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—R. E. Tulloss
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The following material is based on original research by R. E. Tulloss and Linas Kudzma.
up to 80± mm wide, white, unchanging, campanulate at first, later convex with slight umbo, shiny, tacky; context white, not changing when cut or bruised, 8± mm thick above stipe, thinning to membrane for last 10± before margin; margin nonappendiculate, striate (0.4 - 0.45R); universal veil absent or as large yellowish buff membranous patch.
free without decurrent line on uppermost stipe, crowded, pinkish in mass, cream in side view, unchanging when cut or bruised, up to 6± mm broad; lamellulae truncate, scattered, with 3 - 5+ lamellae between closest pairs of lamellulae.
195 - 200 × 20± mm, probably whitish (obscured by mud in single collection), narrowing upward, flaring slightly at apex; context whitish, watersoaked, with yellow-brown staining, dominantly hollow, otherwise stuffed with material suggesting very wet cotton, with central cylinder 14 mm wide; exannulate; universal veil as saccate volva, whitish, thick, fragile, submembranous, breaking up in substrate, up to 35+ × 25 mm.
bilateral, convergent; wcs = 35 - 40 μm; central stratum including subfusiform inflated elements; subhymenial base including clavate cells (e.g., 27 - 35 × 12.5 - 14 μm), t.b.d.
wst-near = 35 - 40 μm (moderately to relatively well rehydrated); wst-far = 50 - 55 μm (moderately to relatively well rehydrated); mostly composed of uninflated short hyphal segments, t.b.d..
[20/1/1] (8.0-) 8.5 - 11.0 (-11.2) × (6.8-) 7.0 - 9.8 μm, (L = 10.0 μm; W = 8.0 μm; Q = (1.05-) 1.06 - 1.24 (-1.25); Q = 1.13), hyaline, colorless, smooth, thin-walled, inamyloid, sublgobose to broadly ellipsoid, adaxially flattened; apiculus sublateral, cylindric to narrowly truncate-conic; contents multiguttulate; color in deposit not recorded.
Minnesota: In dark soil of old lake bottom, in sparsely wooded region of Populus ("Aspen") and Juniperus on west-facing slope with much Rhamnus cathartica (invasive alien).
U.S.A.: MINNESOTA—Washington Co. - Afton, 11.vii.1993 Anna Gerenday 9307 (nonconformant paratype of A. populiphila, RET 096-5, nrITS & nrLSU seq'd.).
Gerenday 9307 was a paratype of A. populiphila; however, it proved non-conformant when it was evaluated genetically. Its spores were among the smallest attributed to any paratype collection of A. populiphila; hence, spore size may prove to be a differentiating morphological character:
It may also be separated from populiphila by its reportedly unstaining pileus.
—R. E. Tulloss, Linas Kudzma. and Anna Gerenday
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Spore data for collections provisionally identified as: Amanita sp-MN03
Each spore data set is intended to comprise a set of measurements from a single specimen made by a single observer;
and explanations prepared for this site talk about specimen-observer pairs associated with each data set.
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a single collection inadvertently contains a mixture of taxa.