The cap of A. roseolescens is 100 - 160 mm wide,
semiglobate to convex, thick fleshed, white to pale
ochraceous, with a slight pink tinge, dry,
fibrillose-subsquamulose with squamulose center with age,
appendiculate, with a nonsulcate margin. The flesh is
white turning pinkish buff.
The gills are crowded, free, broad, at first white, and later pink to pinkish
buff. The short gills are attenuate.
The stem is 100 - 140 × 15
- 30 mm, equal or slightly enlarged below, solid, pinkish
white to pinkish buff, with thick, lanose-squmose
covering especially at the middle.
The spores measure 9 - 11 (-12) × 8 - 10 (-10.5) µm
and are amyloid and globose to
broadly ellipsoid. Clamps are present at bases of
Amanita roseolescens was originally described
from South Africa. It is still
known only from that country. It is one of
the taxa of section Lepidella that occur
presence of any woody plant symbiont.
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 unreleased (pending) pages.
These pages will eventually be made live, so try again later.
Reid and Eicker. 1991. Mycol. Res. 95: 91, figs. 31-34.
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 (Bas
Basidiomes large to very large.
100 - 160 mm wide, hemispheric to convex, dry;
context thick, white, turning very pale pinkish buff on exposure;
margin appendiculate; universal veil
entirely lanose-squarrose when young,
fibrillose-subsquamulose with squamulose area over
disc with age,
white to pale ochraceous, with slight pinkish tinge
(pinkish buff when freshly dried).
Free, crowded, at first white, later pink to pinkish
buff, 16 - 13 mm broad, with serrate edge;
100 - 140 × 15 - 30 mm, pinkish white to
pinkish buff, cylindric or narrowing upward;
bulb lacking; context solid (?),
with colors as in pileus; partial veil apical, pendent,
submembranous, easily torn, pinkish white;
universal veil as lanose-squamose covering
especially over mid stipe, nearly absent toward stipe
Odor sweetish, soap-like when young, becoming
very unpleasant with age ("boiling glue").
as somewhat denser layer
between pileus context and universal veil, not
4-(some 2- or 3-?) sterigmate;
On pileus: filamentous
hyphae rather scarce; inflated cells
subcylindric to slenderly fusiform, 40 - 130 ×
15 - 35 μm, in abundant terminal chains, with
chains having more or less anticlinal orientation in
upper part of warts; clamps present. On
stipe: including large elongate cells; clamps
filamentous hyphae "broad"; clamps present.
[20/1/1] 9.0 - 11.0 (-12.0) × 8.0 - 10.0 (-11.5) μm, (Q = 1.0 - 1.25; Q = 1.15), colorless, hyaline, with thin or barely thickened wall, amyloid, globose to subglobose to broadly ellipsoid; apiculus sublateral, abrupt, small to moderately large; contents subgranular to translucent; white to pinkish white in deposit.
South Africa: Terrestrial in fields, often growing in
Bas (1969): SOUTH AFRICA: CAPE PROVINCE—Valkenburg, v.1949 M. Cole-Rous & E. L. Stephens s.n. [Pearson 681] (holotype, K).
"Amanita roseolescens is
a species from South Africa with a large to very large,
thickset, pinkish white to pinkish buff fruit-body with
pink to pinkish buff gills and with a strongly
lanose-floccose cap and middle part of stem.
"This species has the largest spores of all the
species of the, undoubtedly closely related stirpes
Nauseosa and Thiersii.
Together with the small-spored A.
it also has the most ellipsoid spores in these two
stirpes. Apparently A. roseolescens
and A. praegraveolens are intermediate
between stirps Vittadinii on the one hand and
stirpes Nauseosa and Thiersii on the
"As the type specimens came from a large ring on a
football field, A. roseolescens is almost
—R. E. Tulloss
Information to support the viewer in reading the content of "technical" tabs
can be found here.
"Rose Staining Lepidella"
1. Amanita roseolescens, South Africa.
Dr. C. 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.