The following description is based on Beeli (1935).
The cap of Amanita luteoflava is 30 - 40 mm wide, expanded-convex, glabrous, orangish-yellow, with the center's color more saturated, with a depressed center and a striate margin. The flesh is thin, white, and firm. The volva is absent.
The gills are free, white, pointed at both ends, and about 3 mm broad.
Its stem is 70 - 80 × 3 - 5 mm, cylindric, usually narrow, hollow, fibrillose, white. The ring is membranous, thin, fragile, superior, skirt-like, and white. The volva is membranous, ample, whitish. The volva is saccate (Gilbert 1941). The flesh is white and firm.
The taste is bitter.
The spores measure 7 - 8 µm in diameter and are globose. Gilbert's (1940) spore drawings measure 10.6 - 13.6 × 9.7 - 12.9 µm and are globose to subglobose and inamyloid.
The present species was originally described from the Democratic Republic of Congo where it occurs singly in dry forest.
A watercolor by Madame Goossens exists, but neither Beeli nor Gilbert reproduced it.
It seems plausible that this species could be placed in stirps Hemibapha but knowledge of it is insufficient to be certain at the present time. To my knowledge no one has treated this species since Gilbert and all knowledge is based on the single specimen of the type collection.—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.
luteus, "yellow" + flavus, "yellow" [purer and paler yellow than luteus]
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, (Beeli 1935), and (Gilbert 1940 & 1941).
protolog: 30 - 40 mm wide, orange over disc, yellow toward margin, plano-convex, with disc becoming depressed, glabrous; context white, thin; margin striate [ca. 0.5R (per figure)]; universal veil absent.
Beeli (1935): generally as above, but with colors described as follows: orangish yellow, with tone more intense over disc.
from protolog: free, density not described, white, 3 mm broad; lamellulae not described.
protolog: 70 - 80 × 3 - 5 mm, smooth, fibrous, white, cylindric or narrowing upward (per figure); context hollow, firm, white; partial veil superior and pendent (per figure), very thinly membranous, white, ephemeral, striate above (per figure); universal veil saccate and fleshy (per figure), membranous, white, attached at or near very base of stipe (per figure).
Beeli (1935): as above and explicitly including some data previously derived from figure.
from protolog: 7 × 7 μm, hyaline, smooth, globose. [Note: Data is very different from that of Gilbert (below); past experience indicates Gilbert's spore drawings are much more likely to be reliable in reporting spore size and shape than are Beeli's protolog data. Sporograph cannot be generated.—ed.]
Beeli (1935): as above and content guttulate; white in deposit. [Note: Sporograph cannot be generated.—ed.]
Gilbert (1940): [2/1/1] 10.2 - 13.6 × 9.4 - 13.0 μm, (Q = 1.05 - 1.09), hyaline, smooth, regular, inamyloid, subglobose, at least somewhat adaxially flattened (per figure); apiculus sublateral (per figure); contents guttulate; white in deposit. [Note: In Gilbert's Tab. V (fig. 5), there are only two spores drawn in approximately lateral view for the present species. Hence, the widths might be a bit high (not much); and the values for Q, a bit low. On the other hand, we judge this is the most reliable data available.—ed.]
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.