This fungus was placed by Fries among the Pleuroti, and in this he has been followed by most authors. But the spores have a delicate pink color closely resembling that of the young lamellæ of the common mushroom, Agaricus campestris. We have, therefore, placed it among the Claudopodes, where Fries himself has suggested it should be placed if removed at all from Pleurotus. Our plant has sometimes been referred to Panus dorsalis Bosc., but with the description of that species it does not well agree. The tawny-color, spoon-shaped pileus, pale floccose scales, short lateral stem and decurrent lamellæ ascribed to that species are not well shown by our plant. The substance of the pileus, though rather tenacious and persistent, can scarcely be called leathery. The flesh is white or pale yellow. The hairy down of the pileus is often matted in small tufts and intermingled with coarse hairs, especially toward the margin. This gives a scaly or pointed-hairy appearance. The color of the pileus is often paler toward the base than it is on the margin. _Peck_, 39th Rep. N.Y. State Bot. Mt. Gretna, Pa., November, 1898, decaying stumps. _McIlvaine._ An autumnal species growing upon wood. Not common. The light yellow tomentosity of the cap arranges itself into shapes as fascinating as crystals of snow. Taste pleasant, mild. Texture more solid than P. ostreatus, consequently tougher. It is edible but not desirable. Must be chopped fine and cooked well. [Illustration: Grouped by F.D. Briscoe—Studies by C. McIlvaine. PLATE LXXI.] FIG. PAGE. FIG. PAGE. 1. HEBELOMA GLUTINOSUM, 283 3. PHOLIOTA SQUARROSA, 273 2. PHOLIOTA CAPERATA, 270 4. PHOLIOTA SUBSQUARROSA, 275 _Hymenophore distinct from fleshy stem._ ACETABULARIA. BOLBITIUS. _Hymenophore confluent and homogenous with fleshy stem._ CORTINARIUS. PHOLIOTA. INOCYBE. HEBELOMA. FLAMMULA. PAXILLUS. CREPIDOTUS. _Hymenophore confluent with, but heterogeneous from cartilaginous stem._ NAUCORIA. GALERA. PLUTEOLUS. TUBARIA. _Series III._ =OCHRO´SPORÆ= (Dermini). Spores brown. Ochrosporæ, third in color series, ranges in spore color from dull ochraceous, through bright ocher, to rusty orange and ferruginous or iron-rust. The various shades will tax even a color expert.