of A. praeclara is 50 - 160 mm wide,
thick-fleshed, globose to plano-convex, sometimes
slightly depressed at the center, white, staining pale
yellow, appendiculate, with a nonsulcate margin. The cap
is minutely felted-fibrillose to fibrillose-squamulose,
with white, lanose-floccose covering when young, with age
glabrescent or with some poorly delimited, felted to
subverrucose patches over the center.
The gills are crowded to
subdistant, adnexed to free, thin, rather broad, straight
or ventricose, white to cream, and staining pale yellow.
The stem is 70 - 130 × 1 - 20 mm, equal, solid, firm, white, and glabrous.
The spores measure 8 - 9.5 (-10) × 8 - 9 (-10) µm and are amyloid and globose.
Clamps are not found at bases of basidia.
Amanita praeclara was originally described in the genus Lepiota
from Cape Province, South Africa where it occurs in fields and lawns—apparently without a woody plant
Bas placed A. praeclara in his stirps Thiersii. See A. thiersii Bas for discussion of the species now included in this stirps.—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.
Reid and Eicker. 1991. Mycol. Res. 95: 90, figs. 28-30.
The following text may make multiple use of each
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
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 predominantly taken
from the revision of the species by Bas (1969).
Basidiome: medium-sized to very large.
[Note: Reid and Eicker data
should be added.]
50 - 160 mm wide, white, staining pale yellow,
globose to plano-convex, sometimes
with slight central depression; context thick,
white with yellow spots;
margin nonstriate, appendiculate; universal
veil white, staining pale yellow, as minutely
fibrillose-squamulose to lanose-floccose covering when
young, with age detersile or as poorly delimited
felted to subverrucose patches over disc.
adnexed to free, crowded to subdistant, white to
cream, staining pale yellow, thin, 10 - 20 mm broad,
straight to ventricose, with entire edge;
lamellulae not recorded.
Bas (1969): 70 -
130 × 10(?) - 20 mm [note: length includes
that of bulb—ed.], cylindric, below partial veil
lanose-fibrillose at first, then glabrous;
bulb subclavate to rounded, up to 40 mm wide;
context solid(?) to stuffed to hollow(?), else
as in pileus; partial veil apical, pendent,
broad, membranous, with ragged free edge, white;
universal veil lanose-fibrillose, detersile.
Odor indistinct. Taste nutty,
Bas (1969): not
gelatinized; "very difficult to locate, merely a
layer of repent, interwoven to subradial hyphae 4 - 14
μm wide between trama of cap and volva."
bilateral; "probably without terminal inflated
40 - 50 × 12 - 14 μm, 4-sterigmate;
clamps not observed.
RET: 36 - 43 × 8.1 - 11.0 μm, dominantly 4-,
occasionally 2-sterigmate, with sterigmata up to 9.5
× 2.5 μm; clamps not observed.
On pileus: filamentous hyphae scattered, up to
12 μm wide; inflated cells subcylindric to
elongate-fusiform to slenderly clavate, 80 - 180 ×
10 - 30 μm, in abundant terminal chains.
On stipe: not recorded.
RET: On pileus: no yellow-walled elements
observed; filamentous undifferentiated hyphae
1.6 - 8.5 μm wide, branching, anastomosing;
inflated cells up to 187 × 29 μm in
terminal chains, with chains occasionally ending in
a group of cells arising in cluster from subterminal
cell; vascular hyphae not oberved; clamps rare or
absent, none seen on septa of uninflated
hyphae. On stipe: not recorded.
longitudinally acrophysalidic; filamentous hyphae
rather abundant, 3 - 10 μm wide; acrophysalides
abundant, clavate, 100 - 300 × 25 - 55 μm;
[20/1/1] 8.0 - 9.5 (-10.0) ×
8.0 - 9.0 (-10.0) μm, (Q = 1.0 - 1.05),
hyaline, colorless, with slightly thickened wall,
globose; apiculus rather strongly projecting;
content guttulate or translucent; white in
RET: [20/1/1] 7.9 - 9.4 (-11.6) × (7.3-) 7.5 -
88 (-11.0)μm, (L = 8.7 μm; L' =
8.7 μm; W = 8.3 μm; W' =
8.3 μm; Q = (1.0-) 1.01 - 1.08 (-1.09); Q
= 1.05; Q' = 1.05), ??, smooth, amyloid,
globose to subglobose, often adaxially flattened;
apiculus sublateral, truncate-pyramidal to
cylindric; contents dominantly
monoguttulate; color in deposit not recorded.
In fields and on lawns, growing in rings.
RET: In grass.
SOUTH AFRICA: WESTERN CAPE
Town Metropolitan Municipality - Simonstown, 22.iv.1948 A. A.
Pearson 10 (lectotype, K). EASTERN
CAPE PROV—Sarah Baartman Distr. -
Blue Crane Route Municipality, Somerset East,
1878 MacOwen 1011 (K).
"Amanita praeclara is a
medium-sized to very large, thickset, white,
flavescent species from South Africa. It
the species of stirps Nauseosa because of the
concentration of the (rather slight!)
lanose-fibrillose volval remnants on the stem just
below the ring. But clamps are absent, so that
it is placed here in the same stirps as A.
thiersii and A. aureofloccosa in which
clamps are also lacking and which have the same
small, globose spores, but in which the remnants of
the volva are scattered
over the whole lower part of the stem.
"This decision is also justified by the fact that
the next species, A. foetens, is somewhat
intermediate between A. praeclara on the one
side and A. thiersii and A.
aureofloccosa on the other. Amanita
foetens has more or less the same habit as A.
praeclara, but the remnants of its volva are
scattered over the whole lower part of the stem, as
in A. thiersii and A.
"Amanita praeclara has been found growing in
rings on football fields and is therefore almost
—R. E. Tulloss
Information to support the viewer in reading the content of "technical" tabs
can be found here.
"Playing Field Lepidella"
1. Amanita praeclara, South Africa.
Dr. Cornelis Bas - (1969) (1) South Africa,
(reproduced by courtesy of Persoonia, Leiden, the Netherlands).
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.