From C.H. Kauffman’s description of Gomphidius in the United States:
Gomphidius oregonensis Peck (emended).
Pileus 5-10 cm. broad, at first convex, obtuse, becoming plane, glutinous from the universal veil, livid flesh-colored when fresh, becoming black-spotted in age and blackish when dried, glabrous, even; margin at first incurved. Gills short-decurrent, close to subdistant, gray when partly mature, then blackish. Stem 3-8 cm. long, subequal or tapering downwards, rather stout, 8-15 (25) mm. thick, floccose-fibrillose, citron-yellow almost to the apex, sheathed in part by the glutinous veil which sometimes terminates in a glutinous ring near the apex, yellow within at the base, surface becoming black-spotted when handled. Odor and taste mild. Spores narrow, elongated-ellipsoid, 10-13 × 3.5-4.5 µ, smooth, tinged smoky. Cystidia few, subcylindrical, 100-125 × 15-18 µ.
Description drawn from fresh plants collected at Lake Cushman, Washington, 1915, by C. H. Kauffman.
This has much the habit and stature of G. glutinosus, but is definitely distinct by its relatively small spores, and the somewhat different colors when fresh. The glutinous veil is quite thick on the pileus and especially so on the incurved margin of the young fruit-body. It is reported from all the Pacific coast states.