1. Amanita gioiosa, under eucalyptus, Cagliaria, Sardinia, Italy.
2. Amanita gioiosa, under eucalyptus, Cagliaria, Sardinia, Italy.
3. Amanita gioiosa, under eucalyptus, Cagliaria, Sardinia, Italy.
4. Amanita gioiosa, under chestnut, Grosseto, Italy.
The description is
predominantly based on the two papers of Curreli (1990,
The cap of A. gioiosa is (60-) 70 - 100 (-140) mm wide, cream at the edge and
progressively becoming brown from the center outwards or entirely brown
or, in several examples, ash-gray, darkest in the center, globose at first,
becoming hemispherical to convex, finally depressed in the center in mature
material, often marked with random and shallow indentations, and having a short-striate margin. The form
of the cap is often irregular. The cap skin is easily peeled. The
cap is covered with shallow, farinose warts, at first whitish,
cream-white, and easily removed in humid conditions. The flesh is white and firm.
The gills are free, whitish to white-cream at maturity, fairly thick,
with a serrate edge. Short gills are present.
The stem is (60-) 70 - 120 (-160) × 15 - 20
mm [length apparently includes length of bulb], expanded at the top, white, smooth, with a bulbous base. The bulb is radicating.
The stem has an elliptical cross-section. At maturity, the stipe's ring
can take the form of a
belt and is not very evident. In many examples, the ring is absent at
maturity (see below). The volva is
only present at the base of the stem as a narrow
limb at the top of the bulb. [Note: This information about the volva is
our interpretation based on dried specimens and illustrations of Curreli (1990,
2000) and Neville and Poumarat (2004).] The flesh is white,
compact, stuffed at maturity.
According to the original description, the spores
of A. gioiosa measure (8-) 9 - 11 (-12) × (6-)
7 - 7.7 (-8) µm and are broadly ellipsoid to ellipsoid and inamyloid.
Neville and Poumarat (2004) report that the spores measure 8 - 11.5 (-13) x
(5.5-) 6 - 8.5 (-9.5) µm and are broadly ellipsoid to ellipsoid
(occasionally elongate) and inamyloid. Spores measured by RET
(Sardinian material courtesy Dr. M. Contu) are as follows: (8.0-) 8.9 -
11.5 (-13.4) × (6.5-) 7.0-
9.0 (-9.5) µm and are broadly ellipsoid to ellipsoid and inamyloid.
Clamps are common at bases of basidia.
The present species occurs in large groups, sometimes in groups with
the bases growing together, or solitarily, in wooded areas with Eucalyptus
and an under story of Cistus on pebbly, sandy sand and
also in diverse, mixed forests with the presence of broad-leaved trees.
The species was originally described from Sardinia, Italy. Neville
and Poumarat state that it is more widespread around the Mediterranean and
indicate association with Arbutus, chestnut (Castanea), oak
(Quercus), and pine (Pinus).
This species could have been introduced with Eucalyptus
or could be a native Mediterranean species that is actually growing with Cistus,
rather than Eucalyptus. The belt-like ring is placed rather low on the stem,
but is apparently not the analogue of the rings on the base of the
stem in species belongs in the
group with Amanita muscaria (L. : Fr.) Lam..
One of the illustrations of the
present species included by Neville and Poumarat (2004) shows that the
ring originally connects the stipe to the cap margin and that, at that
time, it is membranous and of rather small radius. [
Return to description of stem. ]
The best available description is that of Neville and Poumarat (2004).—R. E. Tulloss and L. Possiel
Photos courtesy of Dr. S. Curreli (Sardinia, Italy)
S. Curreli ex S. Curreli. 1991a. Micol. Ital. 20(1): 51.
"Pebbly Soil Amanita"
≡Amanita gioiosa S. Curreli nom. inval.1990. Micol. Ital. 19(1): 25. [Location of deposit of holotype not given. ICBN §37.5]
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.
Due to delays in data processing at GenBank, some accession numbers may lead to dead pages.
These pages will eventually be made live, so try again later.
in herb. Gruppo Micologico Zonale San Gavino
Neville and Poumarat. 2002 ["2001"]. Bull. Trimestriel Soc. Mycol. France 117(4): 286.
Neville and Poumarat. 2004. Fungi Europaei 9: 292, fig. 47, phot. 16A-C, pl. 15-16.
S. Curreli. 2000. Boll. Gruppo Micol. G. Bresadola 43(2): 89.
Lavorato. 2000. ibid.: 122.
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 species and from original research of R. E. Tulloss.
RET: cellular; with 1-2 layers of inflated cells (subglobose to ellipsoid to broadly subfusiform) below bases of longest basidia.
RET: 40 - 55 × 9.5 - 12.0 μm, 4-sterigmate, thin-walled, with sterigmata up to ? μm; clamps rather common, easily visible without staining.
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.