name | Amanita roseolescens |
name status | nomen acceptum |
author | (Pearson) Bas |
english name | "Rose Staining Lepidella" |
images | |
cap |
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. |
gills |
The gills are crowded, free, broad, at first white, and later pink to pinkish buff. The short gills are attenuate. |
stem |
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. |
spores | 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 basidia. |
discussion |
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
without the
presence of any woody plant symbiont. The most similar taxa are A. foetidissima D. A. Reid & Eicker nom. inval., A. manicata (Berk. & Broome) Pegler, and A. nauseosa (Wakef.) D. A. Reid in Bas' stirps Nauseosa.—R. E. Tulloss |
brief editors | RET |
name | Amanita roseolescens | ||||||||
author | (Pearson & Stephens) Bas. 1969. Persoonia 5: 5: 374, figs. 71-73 | ||||||||
name status | nomen acceptum | ||||||||
english name | "Rose Staining Lepidella" | ||||||||
synonyms |
≡Lepiota roseolescens Pearson & Stephens in Pearson. 1950. Trans. Brit. Mycol. Soc. 33: 288. 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. | ||||||||
MycoBank nos. | 308586 | ||||||||
GenBank nos. |
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.
| ||||||||
holotypes | K | ||||||||
revisions | Reid and Eicker. 1991. Mycol. Res. 95: 91, figs. 31-34. | ||||||||
intro |
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 material. 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 1969). Basidiomes large to very large. | ||||||||
pileus | Bas (1969): 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). | ||||||||
lamellae | Bas (1969): Free, crowded, at first white, later pink to pinkish buff, 16 - 13 mm broad, with serrate edge; lamellulae attenuate. | ||||||||
stipe | Bas (1969): 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 base. | ||||||||
odor/taste | Bas (1969): Odor sweetish, soap-like when young, becoming very unpleasant with age ("boiling glue"). Taste mild. | ||||||||
macrochemical tests |
none recorded. | ||||||||
pileipellis | Bas (1969): as somewhat denser layer between pileus context and universal veil, not generalized. | ||||||||
pileus context | not described. | ||||||||
lamella trama | not described. | ||||||||
subhymenium | not described. | ||||||||
basidia | Bas (1969): 4-(some 2- or 3-?) sterigmate; clamps present. | ||||||||
universal veil | Bas (1969): 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 present. | ||||||||
stipe context | Bas (1969): longitudinally acrophysalidic; filamentous hyphae "broad"; clamps present. | ||||||||
partial veil | not described. | ||||||||
lamella edge tissue | not described, but in all probability sterile. | ||||||||
basidiospores | Bas (1969): [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. | ||||||||
ecology | Bas (1969): South Africa: Terrestrial in fields, often growing in rings. | ||||||||
material examined |
Bas (1969): SOUTH AFRICA: CAPE PROVINCE—Valkenburg, | ||||||||
discussion |
Bas (1969)
"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. praegraveolens 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 other. "As the type specimens came from a large ring on a football field, A. roseolescens is almost certainly non-mycorrhizal." | ||||||||
citations | —R. E. Tulloss | ||||||||
editors | RET | ||||||||
Information to support the viewer in reading the content of "technical" tabs can be found here.
name | Amanita roseolescens |
name status | nomen acceptum |
author | (Pearson) Bas |
english name | "Rose Staining Lepidella" |
images | |
drawing | Dr. C. Bas (1969) - (1) South Africa, reproduced by courtesy of Persoonia, Leiden, the Netherlands. |
name | Amanita roseolescens |
bottom links |
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name | Amanita roseolescens |
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[ Keys & Checklists ] |
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.