| name |
Amanita sp-AZ25 |
| name status |
cryptonomen temporarium |
| GenBank nos. |
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|
| pileus |
98 mm wide, white, developing ochraceous spots,
broadly convex with slightly incurved margin, dry,
matte; context off-white, becoming sordid pink
less than 1 min. after being cut, 10 mm thick at
stipe, thinning evenly to margin; margin
nonstriate at first, appendiculate (with fine
flocculence); universal veil as membranous
patch (roughly central, originally white, becoming
sordid tan, cracking here and there, otherwise
smooth) and scattered fibrils (originally white,
becoming brick-colored, representing inner layer of
universal veil). |
| lamellae |
free, close (in exsiccatum), cream in mass, pale cream
in side view, pale pink in
1? min
after bruising, 8.5 mm broad, with edge bearing pale
cream to white flocculence; lamellulae truncate
to subtruncate, ??. |
| stipe |
69 × 19 mm, white, with white surface
pulverulence/flocculence staining pinkish brown,
narrowing upward, not flaring at apex; context
off-white, becoming pink in 1? min after bruising,
stuffed with white fibrillose material (with densely
packed fibrils having apparent longitudinal arrangment
and becoming pinkish tan when crushed), with larva
tunnels concolorous; partial veil as thin and floccose
line, white, submedian, lasting 24+ hr;
universal veil
as thick saccate volva, membranous, tough, leathery,
breaking up into several roughly triangular limbs,
with exterior surface whitish and taking on reddish
brown tints, with interior pale grayish buff with
concolorous larva tunnels, 60 × 48 mm, with limbs
2.5 - 4 mm thick at mid-height, with limbus
internus small, sometimes shelf-like, set low on
interior of limb (at point of attachment to stipe in
“button” stage. |
| odor/taste |
Odor fresh and pleasant. Taste
mild and pleasant. |
macrochemical
tests |
Syringaldazine spot test for laccase - positive only
on surface of stipe [within 2 - 3 min, then fading or
being overcome by orange oxidation reaction promoted
by solvent (ethanol)], negative throughout remainder
of basidiocarp. Paracresol spot test for
tyrosinase - positive throughout basidiocarp
(for most parts within 2 - 3 min). |
| basidiospores |
[20/1/1] (10.5-) 10.8 - 14.0 (-14.5) × (5.0-) 5.2 -
6.2 (-6.5) µm, (L = 12.0 µm;
L’ = 12.0 µm; W = 5.7 µm;
W’ = 5.7 µm; Q = (1.81-) 1.83 - 2.42 (-2.55);
Q = 2.10; Q’ = 2.10), hyaline, colorless,
thin-walled, smooth, amyloid, elongate to cylindric,
adaxially flattened, sometimes slightly constricted,
occasionally expanded at one end; apiculus
sublateral, truncate-conic, small; contents
granular to monoguttulate; color in deposit not
recorded, probably white. |
| ecology |
Arizona: Solitary. In loam/duff under conifers. |
| material examined |
U.S.A.:
ARIZONA—Cochise Co. - “downhill” from
CMP site #46, 21.viii.1992 Richard L. Homola s.n.
[Tulloss 8-21-92-F; CMP1304] (RET). |
| discussion |
The range of this species appears to overlap with that
of another taxon of section
Amidella—A.
fallax.
A sporograph comparison of the two species is
provided here:
The spore size and shape of the two taxa are similar.
However, the sample size for the spore data is small. |
| citations |
Macroscopically, this entity is similar morphologically
to A. volvata sensu Herrera & Pérez-Silva
(1984), which was described
from Mexico (states of Hidalgo, Mexico, and
Morelos).—R. E. Tulloss |
| editors |
RET |
|
