Cortinarius clandestinus Kauffman 1932

Cortinarius clandestinus C. H. Kauffman, sp. no v
Pileus slightly fleshy, campanulate-convex, then plane, at first umbonate, at length depressed around the vanishing umbo, 3-6 cm. broad; surface dry, at first covered by dense, minute, clove-brown (R) fibrillose scales, the old-gold (R) ground color appearing later on the margin of the pileus and between scales, the disk at length darker; margin thin, at first incurved, then spreading and soon split, sometimes decorated at first by the olivaceous-yellowish, silky cortina; context thin, except the disk, rather fragile, yellowish-olivaceous, darker at first, the odor distinctly that of radish or sometimes slight ; lamellae adnate, then sinuate, usually rather narrow, close, at very first pallid, soon lutescent or with an olivaceous tinge, finally raw-sienna (R), the edge minutely white-flocculose ; stipe equal or slightly enlarged below, 6-10 cm. long, rarely longer, 5-10 (-12) mm. thick, stuffed, then hollow, obsoletely peronate by a light-greenyellow (R) universal veil, but usually merely fibrillose up to the obscure annular zone, or glabrescent, sublutescent within ; spores broadly ellipsoid to subglobose, rounded at the ends, smooth under high magnification, 6-7 X 5-6 /*, dark-rusty-brown under the microscope. (See page 348.)
Type collected among mosses, under Douglas fir and hemlock, Lake Cushman, Olympic Mountains, Washington, October 19, 1915, C. H. Kauffman (herb. Univ. Mich.). Distribution: New York, Colorado, and Washington.

Cortinarius clandestinus is a species of fungus in the Cortinariaceae family. It was first described in 1932 by Calvin Henry Kauffman from a specimen collected amongst moss under Douglas firs and hemlock at Lake Cushman, Washington. Kauffman states that it is found in the states of New York, Colorado and Washington.

The cap is golden brown and dry, with dark brown fibrillose scales. The flesh is yellowish (darker when fresh) and fairly fragile. It has an odour resembling radish. The gills are close and yellowish. The stem is equal or somewhat clavate, with yellowish veil fibrils and perhaps a ring demarcation.

The European species Cortinarius melanotus is similar, with a brownish veil on the stem. C. cotoneus is tougher, with lighter fibrils. C. venetus var. montanus is greenish, with a yellow veil when young and a tomentose cap.