name | Amanita marginata |
name status | nomen acceptum |
author | Dav. T. Jenkins |
english name | "Curtained Lepidella" |
intro |
The following is largely drawn from the description of Jenkins (1986). |
cap |
The cap of A. marginata is 75 - 130 mm wide, convex, white to creamy-white, slightly appendiculate, and having a nonstriate margin. It appears to the naked eye that the skin of the cap extends well-beyond the ends of the gills and hangs as a short membranous curtain with volval material on its lower edge. The volva is present as fibrous, adnate, irregularly shaped warts, more or less in an arrangement of concentric rings. |
gills |
The gills are subcrowded to very crowded, free or connected by a line to the stipe, cream, and fairly broad. They sometimes are anastomosed. The short gills are numerous, of diverse lengths, and subattenuate to attenuate. |
stem | The stem is 70 - 105 × 15 - 21 mm, solid, white, fibrillose-scaly, becoming lacerate-scaly towards the base, with volval remnants as concentric rings of adnate, slightly recurved scales on the upper part of the rather broad, turnip-shaped or fusiform bulb. The annulus is apical, creamy white, large, pendent, thick, striate above, and floccose below. However, it is also very loosely structured and may soon fall away. A considerable amount of volval material may appear on the underside at the edge of the annulus |
spores | The spores measure 7.0 - 10.2 × 5.5 - 6.2 µm and are weakly amyloid and ellipsoid to elongate. Clamps are absent at bases of basidia. |
discussion |
Amanita marginata occurs in mixed decidous and coniferous forests. Jenkins originally described the species from Tennessee (GSMNP) and later stated it was known from Delaware, New York, and Pennsylvania in addition (Jenkins, 1986). In the same region, there occurs an undescribed species of section Lepidella with a similarly marginate cap; but this taxon can be separated by its much narrower, very deeply radicating bulb (a cup of coffee to the person who finds the bottom!); much more poorly defined, floccose annulus; more gracile form; and larger spores. The author of this species assigned it to Bas' stirps Strobiliformis.—R. E. Tulloss |
brief editors | RET |
name | Amanita marginata | ||||||||
author | Dav. T. Jenkins. 1981. Mycotaxon 13: 112, fig. 1. | ||||||||
name status | nomen acceptum | ||||||||
english name | "Curtained Lepidella" | ||||||||
MycoBank nos. | 112109 | ||||||||
GenBank nos. |
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holotypes | in herb. Dr. David T. Jenkins, Univ. of Alabama, Birmingham | ||||||||
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 description is entirely derived from the protolog of the present species (Jenkins 1981). | ||||||||
basidiospores | [-/-/-] 7.0 - 10.2 × 5.5 - 6.2 μm, (Q = 1.25 - 1.62; Q = 1.51), hyaline, thin-walled, weakly amyloid, ellipsoid to elongate, adaxially flattened; apiculus sublateral, short cylindric; contents guttulate; white in deposit. | ||||||||
ecology | Terrestrial. In mixed coniferous and deciduous forest. | ||||||||
material examined | U.S.A.: TENNESSEE Blount Co. - GSMNP, Cades Cove, Loop Rd., 17.viii.1972 David T. Jenkins 580 (holotype, in herb. Dav. T. Jenkins, Univ. Alabama, Birmingham). | ||||||||
discussion |
The author of the present species placed in Amanita subsection Solitariae Bas and considered that within that taxon, it could belong in Bas' stirps Strobiliformis. In over 30 years of collecting in the eastern and southeastern U.S., RET has never determined any material fitting the description of the present species. One taxon of Amanita subsection Solitariae with a notable sterile margin of the pileus that is occasionally found in the southeastern U.S. is A. magniradix; however, it is easily segregatable from the present species by size and shape of spores (see sporograph, below), a deeply radicating basal bulb on its stipe, a floccose partial veil, etc. The only known illustration of the present species was published in the protolog. On the grounds that the species appears to have some gross similarity to A. cokeri and A. subcokeri, a comparison of the sporographs of the three species is provided here: Material fitting the description of A. marginata is solicited by RET who would find such material of great interest. | ||||||||
citations | —R. E. Tulloss | ||||||||
editors | RET | ||||||||
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name | Amanita marginata |
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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.