This is a large, fine species, very distinct by its cespitose habit, white color and very pale sordid-tinted spores. But for the color of these the plant might easily be taken for a species of Clitocybe. The tufts sometimes form long rows. _Peck_, 42d Rep. N.Y. State Bot. Mt. Gretna, Pa. October. _McIlvaine._ Tender, not much flavor. =C. Noveboracen´sis= Pk.—New York Clitopilus. =Pileus= thin, convex, then expanded or slightly depressed, dingy white, _cracked in areas or concentrically rivulose_, sometimes obscurely zonate, odor farinaceous, _taste bitter_. =Gills= narrow, close, deeply decurrent, some of them forked, white, becoming dingy, tinged with yellow or flesh-color. =Stem= equal, solid, colored like the pileus, the mycelium white, often forming white branching root-like fibers. =Spores= globose, 4–5µ broad. Var. _brevis_. Margin of the pileus, in the moist plant, pure white. =Gills= adnate or slightly decurrent. =Stem= short. =Pileus= 1–2 in. broad. =Stem= 1–2 in. long, 1–3 lines thick. Woods and pastures. Adirondack mountains, Albany and Rensselaer counties. August to October. The plant is gregarious or cespitose. Sometimes, especially in the variety, it grows in lines or arcs of circles. The margin is often undulated, and in the variety it is, when fresh and moist, clothed with a film of interwoven webby white fibrils which give it a peculiar appearance, and if the spore characters are neglected it might be mistaken for Clitocybe phyllophila. The disk is often tinged with reddish-yellow or rusty hues when moist, and its rivulose character is then more distinct. A farinaceous odor is generally present, especially in the broken or bruised plant, but its taste is bitter and unpleasant. Sometimes bruises of the fresh plant manifest a tendency to assume a smoky-brown or blackish color. The base of the stem is sometimes clothed with a white mycelioid tomentum. _Peck_, 42d Rep. N.Y. State Bot. =C. Sey´mourianus= Pk.—=Pileus= fleshy, thin, broadly convex or slightly depressed, even, _pruinose, whitish with a dark lilac tinge_, sometimes lobed and eccentric. =Gills= narrow, crowded, decurrent, some of them forked at the base, whitish with a pale flesh-colored tint. =Stem= equal, silky-fibrillose, _hollow_. =Spores= minute, globose or nearly so, 3.5–4µ long. =Pileus= 1–2.5 in. broad. =Stem= 1.5–2.5 in. long, 3–4 lines thick. Woods. Lewis county. September. _Peck_, 42d Rep. N.Y. State Bot. =LEPTO´NIA= Fr. _Gr_—slender. (Plate LXVI.) [Illustration: LEPTONIA.] Rosy-spored. =Stem= _cartilaginous_, tubular (the tube stuffed or hollow), polished, somewhat shining. =Pileus= _thin_, umbilicate or with a darker disk, cuticle fibrillose or separating into darker scales, _margin at first incurved_. =Gills= at first adnexed or adnate but readily separating. _Fries._