J. Geml et al., Naturalis Biodiversity Centre, Leiden
The following text may make multiple use of each entry field.
The field may contain magenta text presenting data from a type study
and/or revision of other original material cited in the protolog of the present taxon.
Macroscopic descriptions in magenta are a combination of data from the protolog and
additional observations made on the exiccata during revision of the cited original
The same field may also contain black text, which is data from a revision of the present
taxon (including non-type material and/or material not cited in the protolog).
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this text is appropriate.
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 collectors'
notes and photographs and their contribution of
exsiccata; on the molecular research of D.
Haelewaters, S. D. Russell and J. Geml; and on other
original research of RET.
up to 80 mm wide, pale grayish
brown (6D5) at first and fading to brassier than
6C4, parabolic to convex, glabrous, even:
context white, unchanging when cut or
shallowly sulcate; universal veil as
flattened, off-white, felty warts.
free, crowded, white, with fimbriate margins;
80-90 × 10-15 mm (width measured at apex),
white, silky-fibrillos, bulb distinct at
first, less so in age; annulus white,
skirt-like, collapsing on stipe; universal
veil as "rolled sock" around top of bulb or
as short free limb at top of bulb.
308–350 µm thick in young specimen;
upper layer extensively gelatinized,
100–175 µm thick; lower layer
ungelatinized, 175–200 µm thick, with
strongest pigmentation (yellow-orange)
in 65 µm thick zone
immediately below gelatinized layer;
filamentous, undifferentiated hyphae
2.0–7.0 µm wide, branching, densely
interwoven, dominantly subradially
arranged; vascular hyphae 3.0–5.4 µm wide,
with knobby outline, infrequent; clamps
filamentous, undifferentiated hyphae 2.0–13.5 µm
wide, branching, dominating, interwoven, often
in fascicles, occasionally with narrowly fusiform
to narrowly clavate to cylindric slightly
inflated intercalary cells (up to 21 µm wide),
with walls up to 0.5 µm thick, sometimes with
yellowish walls; acrophysalides terminal, singly
or (occasionally) in short chains, ellipsoid to
ovoid to broadly clavate to clavate to narrowly
clavate to narrowly fusiform, up to 123 × 34 µm,
with walls up to 0.8 µm thick; vascular hyphae
not observed; clamps not observed.
bilateral divergent; with subhymenial base composed largely of
curving slightly inflated elongate to allantoid to
clavate to subglobose cells (up to 112 × 20 µm) and
branching, filamentous, undifferentiated hyphae, with
angle of divergence shallow (not exceeding 30°);
wcs = 30–50 µm; filamentous,
undifferentiated hyphae 1.2–5.5 µm wide, branching,
with ventricose intercalary elements up to 18.0 µm
wide within central stratum and in subhymenial base;
terminal, inflated cells apparently absent; vascular
hyphae not observed.
wst-near = (10–) 20–45 µm
and wst-far = 30–70 µm
(moderately inflated) to
wst-near = 50–70 µm and
wst-far = 70–100 µm
(well inflated); with plentiful inflated
elements, but also with uninflated hyphal
segments, with basidia arising from small
inflated cells and from short chains of
short uninflated hyphal segments or
(infrequently) from allantoid cell
originating near edge of central stratum.
32–62 × 9.5–12.8 µm, dominantly 4- and
occasionally 2-sterigmate, with sterigmata
up to 8.0 × 1.8 µm; clamps not observed.
On pileus: gelatinizing at upper surface
and there all elements collapsed, with
uncollapsed portions pale brown in mass;
filamentous, undifferentiated hyphae 3.5–6.5 µm
wide, branching, sometimes in fascicles, common;
inflated cells dominating, hyaline at first,
becoming pale gray by time of pileus separation
from partial veil, pale gray to pale brown by
onset of sporulation, tending toward periclinal
orientation, often smaller near pileipellis,
terminal, singly or in chains of 2 or 3, with
some such chains having anticlinal orientation,
cylindric to fusiform to narrowly fusiform to
narrowly clavate (up to 108 × 36 µm), globose to
subglobose to broadly ellipsoid to ellipsoid (up
to 80 × 53 µm), with walls thin or (more
frequently) up to 1.0 µm thick; vascular hyphae
2.4–8.0 µm wide, knobby, branching, locally in
complex tangles, plentiful to locally infrequent
(absent from all sections in one basidiocarp of
Tulloss 3-2-89-E). On stipe base:
similar to that on pileus, but with larger and
more plentiful fascicles of filamentous,
undifferentiated hyphae, with hyphae and
inflated cells in approximately equal
quantities, with chains of inflated cells often
aligned with fascicles of hyphae
(sublongitudinally?), with inflated cells
somewhat more brown than on pileus; vascular
hyphae 3.5–5.6 µm wide, scarce; clamps not
longitudinally acrophysalidic; filamentous,
undifferentiated hyphae 2.0–10.5 µm wide,
branching, plentiful, with walls from slightly
thickened up to 0.7 µm thick; acrophysalides
plentiful to dominating away from surface, often
rounded at septum, sometimes nearly cylindric,
up to 280 × 42 µm, with walls up to 1.0 µm
thick; vascular hyphae 5.6–11.9 µm wide,
uncommon; clamps not observed.
filamentous, undifferentiated hyphae 2.1–9.8 µm
wide, frequently branching, dominating, often in
fascicles, dominantly subradially arranged, with
walls thin to slightly thickened and occasionally
yellowish; inflated cells narrowly clavate,
plentiful, terminal, singly, up to 206 × 21 µm,
with walls up to 0.5 µm thick; vascular hyphae
2.4–21 µm wide, with knobby outline, sinuous,
scattered to moderately common; clamps not
Mexico, Tlaxcala: In forest of Abies,
Pinus, and Quercus.
U.S.A., New Mexico: At 2690 m elev. In mixed forest
of Populus tremuloides, Picea,
Abies, Pseudotsuga menziesii,
Alnus, and Pinus ponderosa.
TLAXCALA—Mpio. Tlaxco - Sierra Tlaxco,
carrera Apizaco-Poza Ricard, km 31, Rancho Escondido,
15.vii.1996 A. Kong-Luz, A. Estrada Torres, R. H.
Petersen, et al. s.n. [RET 7-15-96-D] (RET 253-8,
nrITS seq'd.; TLXM ??).
ARIZONA—Cochise Co. - CMP site #46,
18.viii.1991 R. E. Tulloss 8-18-91-W [CMP0861]
(RET 701-3, nrITS-LSU seq'd.).
NEW MEXICO—Taos Co. - 2.4 km N of Red
River on Mallette Rd., 5.ix.1993 R. E. Halling 7115
(NY; RET 115-8, nrLSU seq'd.).
The present species is based on genetic evidence
that supports its being viewed as a distinct sister
species to Amanita
This species now contains the collection formerly
assigned to "Amanita sp-NM06" on this site. Also,
the present page contain one of the specimens formerly
called "A. sp-AZ07" on this site.
—R. E. Tulloss
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Tulloss, Haelew., Geml, S. D. Russell and A. Kong
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