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Nomenclature

Russula crustosa Peck
Rep. (Annual) New York State Mus. Nat. Hist. 39: 41-42. 1887.

Original diagnosis

Pileus at first convex, then nearly plane or centrally depressed, slightly viscid when moist, striate on the margin, brownish-yellow, greenish or subolivaceous, the cuticle cracking and forming small spot-like areolae or pseudo-verrucae; lamellae nearly entire, some of them forked at the base, narrowed behind and nearly free, white; stem cylindrical, stuffed or hollow, white; spores white, subglobose, .0003 to .00035 in. broad; flesh white, taste mild.
Pileus 3 to 5 in. broad, stem 1 to 2.5 in. long, 6 to 12 lines thick.
Rocky ground in thin woods. Day. July and Aug.
This plant approaches R. aeruginea so closely, that it may be a question whether it is a distinct species or a mere variety. It differs in the breaking up of the cuticle and in having the disk generally paler instead of darker than the rest of pileus. The cuticle usually remains entire on the disk, which is of a dingy yellowish hue, while toward the margin the color is greenish or smoky-green, though in some instances it also is yellowish or dirty straw-color. The greenish specimens so closely resemble R. virescens, that in a dry time they might easily be confused with that species. The viscid pileus and its striate margin will distinguish it. The lamellae are rather narrow anteriorly.

Typification

Holotypus: f913 (NYS)
North America: United States: New York: Day, Saratoga county
Rocky ground in thin woods

Description

Photographs

Microscopy

SEM photos