name | Amanita sp-ARG01 | ||||||||
author | Tulloss | ||||||||
name status | cryptonomen temporarium | ||||||||
GenBank nos. |
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intro |
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 text is based on original research of R. E. Tulloss. | ||||||||
pileus | ?? - ?? mm (up to 20 mm as dried) wide, sordid white, hemispheric, ?? ; context ?? ; margin nonstriate, ?? ; universal veil absent, as small patches, or as single large calyptra, pallid, perhaps concolorous with pileus surface, or staining reddish brown (as seen in exsiccata), with staining particularly pronounced on underside | ||||||||
lamellae | ?? ; lamellulae ?? . | ||||||||
stipe | ?? - ?? × ?? - ?? mm (up to 34 mm long as dried), ?? ; bulb broadly fusiform to ellipsoid as dried, up to 15 × 10, with stark white interior in some exsiccata; context solid or firmly stuffed, pallid, ?? ; partial veil apical to subapical, white, membranous, thin, skirt-like, persistent although sometimes tearing; universal veil as copious limbate volva, pallid, up to 21 mm from bottom of bulb to highest point on limb as dried, apparently entirely buried (hence, up to nearly two-thirds of overall height of dried basidiocarp buried). | ||||||||
odor/taste | Odor indistinct. Taste not recorded. | ||||||||
macrochemical tests |
none reported. | ||||||||
pileipellis | 25 - 40 µm thick, colorless to pallid brownish, partially gelatinizing just at surface, lacking distinct supra- and subpellis, with some partially gelatinized hyphal stubs arising from surface; filamentous, undifferentiated hyphae 2.5 - 5.1 µm wide, occasionally branching, dominantly subradially arranged; vascular hyphae not observed. | ||||||||
pileus context | filamentous, undifferentiated hyphae 1.9 - 8.1 µm wide, branching, plentiful, in fascicles and singly, thin-walled, with narrowly clavate tip cells, with occasional slightly inflated intercalary segments up to 13.0 µm wide, occasionally with yellowish subrefractive walls; acrophysalides subfusiform to subclavate to clavate to broadly clavate to subcylindric to ellipsoid, plentiful to locally dominating, thin-walled, up to 128 × 33 µm or larger; vascular hyphae not observed. | ||||||||
lamella trama | bilateral; wcs = 20 - 25 µm; central stratum comprising densely interwoven filamentous, undifferentiated hyphae, apparently lacking partially inflated intercalary segments; angle of divergence of largest inflated cells 30±°; subhymenial base dominated by inflated cells, with elongate-ellipsoid to elongate-ovoid cells near central stratum largest (e.g., 30 × 16.0 µm, thin-walled), with obpyriform to ellipsoid cells giving rise to cells of subhymenium or (occasionally) directly giving rise to basidia; filamentous, undifferentiated hyphae 1.5 - 3.5 µm wide, branching; terminal, divergent inflated cells not observed; vascular hyphae not observed. | ||||||||
subhymenium | wst-near = 30 - 50 µm; wst-far = 45 - 65 µm; dominantly comprising small inflated cells (e.g., 10.5 × 8.5 µm) in mature regions, also including partially inflated short hyphal segments, locally pseudoparenchymatous, with 0 - 1 small inflated cells between subhymenial base and base of longest basidia; with basidia arising from cells of both types. | ||||||||
basidia | 39 - 52 × 8.6 - 12.5 (-14.0) µm, 4-sterigmate, with sterigmata up to 5.4 × 1.7 µm; clamps not observed. | ||||||||
universal veil | On pileus, exterior surface: all elements ungelatinized or partially gelatinized and with walls thin or up to 0.5± µm thick; filamentous, undifferentiated hyphae 3.6 - 14.0 µm wide, branching, dominating, without dominant orientation, in fascicles or singly, occasionally with yellowish subrefractive walls, with tip cells narrowly clavate; inflated cells terminal, scattered to moderately common locally, broadly clavate to elongate-ovoid, (e.g., 68 × 36 µm); vascular hyphae not observed. On pileus, interior: at 125× magnification, falsely appearing as dense mass of small subovoid cells; filamentous, undifferentiated hyphae 2.8 - 17.0 µm wide, branching, densely entangled, without dominant orientation, occasionally in fascicles, distinctively broad (see fig. ?? ); inflated cells like those near surface, scattered, obscured by dense tangle of broad hyphae; vascular hyphae not observed. On pileus, lower surface: like interior, but greatly compressed vertically, brownish, and with surface gelatinized or partially gelatinized. On stipe base, exterior surface: ?? . On stipe base, interior: ?? . On stipe base, inner surface: ?? . | ||||||||
stipe context | longitudinally acrophysalidic; filamentous, undifferentiated hyphae 2.5 - 15.2 µm wide, branching, plentiful, sometimes constricted at septa, thin-walled, lacking fusiform intercalary segments; acrophysalides locally dominant away from stipe surface, thin-walled, up to 222 × 43 µm; vascular hyphae not observed. | ||||||||
partial veil | filamentous, undifferentiated hyphae ?? µm wide, ??; inflated cells ??; vascular hyphae ?? µm wide, ??. | ||||||||
basidiospores | [80/4/1] (7.8-) 8.0 - 11.4 (-12.5) × (5.7-) 6.3 - 8.1 (-10.5) µm, (L = 8.8 - 10.1 µm; L’ = 9.4 µm; W = 7.0 - 7.5 µm; W’ = 7.2 µm; Q = (1.12-) 1.15 - 1.51 (-1.60); Q = 1.27 - 1.36; Q’ = 1.31), hyaline, colorless, thin-walled, smooth, amyloid, subglobose to broadly ellipsoid to ellipsoid, adaxially flattened, sometimes swollen at one end, rarely triangular in optical section; apiculus sublateral, cylindric; contents monoguttulate, with or without additional small granules; color in deposit unknown. | ||||||||
ecology | Subgregarious. ??. | ||||||||
material examined | ARGENTINA: BUENOS AIRES—Berazategui, Parq. Pereyra Iraola, 8.vi.1998 student of J. E. Wright s.n. (BAFC 34.883; RET 282-2). | ||||||||
discussion |
From spore size and shape, the best matches among white taxa are Amanita phalloides var. alba, Amanita suballiacea (Murrill) Murrill, and A. herrerae Aroche. However, it seems that the pileus may not have been white; the collector may have mistaken the calyptra of universal veil for the pileipellis. In this case, one must consider A. phalloides (believed to occur at the collecting locality) and A. austroolivacea. The key for the present section indicates the differentiating characters observed to date. Blaaa. | ||||||||
citations | —R. E. Tulloss | ||||||||
editors | RET | ||||||||
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