The pileus is dark-gray to hair-brown or olive-brown, often subvirgate with darker lines; gills light salmon-color, becoming dull; stem colored as the pileus, but paler; in drying the stems usually become as dark as the pileus.
Pileus subviscid when moist, convex to expanded, plane or subgibbous, not umbonate, irregular, repand, margin incurved; flesh white, rather thin, very thin toward the margin.
Gills are broad, 1–1.5 cm. broad, narrowed toward the margin of the pileus, deeply sinuate, the angles usually rounded, adnexed, easily becoming free, edge usually pale, sometimes connected by veins, sometimes costate, especially toward the margin of the pileus.
Basidia four-spored. Spores subglobose, about six angles, 8–10µ in diameter, some slightly longer in the direction of the apiculus, pale-rose under the microscope.
Stem even, fibrous striate, outer bark subcartilaginous, flesh white, stuffed, becoming fistulose.
Odor somewhat of old meal and nutty, not pleasant; taste similar.
Related to E. prunuloides, Fr., and E. clypeatum, Linn. Differs from the former in dark stem and uneven pileus, differs from the latter in being subviscid, with even stem, and pileus not umbonate and much more irregular, and differs from both in subcostate gills. Atkinson.
The specimens in Plate XXX grew in grassy ground on the campus of the Ohio State University, Columbus, Ohio. They were collected by R. A. Young and photographed by Dr. W. A. Kellerman, and through his courtesy I publish it. The plants were found the last of October, 1906.