The cap of Amanita limbatula is 25 - 50 mm wide, convex
to plano-convex, white to creamy white, entirely pulverulent-subflocculose, appendiculate, with a slightly
sulcate, somewhat inflexed margin. In young specimens and at the center of the cap in older specimens, it is
covered with small, vague, concolorous to slightly paler, felted-subflocculose, adnate, flat patches of volva.
The gills are moderately crowded, narrowly adnate to just free, rather broad to broad, whitish, and broadly rounded near the margin of
the cap. The short gills are rounded-truncate to attenuate.
The stem is 25 - 50 × 5 - 8 mm, subcylindrical,
pulverulent-flocculose, with a tender, appressed,
whitish, submembranous-felted volval limb
sometimes disappearing with age.
The spores of the type collection measure 9 - 11 (-13) × 4.5 - 6 (-6.5) µm, according to Dr. Bas, and are amyloid and elongate to cylindric. Clamps are present at bases of basidia. Spores from recently collected and well-dried material measured (9.6-) 10.0 - 12.0 (-12.2) × (4.0-) 4.5 - 5.5 µm.
Amanita limbatula is a species known from only a few collections made in the sandy Atlantic Coastal Plain of the
eastern U.S.A. The dominant forest type in which it occurs is pine-oak. Its type was collected on Long Island
in New York State; it has been recently found in quantity in Tallahassee, Florida. At least two collections that may belong
to this species have been found considerably inland in the middle Appalachian Mountains.
Amanita limbatula is the type species of Amanita subsection Limbatulae
Bas. This subsection comprises three stirpes of lepidellas with limbate volvas: stirps Limbatula,
stirps Preisii (see A. preissii (Fr.) Sacc.), and stirps Roanokensis
(see A. roanokensis Coker).—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.
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 where noted from the revision of Bas (1969); the remainder is based on original research of R. E. Tulloss.
protolog: 25 - 55 mm wide,white to creamy white, with surface only exposed in one older specimen and then in very limited region near margin and slightly polished, convex to planoconves; context ?; marginuniversal veil entirely covering pileus of younger specimens with pulverulent-subfloccose layer, concolorous with pileus, in older specimens as small vague concolorous or slightly paler felted-subflocculose adnate flat patches.
protolog: narrowly adnate to just free, moderately crowded, whitish, up to 5 mm broad, ventricose to subventricose, broadly rounded at pileus margin, with edge entire and subfloccose to glabrous; lamellulae rounded truncate (the shorteset) to attenuate (the longer).
protolog: 25 - 50 × 5 - 8 mm, subcylindric; bulb submarginate to marginate, , turbinate to subglobose to elongate-ellipsoid, ca. 10 - 20 × 10 - 14 mm; context solid; partial veil thin, incoherent, apicsl, stirate above, leaving few remnants or entirely detersile; universal veil as weakly structured, appressed, whitish submembranous-felted limb, up to 2 mm wide on bulb margin, sometimes disappearing with age.
protolog: Odor weak or lacking. Taste not recorded.
protolog: as dense layer of interwoven hyphae, gelatinizing near surface; filamentous hyphae 2 - 8 μm wide; vascular hyphae plentiful in interior.
protolog: bilateral; probably with terminal inflated cells.
protolog: ramose, becoming more or less coralloid with age.
protolog: 40 - 50 × 9 - 10 μm, 4- or 2-sterigmate; clamps rather frequent.
protolog: On pileus: with elements irregularly disposed, pale yellow to yellow in alkaline solution; filamentous hyphae 3 - 8 μm wide, rather abundant, branching, densest near upper surface; inflated cells globose to ellipsoid )up to 50 × 30 μm, terminal singly or in short chains) or up to 80 × 40 μm (elongate to clavate), with elongate-ellipsoid and clavate cells most common near upper surface. On stipe base: similar to tissue on pileus.
protolog: longitudinally acrophysalidic; acrophysalides up to 300 × 40 μm, often with belts of colorless incrustations.
protolog: [70/4/1] 9.0 - 11.0 (-13.0) × 4.5 - 5.0 (-6.5) μm, (Q = 1.70 - 2.20 (-2.40); Q = 1.80 - 2.10), colorless, hyaline, thin-walled, amyloid, elongate to cylindric, often slightly enlarged towards base or apex; apiculus not described; contents subguttulate; color in deposit not recorded.
from type study of Jenkins (1978a): [-/-/1]
8.6 - 10.2 × 3.9 - 5.5 μm, (Q = 1.83 - 2.2; Q' = 1.93),
hyaline, thin-walled, amyloid, elongate to cylindric, often adaxially flattened; apiculus sublateral, cylindric, truncate-conic; contents guttulate;
color in deposit not recorded.
protolog: "In the box with the type material I found five specimens, one clearly distinct from the others because of a long slender stem without a volval limbon the bulb, narrow, very crowded gills, and microscopical differences.
"Inside the type box I found a loose label similar to that on the outside, except that the word 'type' was lacking, the date was 'Aug. 1906' instead of '18 Aug. 1906' and the words 'Long stem form' were added. Apparently two collections had been put together. The loose label probably belongs to the aberrant specimen (see A. longipes [Bas 1969] p. 459).
"It is possible that, in the tissue at the surface of the patches on the cap, hyphae are still more abundant than in the tissue depicted in [Bas 1969] fig. 318, but the outer surface is moulded and hard to analyze.
"Because of the elongate to cylindric spores, the presence of clamps, and the formation by the volva of a slight limb at the base of the stem, A. limbatula must be placed near A. praelongispora and A. parva. It differs from both in having a less gelatinized pileipellis in connection with which the cap is almost completely covered with pulverulent remnants of the volva, and also in having a very incoherent partial veil that does not form a true ring. Moreover, A. limbatula has shorter and less elongate spores than A. praelongispora and a very thin, appressed, somewaht irregular margin of the cap instead of a sterile, projecting margin as in A. parva."
—R. E. Tulloss and N. Goldman
Information to support the viewer in reading the content of "technical" tabs
can be found here.
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.