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Guzmán. 1975. Beih. Nova Hedwigia 51: pl. 27, fig. 32-36. [As A. nauseosa.]
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 not directly from the protolog of the present taxon and not cited as the work of another researcher is based on original research by R. E. Tulloss.
50 mm wide, yellow-orange over the disc, canary yellow otherwise; context ??; margin nonstriate, appendiculate; universal veil farinose, concolorous with pileus.
free, crowded, pinkish white; lamellulae attenuate, of diverse lengths, unevenly distributed, plentiful.
150 × 10 mm, whitish toward the base, cylindric, densely covered for upper two-thirds of length by floccose-farinose scales concolorous with pileus concentrated below annulus; bulb apparently lacking; context ??; partial veil apical, membranous, yellow, rather persistent, shredding or tearing, smooth above, floccose-farinose below; universal veil as flocculence below annulus in upper two thirds of stipe and as scattered crumbs or scales in lower third of stipe.
Odor not distinctive. Taste not recorded.
lacking, with pileus context divided from universal veil in some regions by slightly increased concentration of hyphae (never gelatinized and, if in continuous layer, then layer very thin).
filamentous, undifferentiated hyphae 1.5 - 8.0 (-12.0) µm wide, branching, plentiful, singly or in narrow fascicles, some with yellowish subrefractive walls (with clamps on these concolorous), often with constrictions at septa; acrophysalides plentiful to dominant, thin-walled, ellipsoid to clavate to narrowly clavate to subfusiform to narrowly fusiform, up to 145 × 28 µm; vascular hyphae 4.5 - 9.0 µm wide, branching, very infrequent; clamps scattered to relatively frequent locally, often prominent when present.
27 - 44 × 7.7 - 9.6 (-11.0) µm, 4-sterigmate, with sterigma up to 4.0 × 2.5 µm and usually rather broad for their length; clamps common, sometimes prominent, with proliferated clamps rather common.
On pileus: with elements arising from pileus context directly, with anticlinal orientation at least in basal part, becoming gelatinized on upper surface; filamentous, undifferentiated hyphae 1.8 - 5.0 (-14.6) µm wide, branching, thin-walled, scarce near surface, more common near pileus context (there scattered singly and in narrow fascicles); inflated cells in easily dissociated chains, dominating, with chains occasionally branched, with walls thin or (infrequently) up to 0.5 µm thick, ellipsoid to clavate to narrowly clavate to broadly fusiform to fusiform to subcylindric, up to 131 × 35 µm; vascular hyphae rare or absent; clamps relatively frequent on hyphae. On stipe (about midpoint): as on pileus, but with inflated cells somewhat smaller and with a larger percentage of filamentous, undifferentiated hyphae, gelatinizing extensively.
longitudinally acrophysalidic; filamentous, undifferentiated hyphae 2.0 - 3.3 µm wide, common; acrophysalides dominating, thin-walled, up to 107 × 23 µm or larger; vascular hyphae not observed; clamps not observed.
decorated with material of universal veil on underside; filamentous, undifferentiated hyphae 3.5 - 5.5 µm wide, branching, frequently in loose fascicles (many with subradial orientation), often constricted at septa, occasionally with yellowish subrefractive walls; inflated cells plentiful, thin-walled, terminal (singly or in short chains), similar in form to inflated cells of universal veil, narrowly fusiform to narrowly clavate to clavate, up to 102 × 20 µm; vascular hyphae not observed; clamps scattered (possibly difficult to see because hyphae often collapsed).
[40/2/1] (6.1-) 6.3 - 8.0 (-8.5) × (4.8-) 5.3 - 6.6 (-7.4) μm,
(L = 6.9 - 7.1 μm; L' = 7.0 μm; W = 5.9 - 6.2 μm; W' = 6.0 μm; Q = (1.07-) 1.08 - 1.27 (-1.30); Q = 1.16 - 1.17; Q' = 1.17),
hyaline, colorless, smooth, thin-walled, amyloid, globose to subglobose to broadly ellipsoid, often at least slightly flattened adaxially; contents granular to multiguttulate; apiculus sublateral, cylindric; ?? in deposit.
Paired. Mexico: At 300 m elev. "Selva mediana."
GUERRERO—Mpio. Tierra Colorado, a 16 km de Tierra Colorado rumbo al tabacal, 4.vii.1981 M. Villegas Ríos 146 (FCME).
This species belongs in subsection Vittadiniae in Bas' stirps Nauseosa—despite its lack of an odor. The placement is determined by the presence of basidial clamps, the distribution of universal veil material on the stipe, and the size and shape of the spores. The fact that the spores are thin-walled is also consistent with the proposed placement.
RET is in correspondence with several persons reporting similar taxa from the southeastern U.S. to northern South America.
—R. E. Tulloss
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Spore data for collections provisionally identified as: Amanita sp-M10 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.
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.