Amanita sp-Arora-01-536

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name	Amanita sp-Arora-01-536
name status	cryptonomen temporarium
images	1. Amanita sp-Arora-01-536, ca. Mpika, Mutinondo Wilderness Area, Northern Prov., Zambia. 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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accession	locus	voucher	source

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.

basidiospores

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[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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