The following description is based on Beeli (1935).
The prominently umbonate cap of
Amanita strobilaceovolvata is 60 - 120 mm wide,
fleshy, conic-convex, glabrous, dark brown in the
center and for the inner half of the cap's radius and
otherwise yellow; it is dry, with a striate
margin. The cap skin can be pealed off the
underlying flesh. The cap flesh is firm and
white—except for being yellowish below the cap skin.
The gills are free, somewhat pointed at both ends, crowded, yellowish-white, 4 mm broad, thin, and fragile. There are two short gills for every seven gills extending from margin to stem.
The hollow stem of this mushroom is 120 - 220 × 7 - 10
mm, cylindric, fibrillose, smooth or sub-smooth,
easily separated from the cap, and yellowish
white. The ring is membranous, white, superior,
skirt-like, and fragile. The flesh is firm and
white. The volva is saccate, pinkish white; the
exterior surface is divided into lumpy or bulging
regions so that it looks like a net bag full of
fruit. The volva sac is connected only at the
stem's very base as depicted in Madame Goossens'
watercolor. The fleshy interior of the volva is
This mushroom is odorless, and the taste is slightly acrid.
Based on the spore drawings of Gilbert (1941), the
spores are 9.3 - 11.3 × 8.1 - 9.5 (-9.9) µm,
subglobose to broadly ellipsoid and inamyloid.
The present species was originally described from
the Democratic Republic of Congo where it is said
to occur singly in dry forest.
Gilbert (1941) makes the case that
fibrillosa Beeli was based upon an old
specimen of Amanita strobilaceovolvata.
However, Gilbert did not take into account several
observations that do not support his proposal.
These are discussed on the taxon page for
Zhu L. Yang has described species of sect.
Vaginatae with decorated volva from Yunnan
Province, China. One such example is
Zhu L. Yang (1997).
But in this species, while the exterior of the
volval sac is divided into many regions, the
regions do not bulge outward and are each decorated
by a single, central wart.
The reader may wish to refer to other species
of section Vaginatae
with an annulate stipe. Among these are Amanita
madagascariensis (warted universal veil)
sp-Arora_01-555 (smooth universal
veil). Sporograph comparisons
are available on the technical tab of this
Because this species is an annulate
species of section Vaginatae, as are the
other speices assigned to to the present stirps, it
is assigned here despite lack of molecular
Amanita strobilaceovolvata sensu Pegler and
Shah-Sm. was demonstrated to be based on a mixture
of distinct taxa by Tang et al.
(2015).—R. E. Tulloss
The editors of this site owe a great debt to Dr. Cornelis Bas
whose famous cigar box files of Amanita nomenclatural information
gathered over three or more decades were made available to RET for computerization
and make up the lion's share of the nomenclatural information presented on this site.
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 derived from the protolog of the present taxon and from (Gilbert 1940 & 1941).
from protolog: 60 - 120 mm wide, fuligineous on yellow ground (i.e. (per figure), fuligineous over disc and outward about one-half of radius and yellow for remainder of radius), conic-convex, umbonate, glabrous, dry; context fleshy, firm, white, [?except—ed.] yellowish under pileipellis; margin striate (ca. 0.6R per figure); universal veil absent; pileipellis separable.
from protolog: free, crowded, white with yellowish tint, 4 mm broad, subacute at both ends, thin, fragile and breaking, 7 per cm (?at pileus circumference); lamellulae 2 per cm (?at pileus circumference).
from protolog: 120 - 220 × 7 - 10 mm, yellowish white, cylindric, smooth or subsmooth, easily separable from pileus, totally elongating per figure; context hollow, firm, white; partial veil superior, membranous, white, pendent, fragile; universal veil as saccate volva, with exterior divided into bulging regions [like net bag of fruit per figure—ed.], membranous, thick, with pallid to reddish brown tinted exterior and orangish-brownish in interior.
from protolog: Odor lacking. Taste very slightly acrid.
from protolog: at surface filamentous hyphae 2 μm wide, subhyaline, interwoven "parallelly."
from protolog: at surface filamentous hyphae 4 - 5 μm wide, parallel.
from protolog: 6 μm wide, hyaline, smooth, inamyloid, "globose"; apiculus present (per figure); contents not described; white in deposit.
Gilbert (1940): [2/1/1] 10.6 - 10.7 × 9.0 - 10.2 μm, (Q = 1.06 - 1.18), hyaline, smooth, inamyloid, subglobose to broadly ellipsoid, at least sometimes adaxially flattened (per figure), inamyloid; apiculus sublateral and cylindric to truncate-conic (all per figure); contents not described; white in deposit. [Note: Spore measurements are taken from two drawings of (Gilbert 1940: tab. VI (fig. 1)) that are most likely to be presented in lateral view.—ed.]
from protolog: Solitary. Terrestrial in dry forest.
from protolog: CONGO, DEMOCRATIC REPUBLIC OF: PROV. EQUATEUR—Territoire Lisala - Binga [2°23'41" N/ 20°25'25" E, 361 m], vi.1931 M. Goossens-Fontana 928 (holotype, BR, watercolor).
For a discussion of why Gilbert's proposal
treat A. fibrillosa as a taxnomic synonym of
the present species appears not to be well-supported,
see the discussion on the technical tab of
Amanita strobilaceovolvata sensu Pegler and
Shah-Sm. was demonstrated to be based on a misture
of distinct taxa by Tang et al.
However, Tang et al. fail to demonstrate that the
specimen they examined morphologically satisfies
the original description of the present species or
the partial type review of Gilbert
(1940-1941). For example, the cap color is
not a match for that of
the present species as they claim; and
Gilbert's spore data (which RET has often found to
be reliable so far as it goes) falls entirely
outside of the
size-shape ranges reported by Tang et al.
The sequence they propose for the species comes
from a specimen that is not mentioned at all in
terms of morphological revision. It seems
they have not resolved the concept of A.
The following figures compare the known spore data
of the present species with sporographs of other
taxa of section Vaginatae that have an
madagascariensis (warted volval surface)
sp-Arora_01-555 (smooth volval
—R. E. Tulloss
Information to support the viewer in reading the content of "technical" tabs
can be found here.
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.