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Nomenclature

Russula disparilis Burl.
Mycologia 10 (2): 94. 1918 (as 'disparalis').

Original diagnosis

Russula disparalis sp. nov.

Pileus broadly convex, becoming expanded and depressed in the center, up to 5.5 cm. broad; surface buff-yellow near the margin, Apricot-yellow toward the center, Sandford's brown to Auburn or Hessian-brown on the disk, viscid when wet, with separable pellicle, pruinose, otherwise glabrous; margin striate and obsoletely tuberculate, inrolled until mature; context white, taste sulbacrid, odor not distinctive; lamellae white, mostly equal but a few not long enough to reach to the stipe, adnexed and rounded next the stipe, rather broad, subcrowded; stipe white, equal, spongy, becoming hollow, glabrous, rugose, subflexuose to straight, up to 5.5 cm. long and 1.5 cm. in diameter; spores ochroleucous, broadly ellipsoid, uniguttulate, apiculate, minutely echinulate, 8.7–10 × 6–7.5 µ, from 1.5 to 1.8 µ being taken up by the point at the apex of the spore.

Typification

Holotypus: -
North America: United States: Massachusetts: Stow
Under chestnut trees in damp ground near a swamp. Also under Pteris aquilina, Osmunda cinnamomea, Osmunda regalis, black and white birch, and alder.

Description

Photographs

Microscopy

SEM photos