Amanita sp-N51

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name	Amanita sp-N51
name status	cryptonomen temporarium
author	Tulloss
images	1. Amanita sp-N51, St. Game Lands 63, Clarion, Clarion Co., Pennsylvania, U.S.A.
cap	The cap of A. sp-N51 is 61 - 70 or more mm wide and grayish brown with a suggestion of an olive tint except for the center, which is very dark brown. The cap flesh is white, except for a gray region below the cap skin. The margin is grooved for about two-thirds of the cap radius, and the areas between grooves are decorated with small bumps. There are no remnants of the volva on the cap in the material reviewed to date.
stem	The exannulate stem in this species more or less 95 mm long and 8 to 8.5 mm wide. The ground color is cream. The upper stipe is covered with a fine powderiness for about 30 mm more or less. At the base of the stem is a membranous volval sack (about 22 × 12 - 13 mm) with a white surface reminiscent of an eggshell.
odor/taste	There is no noticeable odor in this species.
spores	The spores of this species measure [22/1/1] (11.0-) 11.3 - 13.0 (-14.3) × (7.4-) 7.5 - 9.5 (-11.0) μm and are almost all ellipsoid and inamyloid. Clamps are expected to be absent from bases of basidia.
discussion	This apparent species was first collected at NAMA 2011 in Clarion Co., Pennsylvania, U.S.A. in forest including Oak, Canadian Hemlock, and Pine. In many species of sect. Vaginatae having a membranous volva, there is a structure inside the volval sack that looks like a smaller, second volva. This is the part of the volva that was originally placed between the gills and the stem in the developing mushroom. In the present species, this structure is apparently very minimal.—R. E. Tulloss & C. Rodríguez Caycedo
brief editors	RET

name

Amanita sp-N51

author

Tulloss

name status

cryptonomen temporarium

GenBank nos.

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accession	locus	voucher	source

intro

The following is based on original research of R. E. Tulloss and C. Rodríguez Caycedo.

pileus

61 - 70⁺ mm wide, grayish brown with suggestion of olive tint (ca. 5D4), with disc a deep brown (near fuligineous), unchanging when cut or bruised, plano-convex, tacky to viscid when moist, dull; context 4.5 mm thick, white, except for gray region below pileipellis, unchanging when cut or bruised, narrowing evenly for ca. half of radius, then membranous to margin; margin tuberculate striate (0.65R), nonappendiculate; universal veil absent.

lamellae

receding with decurrent line on stipe apex, subcrowded, sordid in mass, gray or watersoaked in side view, unchanging when cut or bruised, 5 mm broad, broadest ca. mid-length, with white minutely flocculose edge; lamellulae truncate with 1 noted exception (subattenuate), unevenly distributed, plentiful, of diverse lengths.

stipe

95^± × 8.0 - 8.5 mm, cream, becoming slightly orangish tan from handling, narrowing upward, sometimes somewhat flattened, flaring just at apex, finely pulverulent from apex downward for up to about 30 mm, finely striatulate below; context damaged by larvae in known specimens, off-white, unchanging when cut or bruised, concolorous in larva tunnels, with central cylinder 4.5^± mm wide (after larval damage); exannulate; universal veil as saccate volva, 22 × 12 - 13 mm, firmly membranous, white throughout, with smooth dry exterior suggesting an eggshell, with limb 1^± mm thick at mid-height; limbus internus minimal, appearing as 1 mm deep indentation on inner surface of limb, faint, visible as shadowy line in bright light.

odor/taste

Odor lacking. Taste not recorded.

macrochemical
tests

none recorded.

basidia

66 - 82 × 12.5^- - 13.3⁺ μm, 4-sterigmate, with sterigmata up to ?? × ?? μm; clamps probably absent.

basidiospores

send to graphing tool

composite of data from all material revised by RET & CRC: [90/2/2] (8.5-) 9.7 - 12.5 (-14.3) × (7.0-) 7.5 - 9.5 (-11.0) μm, (L = 10.6 - 11.3 μm; L' = 11.0 μm; W = 8.7 - 8.8 μm; W' = 8.7 μm; Q = (1.09-) 1.13 - 1.44 (-1.55); Q = 1.21 - 1.31; Q' = 1.26), hyaline, colorless, smooth, thin-walled, inamyloid, predominantly ellipsoid, infrequently broadly ellipsoid, at least somewhat adaxially flattened; apiculus sublateral, cylindric or slightly tapered; contents granular or mono- to multiguttulate with additional small granules; color in deposit not recorded.

ecology

At ca. 420 m elev. In forest including Quercus, Tsuga canadensis, and Pinus.

material examined

U.S.A.: PENNSYLVANIA—Clarion Co. - Clarion, St. Game Lands 63, Robert's Hill Rd. [41.1421° N/ 79.2830° W, 419 m], 6.viii.2011 I. V. Hull s.n. [NAMA 2011-260; Tulloss 8-6-11-A] (RET 478-8), D. K. Shankland s.n. [Tulloss 8-6-11-D] (RET 478-4).

citations

—R. E. Tulloss & C. Rodríguez Caycedo

editors

RET

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