stipe), with stuffing material comprising white, densely packed, longitudinally oriented fibrils; partial veil subsuperior, membranous, persistent, flaring, rather narrow, striate above, fibrillose-matted below, faintly sordid yellow, with intense yellow edge; universal veil as detersile yellow crumb-like wawrts or confluent warts or friable patches on lower stipe, also forming yellow ring around top of bulb.
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Odor indistinct. Taste not recorded.
Spot test for tyrosinase (paracresol) - positive on cut edge of pileipellis and in immediately adjacent cap context, at contact between pileus and stipe contexts, throughout most of stipe and upper bulb, on sectioned partial veil, and along edge of lamellae. Spot test for laccase (syringaldazine) - negative throughout basidiome. Test voucher: Tulloss 7-16-96-J.
[40/1/1] (7.7-) 8.0 - 9.8 (-10.3) × (4.8-) 5.0 - 6.0 (-6.6) μm, (L = 8.6 μm; W = 5.5 μm; Q = (1.36-) 1.38 - 1.72 (-1.75); Q = 1.55), hyaline, colorless, smooth, thin-walled, amyloid, ellipsoid to elongate, adaxially flattened; apiculus sublateral, cylindric; contents usually multiguttulate, with or without additional granules, less commonly monoguttulate; color in deposit not recorded.
Solitary. At 3110 m elev. In conifer duff and dark friable loam under Pinus in Abies-Pinus forest dominated by Abies.
MEXICO: TLAXCALA—Mpio. Huamantla - el Volcán La Malintzi, La Cañada Grande [19°14’45” N/ 97°59’56” W, 3110 m], 16.vii.1996 R. E. Tulloss 7-16-96-J (RET 256-1).
The present species is similar to others in the "A. flavoconia group" and could be grouped with the set of taxa in that group that have the narrowest spores: A. elongata, A. sp-10, and A. sp-36. The following figure provides comparison of the sporographs of the relevant taxa:
The virgate pattern of pigmentation in the present species is seen only in A. sp-10 among the cited taxa.
—R. E. Tulloss and C. Rodríguez Caycedo
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Spore data for collections provisionally identified as: Amanita sp-M37 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.
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a single collection inadvertently contains a mixture of taxa.