name | Amanita merxmuelleri |
name status | nomen acceptum |
author | Bresinsky & Garrido |
english name | "Merxmueller Amanita" |
cap |
The cap of A. merxmuelleri is 65 - 150 mm wide, gray-brown to porphyry-brown, dull or subshiny, viscid in humid conditions, hemispheric to convex when young, later campanulate to planar with a rather depressed disc, with a nonstriate margin. The margin is decurved or slightly incurved at first and sometimes bears hanging parts of the volva. The flesh is whitish. The volva is present as irregularly distributed warts and small patches and are polygonal, clod-like, thicker over the disc, thinner near the margin, reddish-brown, cinnamon to ochre-brown, sometimes gray-brown. |
gills |
The gills are free, crowded, whitish to cream, becoming pale leather color, with the edge colorless at first then becoming gray-brown to chestnut-brown. Short gills are present. |
stem |
The stem is 75 - 150 × 18 - 45 mm, narrowing upward, exannulate, with a mixture of lilac-tinted colors when quite young, later whitish at apex and having a whitish ground below decorated with gray-brown to porphyry-brown to lilac-brown to wine-colored streaks or squamules. The bulb is white, stuffed rather firmly, becoming slightly brownish after exposure to air, pronounced in young material, but reduced to a swollen base of then-clavate stem or only slightly broader than the stem in mature material. The flesh is whitish, mostly unchanging on exposure to air, but faintly browning in the base. The volva is present as a single ring of fine warts at the meeting point of stem and bulb and is concolorous with volva on the cap. |
odor/taste |
The odor is similar that that of raw potatoes, and the taste is reported as similar to asparagus. |
spores |
The spores measure (10.1-) 10.6 - 14.0 (-15.0) × (6.5-) 6.8 - 9.0 (-10.1) µm and are ellipsoid to elongate, infrequently broadly ellipsoid and inamyloid. Clamps are common at the bases of basidia. |
discussion |
The following have all been shown to be absent from A. merxmuelleri: amanitins, phalloidin, muscimol, muscarin. A. merxmuelleri is present in association with Nothofagus pumilio. The present species seems so close to the following that the names may be taxonomic synonyms: Amanita ushuaiensis (Raithelh.) Raithelh. and Amanita grauiana Garrido. According to Dr. Rolf Singer's notebooks (Field Natur. Hist. Mus.) he collected material probably of this species on which crassospores were plentiful. These unusual, malformed spores with a surface suggesting the dimple on a golf ball have been noted in other taxa collected in certain regions of the Argentine Andes (A. morenoi Raithelh. and A. pseudospreta Raithelh.). This species may have been reported under various other names in the past including A. umbrinolutea in the sense of Raithelhuber. The reader may wish to compare A. merxmuelleri to A. umbrinella E.-J. Gilbert & Cleland and A. murinoflammeum Tulloss, A. M. Young & A. E. Wood which share a great number of characters with the present species.—R. E. Tulloss |
brief editors | RET |
name | Amanita merxmuelleri | ||||||||
author | Garrido & Bresinsky. 1985. Bot. Jahrb. Syst. 107: 524, figs. 1(a-f), 2(a-d). | ||||||||
name status | nomen acceptum | ||||||||
english name | "Merxmueller Amanita" | ||||||||
etymology | genitive of Latinized name, "Merxmueller's" or "of Merxmueller" | ||||||||
MycoBank nos. | 103991 | ||||||||
GenBank nos. |
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holotypes | M | ||||||||
pileus | 65–150 mm wide, gray-brown to porphyry-brown, hemispheric to convex when young, later campanulate to planar with rather depressed disc, dull or subshiny, viscid in humid conditions; context whitish; margin not striate, not pellucid, decurved or slightly incurved at first, sometimes bearing hanging bits of the veils; universal veil as irregularly distributed warts and small patches, polygonal, clod-like, thicker over disc, thinner near margin, reddish brown, cinnamon to ocher-brown, sometimes gray-brown (then more or less concolorous with the pileipellis). | ||||||||
lamellae | free, crowded, whitish to cream, becoming pale leather color, with edge colorless at first then becoming gray-brown to chestnut brown; lamellulae present. | ||||||||
stipe | 75–150 × 18–45 mm, with a mixture of lilac-tinted colors when quite young, later whitish at apex and having a whitish ground below decorated with gray-brown to porphyry-brown to lilac-brown to wine-colored streaks or squamules (in linear arrangement in younger specimens and becoming a similarly colored snakeskin pattern of colored fibrils in older ones), narrowing upward; bulb white, stuffed rather firmly, becoming slightly brownish after exposure to air, pronounced in young material, but reduced to swollen base of then clavate stipe or only slightly broader than stipe in mature material; context whitish, mostly unchanging on exposure to air, but faintly browning in base; exannulate; universal veil as single ring of fine warts at meeting point of stipe and bulb, colored as on pileus. | ||||||||
odor/taste | Odor close to raw potatoes; taste like asparagus. | ||||||||
macrochemical tests |
10% KOH - negative; phenol - violet on pileipellis, stipe, and in context. The following all failed to be detected from A. merxmuelleri by thin-layer chromatography (Garrido & Bresinsky 1985: 526): Muscimol, muscarin, amanitin, and phalloidin. | ||||||||
basidia | 62–77 × 13–15 µm, ??-sterigmate, with sterigmata up to ?? × ?? µm; clamps common. | ||||||||
basidiospores | [18/1/1] (10.1–) 10.6–14.0 (–15.0) × (6.5–) 6.8–9.0 (-10.1) µm, (L = 12.5 µm; L' = 12.5 µm; W = 8.0 µm; W' = 8.0 µm; Q = (1.25-) 1.34–1.80 (-2.11); Q = 1.58; Q' = 1.58), hyaline, colorless, thin-walled, smooth, inamyloid, adaxially flattened, ellipsoid to elongate, infrequently broadly ellipsoid; apiculus sublateral, cylindric to irregular; contents granular; ?? in deposit. | ||||||||
ecology | Under Nothofagus pumilio. | ||||||||
material examined |
CHILE: MAGALLANES Y LA ANTARTICA—Punta Arenas, Rio las Minas, 7.iii.1984 A. Bresinsky & N. Garrido 26a (holotype, M n.v.; isotype, CONC n.v.; isotype, ZT (Horak)), 26b (paratypes, CONC n.v. & M n.v.).
LOS LAGOS—Valdivia, Universidad Austral Chile, Facultad Ciencias Biológicas, jardín del estacionamiento,
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discussion |
Blaaa.... Singer seems to have used the unpublished herbarium name “Amanita umbrinella f. exannulata” for some specimens of the present species (or something extremely close to it). The sources of the following description are collection labels, Singer’s notes on his M1773 in his Amanita notebook, examination of the exsiccatum, and ??: | ||||||||
citations | —R. E. Tulloss | ||||||||
editors | RET | ||||||||
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