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 is based on original research of R. E. Tulloss and collecting notes and photographs of Renée Lebeuf.
29 - 65 mm wide, gray to dark brown over disc, becoming paler olive gray to grayish brown to greenish brown near margin, darkening when scratched (like line drawn with finger on velvet), dull, matte when moist; context 6± mm thick above stipe, white except for dark gray zone extending 1-2 mm below pileipellis in disc, unstaining, narrowing evenly for 85% of radius toward margin then membrane to margin; margin striate (0.3±R), nonappendiculate; universal veil absent or as verruculose warts or small patches with edges raised at cap maturity, pale brownish gray at first, becoming distinctly browner with age and exposure.
free to receding with or without decurrent line on upper stipe, somewhat close to subcrowded, pale brown-gray in mass, white to off-white to grayish white in side view, graying with exposure, with minutely flocculose edge, 6± mm broad, broadest ca. mid-length; lamellulae dominantly truncate, also subtruncate to rounded truncate, plentiful, unevenly distributed, occasionally absent between a pair of adjacent lamellae, of greatly varying lengths, infrequently originating at stipe rather than margin.
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60 - 142 × 3 - 9 mm, white to pale grayish, becoming grayish from handling, narrowing upward, flaring at apex, fibrillose for much of length, matte to pulverulent above, sometimes flocculose in lower 20± mm at first, with surface fibrils pale beige to pale brownish gray to gray, darker gray with age; context hollow, white, without staining, with central cylinder up to 5- mm; exannulate; universal veil as white cupulate volva at stipe base and as friable and cracking pale brownish gray volval limb loosely appressed to stipe immediately cupulate portion or above strangulate region topped by uneven dark line (probably limbus internus), with limb fragments becoming darker with age.
Odor lacking or faintly of green corn husk. Taste not recorded.
[30/1/1] (9.6-) 9.7 - 14.5 (-16.6) × 8.8 - 13.6 (-14.7) μm, (L = 11.2 μm; L' = 11.2 μm; W = 10.4 μm; W' = 10.4 μm; Q = (1.04-) 1.05 - 1.14 (-1.15); Q = 1.08; Q' = 1.08), hyaline, colorless, smooth, thin-walled, inamyloid, globose to subglobose, adaxially flattened or at least somewhat so; apiculus sublateral, cylindric; contents monoguttulate; white in deposit
Solitary or in small groups. Quebec: In moist soil and litter of mixed decidous-coniferous woods including Pinus. Maine: In "mixed woods" with plentiful Acer. New York, U.S.A.: Under Populus tremuloides and Acer rubrum.
CANADA: QUÉBEC—Unkn. Co. -
Île Perrot, boulevard St.-Joseph, 26.viii.2011 Renée
Lebeuf HRL0844 (in herb. R. Lebeuf; RET 505-1,
MAINE—Penobscot Co. - Orono, James Hinds'
Woods, 11.viii.2007 Janet Eckardt s.n. [Tulloss
8-11-07-B] (RET 409-9, nrITS & nrLSU seq'd.).
NEW YORK—Schuyler Co. - Fingler Lakes Nat.
For., 21.vii.2013 Isabel V. Hull s.n. (RET 553-4,
nrITS & nrLSU seq'd.).
Among other things, this species is distinguished
rhacopus by the browning of the volval
warts on the cap, the cap pigmentation, the
floccose nature of the lower stipe, and the failure
of the limbus internus to form a dark ring around
the lower stipe in dried specimens. The
latter characteristic is typical of species like
sinicoflava, in which the universal veil
becomes gray and friable later in development than
does that of such taxa as A. ceciliae, A.
rhacopus and A.
sororcula. The reader may also wish to
Based on initial and incomplete genetic studies,
the nrITS sequence of this species segregates it
from A. rhacopus and other sequenced taxa of
the Vaginatae having a friable, graying
volva including another possible taxon from eastern
North America, A.
texasorora. It also appears to be
distinct from A. sinicoflava
(see above). The following sporograph
comparison may over emphasize the spore size and
shape difference between A. sinicoflava and
the present species because of the presence of
giant spores on the hymenium of the original
example of A.
Likewise the sporograph comparison of the present species with A. rhacopus and A. texasorora are of reduced utility for the same reason:
In globose-spored taxa, sporographs are most useful when all species are represented by large spore measurement sample sizes, which is not the case here.
—R. E. Tulloss and R. Lebeuf
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a single collection inadvertently contains a mixture of taxa.