The cap of A. campinaranae is about 60 mm wide, white to pallid
grayish, thin, convex, later nearly plane with a depressed center,
with no apparent innate fibrils, solid, viscid when moist, with a
nonstriate and nonappendiculate margin. The volva is present as subfelted,
crust-like remnants over the center and more isolated patches away
from the center. The flesh is white and unbruising.
The gills are free,
between close and crowded, forked towards both the stem and margin, narrow, white, and turning cream to yellow
when freshly dried, with a more or less concolorous edge. The short gills are attenuate.
The stem is 77 × 9 mm, slightly tapering upward, pale gray, and glabrous.
The bulb 20 mm wide, globose, subabrupt, dirty ochre or white. The
volva is grayish, powdery to slightly warty and forms a ring in the zone where
the bulb and stem meet. The ring is apical, membranous,
skirt-like, quite thin, white and smooth above, very pale gray
underneath. The flesh is white and unbruising.
The spores measure 5.6 - 6.7 × 5.5 - 6.5 µm and are strongly amyloid and globose to
subglobose. Clamps are absent at bases of basidia.
This species occurs in Campinarana
type vegetation under leguminous trees and trees of the family Sapotaceae
in the Brazilian state of Amazonas. It is believed to be symbiotic
with at least some of the associated trees. Information about the
vegetation type can be found on the Smithsonian Institute Department
of Botany website. Bas says (1978):
"Within section Validae it is well characterized by its
small, (sub)globose spores, it's thin white to greyish pallid cap with
grey, crust- to patch-like volval remnants and it's globose bulb
decorated with a greyish volval rim giving the bulb a submarginate
appearance." In a recent discussion of small spore size in
Amanitas of tropical forests, the present species was used as an
example of this characteristic; and, of the small spored species in the
Americas, it's spores are smallest (Tulloss 2005).
—R. E. Tulloss and L. Possiel
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INPA; isotype, L
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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
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Olive text indicates a specimen that has not been
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The following material is derived from the protolog.
from protolog: [10/1/1] 5.6 - 6.7 × 5.5 - 6.5 μm,
(Q = 1.0 - 1.15 Q = 1.05; Q' = 1.05),
"very pale brownish-yellowish when resoaked in NH4OH," smooth, with wall very slightly thickened, strongly amyloid, globose to subglobose, often tapering toward apiculus;
apiculus [truncate-conic in illustration—ed.]; contents usually monoguttulate, with "oil drops" particularly brownish-yellowish in NH4OH; color in deposit not recorded. [Note: In the protolog, Bas makes this observation: "In view of the slightly thick-walled and in NH4OH somewhat yellowish-brownish spores, it is possible that the spore print of this species is slightly coloured."—ed.]
"Terrestrial in Campinarana vegetation under Leguminosae and Sapotaceae...; forming ectotrophic mycorrhiza."
from protolog: BRAZIL: AMAZONAS—on rd. from Manaus to Caracarai, km 45 [2.688° S/ 60.049° W], 3.ii.1978 R. Singer B10602 (holotype, INPA; isotype, L).
—R. E. Tulloss
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