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Macroscopic description based on field notes of Buck McAdoo. The remainder of the following is based on original research of R. E. Tulloss.
50 - 95 mm wide, at first with sordid yellowish (sometimes slightly olivaceous) brown over disc and rather broad white zone at margin, in age largely sordid yellowish brown fading to tan-buff at margin, campanulate at first, then convex, concave in age, often with obtuse low umbo; context white, 10± mm thick above stipe; margin nonappendiculate, short striate (0.15-0.2R); universal veil absent or as small white fragment.
free, crowded, white, with edge entire; lamellulae truncate to excavate, sometimes with tooth extending along undersurface of pileus context.
130 - 180 × 14 - 21+ mm, white, narrowing upward, with appressed white pruinosity on uppermost portion, with fine flattened squamules below (becoming pallid brownish tan with age and handling); context white, hollow, with central cylinder up to 15 mm wide: exannulate: universal veil saccatae, submembranous, fragmenting, fragile, pale gray in upper part of limb, whitish below, with cottony exterior, with inner surface smooth, moist, pale gray.
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.
Combining more data into a single data set is non-optimal because it obscures observer differences
(which may be valuable for instructional purposes, for example) and may obscure instances in which
a single collection inadvertently contains a mixture of taxa.