The following description is based on the original description by Bas (1969).
The cap of Amanita rhoadsii var. flavotingens is 65 mm wide, plano-convex, white, turning yellow when bruised, dry, with a nonstriate margin. The cap is completely covered with a powdery to somewhat finely fibrillose volval layer, sometimes with fluffy, floccose, small warts near the center. The flesh is white and turns yellow when cut.
The gills are crowded, touch the stem, rather narrow, white, yellow when bruised. The short gills are attenuate.
The stem is 80 × 10 mm, solid, white, yellow where bruised, covered with floccose material, lacking a ring, cylindric. The bulb is elongate-radish-like and 40 × 25 mm. The volva is present as some vague, friable fragments on the top of the bulb. The flesh is white, turning yellow when cut, at length turning reddish brown.
The taste is mild. The odor is slightly pungent but not of decaying protein ("chloride of lime").
The spores measure 10 - 12 × 3.5 - 4.5 µm and are cylindric to bacilliform, slightly yellowish, and amyloid. Clamps are present at bases of basidia.
This species was originally collected from Florida (USA). The tree association is unknown.
Among the differences from the type variety are the yellowing reaction, the strong gelatinization of the cap surface including cap flesh below the volval remnants, the alteration of the odor, the spores are shorter, and the length to breadth ratio is not reported to exceed 3.2. RET questions the taxonomic value of this variety because the yellow staining (with the eventual transition to red-brown in the stem) suggests the "yellowing syndrome" seen in other species of section Lepidella in Eastern North America. The unusual degree of gelatinization (decay?) of the cap and the reduction in size of spores are other characteristics that suggest this specimen was diseased. For more notes on the "yellowing syndrome" see A. subsolitaria (Murrill) Murrill.—R. E. Tulloss and L. Possiel
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.
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The field may contain magenta text presenting data from a type study
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Macroscopic descriptions in magenta are a combination of data from the protolog and
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The following text is derived from the protolog of Bas (1969: 499). According to Bas: "The macroscopical characters in the ... description ar taken from an unpublished note by Murrill, present in the library of the University Herbarium at Ann Arbor [ed.—MICH] and apparently meant to be published in Mycologia."
Bas (1969): [25/1/1] 10.0 - 12.0 × 3.5 - 4.5 μm, (Q = 2.5 - 3.2: Q = 2.75 - 3.0), slightly yellowish, cylindric to bacilliform; apiculus not described; contents guttulate: color in deposit not recorded.
from type study of Jenkins (1979): [-/-/1] 10.2 - 11.7 × 3.9 μm, (Q = 2.62 - 3.00; Q' = 2.92),
hyaline, thin-walled, amyloid, cylindric to bacilliform, often adaxially flattened; apiculus sublateral, cylindric; contents guttulate;
color in deposit not recorded.
[Note: Because Jenkins provided only a single measurement for spore width, no sporograph can be generated.—ed.]
Bas (1969): "Terrestrial under 'Phoenix canariensis' [Hort. ex Chabaud] in Florida."
Bas (1969): U.S.A.: FLORIDA—Alachua Co. - Gainesville, Univ. campus, 10.vi.1950 W. A. Murrill F 21676 (holotype, FLAS).
from type study of Jenkins (1979):
U. S. A.: FLORIDA— Alachua Co. - Gainesville,
10.vi.1950 W. A. Murrill F 21676 (holotype, FLAS).
RET suggests that this taxon is based upon a specimen of A. rhoadsii exhibiting the yellowing syndrome (see the closely phenetically related A. subsolitaria).
—R. E. Tulloss
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