The following is based on the original description by Stewart and Grund (1974) with some additional information from Jenkins (1986).
The cap of Amanita solaniolens is 39 - 45 mm wide, dull-yellow to light blond at the margin, abruptly darkening to olive brown at the center, with a greenish tinge over the entire cap, broadly convex to plane, viscid when moist, fibrillose-silky, and with a nonstriate margin. The volva is present as one or two large, flat patches, and creamy white to yellowish white. The flesh is firm and white, except for a narrow creamy white region just under the cap skin.
The gills are free, moderately close, creamy white to yellowish white, 4 - 5 mm broad, with a minutely floccose edge. The short gills are rounded truncate to subattenuate to attenuate, of diverse lengths, unevenly distributed, and common.
The stem is 76 - 92 × 4 - 5 mm, nearly cylindric or narrowing upward, creamy white, staining slightly brownish when bruised, and undecorated except for a slightly fibrillose-silky region near the bulb. The stem is firmly stuffed to nearly hollow. According to the illustration in the original description, the bulb is subabrupt and has some longitudinal splitting as in Amanita brunnescens G. F. Atk. The ring is creamy white to pale yellow, attached near the top of the stem, skirt-like, membranous, and collapsing against the stem. The volva is present on the globose bulb as a narrow free margin and is yellowish white to creamy white and submembranous.
The odor is of old potatoes, and the taste is said to be very mild.
According to the original description, the spores measure (6.6-) 7.2 - 9.0 µm long and are globose to subglobose and amyloid. Clamps are absent at bases of basidia. Jenkins (1986) reported spore measurements as follows: 6.1 - 9.2 × 6.6 - 9.0 µm.
This species was originally described from Nova Scotia, Canada. It occurs solitarily under eastern hemlock (Tsuga canadensis).
RET believes that he has collected this species in the United States north and east of West Virginia. The US material is macroscopically identical with the original description of A. solaniolens; and the holotype of the present species is presently on loan in our lab, but has not been fully revised. With this caveat we here supply the spore data from our collections which suggest a broader range of shape than is indicated by the original description: 7.0 - 8.8 (-10.5) × (5.5-) 6.5 - 8.0 (-9.5) µm, are globose to subglobose to broadly ellipsoid, rarely ellipsoid. For those persons familiar with RET's regional keys and the checklists produced at forays in the northeastern USA, previously collected material has been called "Amanita sp. N20" ("NE20" in Northeast Micological Foray checklists).
We concur with the authors' choice of A. brunnescens as the species most similar to the present one. The former is distinguished by its size, its variable cap coloration, its lack of yellow pigment in the stem ring and volva, the more copious stem ring, and the strong brown staining reactions for which it is named.—R. E. Tulloss and L. Possiel
H. L. Stewart & Grund. 1974. Canad. J. Bot. 52: 338, figs. 14-21, 27.
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The following is derived from the protolog of the present species.
from protolog: 39 - 45 mm wide, dull yellow (3B3) to light blond (4C3) at margin, abruptly darkening to olive brown (4E5 to 4F3) over disc, entirely with distinct greenish tinge, broadly convex to planar, fibrillose silky, viscid when moist; context white, creamy, "hard," 2.5 - 3 mm thick above stipe; margin nonstriate; universal veil as one or two flat proportionately large patches, creamy white to yellowish white (4A2).
from protolog: free, moderately close, creamy white to yellowish white (3A2), 4 - 5 mm broad, with edges sometimes slightly flocculose; lamellulae not described.
from protolog: 76 - 92 × 4 - 5 mm, creamy white, cylindric or narrowing upward, glabrous, slightly fibrillose-silky near bulb, staining slightly brownish when bruised; context thickly stuffed to hollow; bulb proportionately small, subglobose, subabrupt [all per figure]; partial veil superior, pendent, creamy white to pale yellow (3A2), membranous, collapsing; universal veil as short limbate volva, creamy white, membranous.
from protolog: Odor of old potatoes. Taste very mild.
from protolog: (28-) 30 - 36 × (8.4-) 9.6 - 12.0 μm, 4-sterigmate; clamps not observed.
from protolog: On pileus: filamentous hyphae (3-) 5 - 8 (-12) μm wide, hyaline, branching, loosely interwoven; inflated cells plentiful, globose to subglobose to clavate, up to 60 × 20 μm and 76 × 76 μm, terminal. On stipe base: filamentous hyphae 3.5 - 5 μm wide, branching, thin-walled, interwoven, usually constricted at septa; inflated cells scattered, up to 70 × 36 μm, terminal.
from protolog: longitudinally acrophysalidic; filamentous hyphae 3 - 9 μm wide (near exterior surface 3 - 6 μm wide), thin-walled, branching, "usually" constricted at septa in central cylinder ("pith"); acrophysalides up to 210 × 30 μm, thin-walled, scattered and smaller in central cylinder ("pith"), also sometimes subglobose (up to 74 μm long) in pith; vascular hyphae noted in central cylinder ("pith").
from protolog: filamentous hyphae (3-) 4 - 6 (-8) μm wide, branching, loosely interwoven; inflated cells not observed.
from protolog: (6.6-) 7.2 - 9.0 μm long, (Q = 1.0 - 1.1, "usually 1.0"), smooth, amyloid, globose to subglobose; apiculus not described; contents not described; white in deposit. [Note: Sporgraph cannot be generated.—ed.]
RET (from material originally defining the concept of A. sp-N20): [70/3/3] 7.0 - 8.8 (-10.5) × (5.5-) 6.5 - 8.0 (-9.5) µm, (L = 7.9 - 8.2 µm; L’ = 8.0 µm; W = 7.1 - 7.4 µm; W’ = 7.2 µm; Q = (1.0-) 1.03 - 1.27 (-1.35); Q = 1.06 - 1.16; Q’ = 1.11), hyaline, colorless, smooth, thin-walled, amyloid, globose to subglobose to broadly ellipsoid, rarely ellipsoid, sometimes swollen at one end, adaxially flattened; apiculus sublateral, cylindric; contents monoguttlate to multiguttulate, sometimes with additional small granules; white in deposit.
from protolog: Solitary. In humus under Tsuga canadensis or Acer.
from protolog: CANADA: NOVA SCOTIA—Kings Co. - Aylesford, 29.vii.1967 H. L. Stewart 200 (holotype, ACAD 10884); Kentville Ravine, 31.vii.1967 unkn. coll. [H. L. Stewart 215] (paratype, ACAD 10898).
This species is assignable to Amanita [section Validae]—possibly to be included in stirps Brunnescens.
The authors of the present taxon state that, except for spore measurements, microscopic characters were derived from examination only of the holotype.
—R. E. Tulloss
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