| name | Amanita flavivolva |
| name status | nomen acceptum |
| author | Murrill |
| english name | "Murrill's Yellow Dust Amanita" |
| cap | The cap of A. flavivolva is 40 - 53 mm wide, plano-convex, pale yellow to yellow with a grayish yellow to brownish orange disc; and it is whitish on the nonstriate, nonappendiculate margin. The cap is up to 3 mm thick above the stem. The volval remnants are friable and yellow (fading to whitish or tan) and easily lost. |
| gills | The gills are narrowly adnexed to subadnate to just free, crowded, white, and up to 5 mm broad. Short gills are present, but their shape has not yet been recorded. |
| stem | The stem is 65 - 80 × 4 - 11 mm, white, discoloring watery brown from handling, cylindric or narrowing upward, and has a slightly flaring apex. The stipe's bulb is reported as ovoid and 18 × 14 mm. The flesh is white and solid. The ring is superior, skirt-like, white, with bits of the yellow volva on its margin. The volva is yellowish and may be present as a slight pulverulence on the top of the stipe's bulb. |
| odor/taste | Odor is reported to be lacking. |
| spores | The spores measure (6.5-) 7.5 - 8.5 (-9.2) × 4.8 - 5.5 (-5.8) µm and are amyloid and ellipsoid to elongate. Clamps are absent from the bases of basidia. |
| discussion |
Amanita flavivolva was originally described from Florida. It is reported to be associated with pines. The data on this species is limited, but thanks to a well-annotated 1993 collection sent to me by Robert S. Williams, I believe that this species belongs with the group of taxa similar to A. flavoconia G. F. Atk. var. flavoconia. Among these, it is most similar to A. elongata Peck.—R. E. Tulloss |
| brief editors | RET |
| name | Amanita flavivolva | ||||||||||||||||||||
| author | Murrill. 1953. Mycologia 45: 794. | ||||||||||||||||||||
| name status | nomen acceptum | ||||||||||||||||||||
| english name | "Murrill's Yellow Dust Amanita" | ||||||||||||||||||||
| MycoBank nos. | 292449 | ||||||||||||||||||||
| GenBank nos. |
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| holotypes | FLAS | ||||||||||||||||||||
| type studies | Jenkins. 1979. Mycotaxon 10: 179. | ||||||||||||||||||||
| 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 not directly from the protolog of the present taxon and not cited as the work of Dr. Z. L. Yang or another researcher is based on original research by R. E. Tulloss. | ||||||||||||||||||||
| pileus | from protolog: 60 - 70 mm wide, convext to broadly convex, pale-yellow with grayish disc, whitish toward margin; context white, unchanging, 4 mm thick above stipe; margin nonstriate, entire; universal veil in sparse, flat patches. | ||||||||||||||||||||
| lamellae | from protolog: adnate, crowded, white, unchanging, with margin fimbriate; lamellulae not described. | ||||||||||||||||||||
| stipe | from protolog: 70 - 90 × 10 - 15 mm, white, unchanging, glabrous, narrowing upward, striate(?"ridged") above partial veil, flocculent-pulverulent below; bulb small, ovoid; context not described; partial veil ample, skirt-like, white, fixed 20 mm below apex, with yellow material of universal veil on edge; universal veil in small, yellow fragments near bulb and in/on substrate. | ||||||||||||||||||||
| odor/taste | from protolog: Odorless. Taste mild, becoming acrid. | ||||||||||||||||||||
| macrochemical tests |
none recorded. | ||||||||||||||||||||
| basidiospores |
from type study of Jenkins (1979): [-/-/1]
7.8 - 8.6 × 5.1 - 5.9 μm, (Q = 1.40 - 1.69; Q' = 1.49), hyaline, thin-walled, amyloid, ellipsoid to elongate, often adaxially flattened; apiculus sublateral, short, cylindric; contents guttulate; color in deposit not recorded. composite of data from all material revised by RET: [21/1/1] (6.5-) 7.5 - 8.5 (-9.2) × 4.8 - 5.5 (-5.8) μm, (L = 8.0 μm; W = 5.4 μm; Q = (1.35-) 1.41 - 1.77; Q = 1.56), ??, smooth, amyloid, ellipsoid to elongate, adaxially flattened; apiculus ??; contents ??; white in deposit. | ||||||||||||||||||||
| ecology |
from protolog: Under Quercus laurifolia. RET: Florida: At 7 - 10 m elev. In sand, with Pinus. | ||||||||||||||||||||
| material examined |
from type study of Jenkins (1979): U. S. A.: FLORIDA— Alachua Co. - Gainesville, 16.vii.1950 W. A. Murrill F 19598 (holotype, FLAS). RET: U.S.A.: FLORIDA—Charlotte Co. - Cecil M. Webb Wildlife Mgmt. Area [26°53' N/ 81°53' W, 7-10 m], 3.iv.1993 Robert S. Williams 439 (RET 089-1). | ||||||||||||||||||||
| discussion |
The following figure compares sporographs for the
present species and A. elongata Peck. | ||||||||||||||||||||
| citations | —R. E. Tulloss | ||||||||||||||||||||
| editors | RET | ||||||||||||||||||||
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| name | Amanita flavivolva |
| bottom links | [ Keys & Checklists ] |
| name | Amanita flavivolva |
| bottom links | [ Keys & Checklists ] |
Spore data sets and their composite
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.
Text and User-Generated Sporographs are published under the Creative Commons License.
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