2. Amanita sp-Arora-01-536, exterior of bulb, note soil particle colors on bulb contrasting with dark subfelted limb of volva on bulb margin.
3. Amanita sp-Arora-01-536, longitudinal section of bulb and dark volva material on bulb margin.
4. Amanita sp-Arora-01-536, longitudinal section, of bulb and dark volva material on bulb margin outlined in white.
intro
This probable species is known from a single collection made in Zambia.
cap
The convex cap is orangish tan with a distinctly striate margin. Much of the surface may be covered by a subfelted layer of brownish gray volval material. The volval material may be darker at first (like that on the stem) and become paler with drying or the action of sunlight.
gills
The gills are pallid orangish in mass.
stem
The stem's basic color is a paler version of that of the cap. The stem is often coated with a dark brownish gray farinose coating. The stipe bears a bulb that seems turnip-shaped in the material we have seen; around its margin there are submembranous or felted limbs of brownish gray volval material..
odor/taste
Neither odor nor taste was recorded for this mushroom.
spores
The spores of this taxon measure (8.2-) 8.8 - 11.5 (-15.0) × (7.4-) 7.8 - 10.5 (-12.0) μm and subglobose to broadly ellipsoid and inamyloid. Clamps have not been found at the bases of basidia.
discussion
—R. E. Tulloss, C. Rodríguez Caycedo, and D. Arora
brief editors
RET
name
Amanita sp-Arora-01-536
name status
cryptonomen temporarium
GenBank nos.
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intro
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 derived from field notes and photographs of David Arora and original research of R. E. Tulloss.
pileipellis
not gelatinized and having extensive hyphal interconnection with universal veil in mature specimen examined.
basidia
clamps not found after extensive search.
universal veil
On pileus: remaining long connected by filamentous hyphae to pileipellis. On stipe base: filamentous hyphae branching, abundant; inflated cells, abundant, golden brown in dilute KOH solution.
[40/1/1] (8.2-) 8.8 - 11.5 (-15.0) × (7.4-) 7.8 - 10.5 (-12.0) μm, (L = 10.1 μm; W = 8.9 μm; Q = (1.04-) 1.06 - 1.23 (-1.26); Q = 1.14), hyaline, colorless, smooth, thin-walled, inamyloid, subglobose to broadly ellipsoid, infrequently globose, adaxially flattened; apiculus sublateral, cylindric, often proportionately large; contents monoguttulate; color in deposit not recorded.
ecology
not recorded.
material examined
RET: ZAMBIA:
NORTHERN PROV.—Mpika Distr. - ca. Mpika, Mutinondo, Wilderness Area, 22 km off Great North Hwy., 31.xii.2000-7.i.2001 David Arora 01-536 (RET 348-1; SFSU).
discussion
In comparison with published taxa, this originally struck RET as similar to A. fuliginosa primarily because of the form and color of the universal veil, and the striate pileus margin; however, the color of the surface of the cap is orangish rather than fuligineous; and, in comparison with Bas' description of the spores of the holotype (Bas 1969) of A. fuliginosa, the spores of the present taxon are distinctly larger as well as inamyloid.
The distinct bulb at the bottom of the stipe in the present species and the inamyloid spores require it to be placed in sect. Amanita.
citations
—R. E. Tulloss and C. Rodríguez Caycedo
editors
RET
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2. Amanita sp-Arora-01-536, exterior of bulb, note soil particle colors on bulb contrasting with dark subfelted limb of volva on bulb margin.
3. Amanita sp-Arora-01-536, longitudinal section of bulb and dark volva material on bulb margin.
4. Amanita sp-Arora-01-536, longitudinal section, of bulb and dark volva material on bulb margin outlined in white.
photo
David Arora - (1) ca. Mpika, Mutinondo Wilderness Area, Northern Province, Zambia.
RET - (2-4) bulb from same Mutinondo Wilderness Area collection with cross-sections illustrating position and form of subfelted volval limb on bulb margin.
name
Amanita sp-Arora-01-536
name
Amanita sp-Arora-01-536
Spore data for collections provisionally identified as: Amanita sp-Arora-01-536
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.
Spore data sets and their composite