The cap of Amanita fibrillopes
is 32 - 34 mm wide, buff, darkening to light brown in age, convex, dry, with a nonstriate margin. The cap is
densely covered with light brown, often pointed warts. In the type,
the cuticle broke up into an areolate surface with a wart in the
center of each areola. The warts are said to be composed of a
pointed, darker upper portion that sits on a pale fibrillose base.
Further, the upper part of the wart is described as having a
Gills are adnate, close, thick, white, becoming
light brownish with age. The margin of the gills is densely coated at first with orange
floccules, possibly representing an incoherent ring. [Note: Miller's
illustration shows that in some fruiting bodies the partially opened
caps do have an incoherent ring that is breaking up into a form rather
like the spokes of a wheel. It is not possible from the original
description to tell if this ring-like tissue is distinct from the
universal veil material on the stem or part of it.] The short gills are infrequent or absent.
Its stem is 22 - 32 × 5 - 10 mm, dry, with rows
of tufted, grayish brown fibrils, densely formed over the entire
surface. The basal bulb is marginate to nonmarginate, upper
surface with orange-pink tint in some young material. [Ed. note:
Probably the original color of the volva before exposure.] [Note: Miller's
photographs show several bulbs with what appear to be distinctly
limbate volval remnants.]
The spores measure 9 - 12 (-13) × 6 - 7 (-8.4) µm and are ellipsoid to
elongate, infrequently cylindric and inamyloid. Clamps are absent at bases of basidia.
The contents of spores appear yellow in Melzer's solution.
Originally described from the state of Western
Australian growing in the sandy soil of a forest road. Known only from
the type locality. No associated plants are recorded.
Miller emphasizes that the basidiospores are
short and compact. This may have something to do with their growing in a roadway.
Photographs of the original material suggest it is
all rather young; and connection of gills to stem may not be adnate in
more mature material.
It would be interesting to know the colors of
the limbus internus of the volva that can be observed if a
"button" of this species is sectioned. Given the color of
the gill edges and the color reported on the young bulb, one might
guess that the limbus internus, at least, if not the entire volva, is
originally orange or orangish but quickly darkens on exposure. If this
guess were confirmed the species might be related to the bright
colored taxa with powdery or absent rings and which lack clamps. On
the other hand, the reference to a cuticle on the cap's volval warts and the apparent presence of a limbate volva at the base of the
stem suggests a relationship with the odd species of section Amanita
that can be found in Australia, Chile, and Andean Argentina
which sometimes are found with coherent volva limbs suggesting a
species of section Vaginatae.—R. E. Tulloss
O. K. Mill. 1992a ["1991"]. Canad. J. Bot. 69: 2700, figs. 37-40, 51.
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The following text may make multiple use of each data 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).
Paragraphs of black text will be labeled if further subdivision of
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 drawn from the protolog of the present species.
from protolog: Basidiome small, with broad stature. [Note: The reader should be aware that the photograph of this species published in the protolog suggests that the following description is based on a deformed and depauperate specimen. Hence, many characters recorded in the protolog may not describe a well-developed, healthy specimen.—ed.]
from protolog: 32 - 34 mm wide, buff, darkening in age to light brown, convex, dry, areolate; context not described; margin nonstriate; universal veil as densely placed warts, light brown or gray-brown or broan, "nearly" or "often" pointed, with each wart centered in areola.
from protolog: adnate, close, white, becoming light brownish with age, "thick"; lamellulae infrequent or absent.
from protolog: 22 - 32 mm × 5 - 10 mm, with upper surface in young specimens tinted orange-pink (6A2), dry, with rows of tufted, grayish-brown fibrils densely formed over the entire surface; bulb marginate to non-marginate; context not described; partial veil adhering to edges of lamellae, falling away at maturity leaving many orange (5A2) pieces clinging to edges of lamellae but forming neither [a membranous, skirt-like "annulus"] nor [leaving appendiculate remains on pileus margin]; universal veil on "upper bulb surface of two specimens." [Note: In the description of the partial veil, the editor has changed the word "surface" with relation to lamellae to "edge." The photograph in the protolog was used to interpret other parts of the description of the partial veil.—ed.]
from protolog: as mixocutis, up to 240 - 350 µm thick, not gelatinized, yellowish in KOH to light reddish-brown in Melzer’s Reagent; filamentous hyphae 3 - 9 µm wide, often branched, thin-walled.
from protolog: hyaline in KOH and light yellowish orange in Melzer’s Reagent; filamentous hyphae 4 - 11 (-20) µm wide, interwoven, thin-walled; acrophysalides up to 20 µm wide.
from protolog: [bilateral, ]divergent, yellowish in KOH, light ochraceous in Melzer’s Reagent; filamentous hyphae 3 - 13 µm wide, with scattered inflated cells up to 36 µm wide, thin-walled.
from protolog: irregular, often angular, thin-walled, hyaline cells, 6 - 20 × 5 - 12 µm.
from protolog: On pileus: filamentous hyphae 3 - 12 µm wide, abundant, interwoven, hyaline in KOH and Melzer’s Reagent; inflated cells "ovoid to vesiculose," (15-) 30 - 55 × (18-) 22 - 35 µm, intercalary or terminal (singly or sometimes in chains). On stipe not described.
lamella edge tissue
from protolog: inflated cells pyriform to subglobose to globose, 12 - 25 × 10 - 20 µm, thin-walled, hyaline, terminal singly or (often) in chains, "voluminous."
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.