The cap of Amanita advena is 85 - 120 mm wide, viscid when moist,
broadly convex to slightly concave at maturity, dry,
becoming areolate, appendiculate, decurved at first,
becoming rimose, with a nonstriate margin. The cap is
white to light buff when young, becoming tinged with
cinnamon in time, with no other discoloring. The flesh is
whitish buff. The volva is white at first, then brown,
breaking into flattened to slightly crumpent, large warts to small patches, at times in concentric rings.
The gills are free, close, light
cream, becoming dingy ochraceous in age near the cap
margin, strongly fimbriate. The short gills are numerous.
The stem is 110 - 130 × 15 - 25 mm, buff, becoming cinnamon abose the basal bulb, narrowing
upward, membranous to submembranous, striate above,
smooth below. The volva is white at first, browing, and
in a series of obscure rings from a point slightly above
the top of the bulb to a point below the broadest point of the bulb.
The spores measure (8.5-) 9 - 12.5 (-14.0) × (6.5-) 7.0 - 9.5 (-10.2) µm and are broadly
ellipsoid to ellipsoid (occasionally subglobose,
infrequently elongate) and amyloid. Clamps are present at bases of basidia.
Known only in association with oak in cloud forest of Andean Colombia (from which the
species was originally described) and Costa Rica (where
it appears to be more common, especially in the Cordillera Talamanca).—R. E. Tulloss
Tulloss, Ovrebo & Halling. 1992. Mem. New York Bot. Gard. 66: 19, figs. 13-15, 3
The species belongs to a stirps very rarely represented in South America.
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HUA; isotype, NY
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).
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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 is based on original research by R. E. Tulloss.
85 - 120 mm diam., whitish to light buff when young, becoming tinged with cinnamon in time, not otherwise discoloring, viscid when moist, in maturity broadly convex to slightly concave, dry, becoming areolate; context whitish buff, 10? mm thick; margin nonstriate, appendiculate, decurved at first, becoming rimose; universal veil as flattened to slightly erumpant, large warts to small patches, at times in concentric rings, white at first, then browning.
free, close, light cream, becoming dingy ochraceous in age near pileus margin, 8 - 11 mm broad, with edge strongly fimbriate; lamellulae numerous.
110 - 130 × 15 - 25 mm, buff, becoming cinnamon above basal bulb, narrowing upward, surface scabrous in places, also breaking into scales; bulb ovoid, tapering to rounded point, white mycelial "threads" present on lower third; context
??; partial veil at very apex, white, then browning in spots, membranous to submembranous, striate above, smooth below, margin thickened, becoming lacerate; universal veil remains whitish at first, browning, in series of obscure rings from slightly above top of bulb to below broadest part of bulb.
Odor slightly putrid. Taste indistinct.
3% KOH - light ochraceous on stipe, faintly yellow on less mature pileus. Test voucher: holotype.
yellowish brown to nearly colorless, rather thin, 30 - 90 µm thick, only gelatinizing at surface; filamentous, undifferentiated hyphae 1.5 - 10.0 µm wide, branching, subradially oriented, interwoven; vascular hyphae 2.8 - 9.5 µm wide, branching, locally plentiful.
filamentous, undifferentiated hyphae 2.5 - 14.5 µm wide, branching; acrophysalides subglobose to ovoid to clavate to ellipsoid to elongate, dominant, up to 86 × 64 µm; vascular hyphae 4? µm wide, scarce.
bilateral, divergent; wcs = 50?? µm (poor to moderate rehydration); subhymenial tree as branching structure of inflated and partially inflated cells, more frequently inflated in subhymenium than in subhymenial base; filamentous, undifferentiated hyphae 1.2 - 11.5 µm wide, branching, with some segments partially inflated (up to 18.0 µm wide), occasionally loosely coiling locally, sometimes with yellowish subrefractive walls; inflated cells ellipsoid to elongate to clavate to pyriform, up to 71 × 49 µm; branching vascular hyphae reported originally as "2.2 - 6.2 µm wide, common, locally plentiful in knots," not observed in 1995 review; clamps present.
wst-near = 45+ - 55+ µm (moderate to good rehydration); wst-far = 70+ - 80+ µm (moderate to good rehydration); locally appearing cellular (pseudoparenchymatous), branching structure evident in other regions, with basidia arising from subglobose and clavate inflated cells and from partially inflated hyphal segments.
(28-) 41 - 63 × 11.0 - 17.5 (-27) µm, dominantly 4-sterigmate, also 3-, 2-, and occasionally 1-sterigmate; clamps and proliferated clamps present.
On pileus: gelatinizing on top and bottom surfaces; becoming orange-brown in some regions on upper surface of wart, but always browner than adjacent pileipellis; alignment of elements subvertical; filamentous, undifferentiated hyphae 1.8 - 15.0 µm wide, branching, interwoven, constricted at septa when of larger diam., rather plentiful near upper surface, dominant near bottom surface; inflated cells plentiful, thin-walled, single when terminal, subglobose to subpyriform to clavate to elongate, up to 122 × 53 µm; vascular hyphae present, branching, 1.8 - 8.5 µm wide. On stipe base and upper bulb: with same pigmentation as on pileus, with elements more often collapsed, but of very similar shapes and sizes to those on pileus; orientation of elements not discernible; inflated cells up to 107 × 70 µm; vascular hyphae scarce.
longitudinally acrophysalidic; filamentous, undifferentiated hyphae 1.0 - 14.0 µm wide, branching; acrophysalides plentiful to dominant, up to 278 × 84 µm; vascular hyphae 2.5 - 12.5 µm wide, branching, locally in dense tangles and knots; clamps present.
filamentous, undifferentiated hyphae 4.8 - 13.5 µm wide, branching, often with subradial orientation, with narrow diameter elements having unconstricted septa and long segments, with larger diameter elements having constricted septa and relatively short segments; inflated cells terminal, relatively common, clavate to broadly clavate, to 94 × 47 µm; vascular hyphae 1.5 - 5.5 µm wide, scarce.
Subgregarious to gregarious. Colombia: at 2500? - 3000 m elev. In Quercus humboldtii forest. Costa Rica: In forest including Q. seemannii and Q. copeyensis.
COLOMBIA: ANTIOQUIA—Mpio. San José de la Montaña - along rd. from San José de la Montaña to Labores, 26.xi.1986 C. L. Ovrebo 2547 (holotype, HUA; isotype, NY).
COSTA RICA: SAN JOSÉ—Ctn. Dota - San Gerardo de Dota no. 1, 5± km SW of Cerro de la Muerte, Albergue de Montaña Savegre (Cabinas Chacón) [9°33’2” N/ 83°48’27” W,
2200 to ca. 2350 m], 28.vi.1998 R. E. Halling, R. H. Petersen, J. Cifuentes, J. L. Mata [Halling] 7773 (NY).
—R. E. Tulloss
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