The cap of A. beckeri is up to 120 mm wide, hemispheric,
becoming convex, more rarely campanulate, not umbonate,
slightly viscid, smooth, with a striate-sulcate margin.
The cap is golden walnut over disc, a little paler and
often more ochraceous towards the margin when young. The
cap's flesh is rather thin and fragile, white, browning
slightly. The volva covers the cap with white warts, that
become browner with age, but never become gray or black.
The gills are free, white to cream at first and finally become silvery gray; they are up to 12.5 mm broad, though they may be concave especially in young specimens. The gills may have brownish spots appearing in age. The short gills are few in number and truncate.
The stem is 100 - 200 × 12
- 20 mm, straight and thin, exannulate, cylindric to
narrowing slightly upward. It is decorated near the apex
with fine longitudinal striations that are at first white
and then turn brown. The flesh is white, browning
slightly on exposure, at first stuffed, then hollow. The
volva is white, becoming brownish, not very coherent,
leaving a belt of tissue around the lower stem not far
from its base, and forming a small cup at the stem's base.
The spores measure (8.8-) 9.8 - 11.8 (-13.0) × (7.2-) 9.0 -
11.0 (-12.2) µm and are inamyloid and globose to subglobose (occasionally
broadly ellipsoid). Clamps are absent from bases of the basidia.
I have tentatively placed A. beckeri near A. ceciliae (Berk. & Broome) Bas, but the failure of the gills to turn gray with age and the non-graying volva may require a change in this thinking. Another taxon with non-graying gills and weak, non-graying volva that may take on brownish or rusty tints is A. populiphila Tulloss & E. Moses. Known from the Central Plains and eastern Rocky Mountain states of the U.S., the latter is a smaller species with a pileus that is white at first.
The species was originally described from France and is known from Europe. The Wuilbaut collection (see the "images" tab) was examined by Dr. C. Bas.—R. E. Tulloss
Huijsman ex Huijsman. 1962a. Bull. Trimestriel Soc. Mycol. France 78: 217.
"Becker's Ringless Amanita"
≡Amanita beckeri Huijsman nom. inval.1962 ["1961"]. Bull. Trimestriel Soc. Mycol. France 77: 349. [Holotype not cited. ICBN §37.1.]
=Amanita strangulata sensu Huijsman. 1959. Bull. Trimestriel Soc. Mycol. France 75: 24.
non Agaricus strangulatus Fr. nom. dub.
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 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 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 upon original research by R. E. Tulloss.
protolog: up to 120+ wide, ochraceous brown (intense tan), "brun havane" [Havana brown] [But see note below.—ed.] (Séguy 134) or closer to "noisette doré" [golden hazel brown] over disc, paler and often more ochraceous toward margin especially in young specimens, hemispheric. then convex, rarely campanulate, expanding to planar and sometime concave, not umbonate, smooth, viscid; context white, lightly browning, not very thick, fragile, soon losing turgidity and collapsing and liquifying; margin nonappendiculate, striate-sulcate (up to 0.25 - 0.35R), short-striate in early development (per. figure), with grooves cloven by pileus expansion and often splitting lamellae and exposing lamella trama; universal veil in rather numerous flooculose-tomentose polygonal warts rarely exceeding 5 mm in width, white at first, finally brown, never turning gray or blackening at all (hence distinguishable from A. ceciliae).
[Note: During study of the isotype, an error in the published report of the pileus color in the protolog was found. Séguy's 134 is not "brun havane" it is "gris noisette" an ochraceous tan more yellow and slightly browner than 2.5YR 6/6. This error has caused mycologists to mistakenly expect A. beckeri to have a pileus that is intensely red-brown.—ed.]
protolog: free, close, white to cream, taking on brown spots with age, not very broad, with edge noticeably concave especially in youn material, not very broad, with finely fimbriate edge becoming brownish with age; lamellulae truncate, not very common.
protolog: 100 - 200 × 12 - 20 mm, cylindric or narrowing upward slightly, decorated above striations of material from gill edges, with [underlying stipe surface] longitudinally striatulate, decorated by appressed garland-like zones with thickness reducing upward from that of "belt" of limbus internus [see below] to very thin near the apex; context white at first, then browning slightly, stuffed at first, becoming hollow; exannulate; universal veil as cupulate volva and with limbus internus left as noticeable "belt" encircling the stipe (often with triangular cross-ection at first per figure) and separated from basal part of volva by short distance, white then brownish.
protolog: Odor at first weakly radish-like, soon fetid. Taste not distinctive.
Tulloss (1994): 145 - 150 μm thick in young basidiome (just prior to sporulation), with partial to extensive gelatinization at surface, pale yellowish near surface grading into deep orange-brown at interface to pileus context; filamentous undifferentiated hyphae 2.8 - 5.8 μm wide, subradially arranged, densely interwoven; vascular hyphae not observed.
Tulloss (1994): filamentous undifferentiated hyphae 2.8 - 15.0 μm wide, branching, plentiful; acrophysalides thin-walled, dominating, apparently terminal singly, fusiform to clavate to broadly clavate to ellipsoid to pyriform to subreniform, up to 115 × 52 μm; vascular hyphae not observed.
Tulloss (1994): bilateral, divergent; wcs = 35 - 50 μm; angle of divergence acute to nearly perpendicular to central stratum; filamentous undifferentiated hyphae 2.0 - 8.5 μm wide, terminal divergent inflated cells apparently absent; vascular hyphae not observed.
[Note: Quality of rehydration achieved is not recorded. This work should be done over.—ed.]
Tulloss (1994): wst-near = 20 - 45 μm; wst-near = 50 - 75; as tangle of frequently branching hyphae, with occasional segments (including branched segments) slightly inflated, with basidia arising from segments roughly perpendicular to central stratum.
[Note: Quality of rehydration achieved is not recorded; nor is the state of maturity of the gills recorded. This work should be done over.—ed.]
Tulloss (1994): 40 - 64 × 14.2 - 17.5 μm, dominantly 4- and infrequently 3-sterigmate, thin-walled; clamps not observed.
protolog: filamentous hyphae forming open matrix, 2 - 5 μm wide; inflated cells with diameter up to 60 - 70 μm, terminal usually singly and sometimes in chains; vascular hyphae numerous.
Tulloss (1994): At stipe base, exterior surface: orange-brown, extensively gelatinized; filamentous undifferentiated hyphae 2.5 - 6.2 μm wide, often in fascicles; inflated cells as in interior [below] but smaller, collapsed, gelatinized; vascular hyphae not observed. At stipe base, interior: filamentous undifferentiated hyphae 2.2 - 11.8 μm wide, plentiful, frequently branching, at times in fascicles; inflated cells plentiful, ellipsoid to broadly clavate to clavate, up to 95 × 50 μm, terminal, thin-walled, largest away from surfaces; vascular hyphae not observed. On pileus, exterior surface: as on stipe base. On pileus, interior: with proportionately fewer hyphae than on stipe base; filamentous undifferentiated hyphae 2.0 - 10.8 μm wide, frequently branching, plentiful; inflated cells ovoid to ellipsoid to subglobose, thin-walled, terminal singly or in short chains (of up to three cells), up to 63 × 45 μm, plentiful; vascular hyphae not observed.
Tulloss (1994): longitudinally acrophysalidic; filamentous undifferentiated hyphae 1.5 - 10.0 μm wide, branching, plentiful, dominating near exterior surface; acrophysalides thin-walled, up to 139 × 39 μm, plentiful in interior; vascular hyphae uncommon, 7.0 - 19.0 μm wide, locally in loose tangles.
From isotype in L (Tulloss, 1994): [29/2/1] (8.8-) 9.8 - 11.8 (-13.0) × (7.2-) 9.0 - 11.0 (-12.2) μm, (L = 10.5 - 11.0 μm; L' = 10.8 μm; W = 10.0 - 10.2 μm; W' =10.1 μm; Q = (1.0-) 1.03 - 1.13 (-1.22); Q = 1.05 - 1.08; Q' = 1.07), hyaline, colorless, smooth, thin-walled, inamyloid, globose to subglobose, infrequently broadly ellipsoid, infrequently pip-shaped, at least somewhat adaxially flattened, sometimes expanded at one end; apiculus sublateral, cylindric; contents granular to monoguttulate with small additional granules
protolog: Solitary to subsolitary to gregarious. In very wet periods only, in deciduous woods on calcareous soils.
protolog: FRANCE: DOUBS—Lougres, Bois du Cré, 29.vii.1956 G. Becker & H. S. C. Huijsman s.n. [Huijsman 4275] (holotype, L 955.239-091; isotype, L 956.110-613).
Tulloss (1994): FRANCE: DOUBS—Lougres, Bois du Cré, 29.vii.1956 G. Becker & H. S. C. Huijsman s.n. [Huijsman 4275] (isotype, L 956.110-613).
The protolog is in three parts, with the final paper (Huijsman 1962a) providing the designation of the type. The most complete description of the species appears in the first of the three papers (Huijsman 1959), where the name provided for the mushroom is A. strangulatus. In the second paper (Huijsman 1962) the epithet "beckeri" is introduced although invalidly.
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