=M. parabo´lica= Fr.—shaped like a parabola. =Pileus= becoming black at the disk, inclining to violaceous, otherwise becoming pale, whitish, somewhat membranaceous, at first erect and oval, then parabolic, obtuse, never expanded, moist, somewhat shining when dry, smooth, even, striate toward the entire margin. =Stem= 2–3 in. long, 1 line thick, tubed, tense and straight but not very rigid, thickened and bearded-rooted at the base, pale below, dark violaceous above, when young white-mealy, otherwise even, smooth, dry. =Gills= simply adnate, ascending, somewhat distant, rarely connected by veins, quite entire, white, somewhat gray at the base. =Stem= less rigid than that of A. galericulatus. Truly gregarious or cespitose. _Fries._ =Spores= 12×6µ _B._; elliptical, 11–12×6µ _Massee_. Trenton, N.J. June. _E.B. Sterling_; West Virginia, New Jersey, Pennsylvania, on decaying stumps, trunks of oak, chestnut, poplar, pine. June until far into the winter. _McIlvaine._ =Plant= up to 2½ in. high. =Caps= usually about ½ in., but reaching ¾ in. A neat, attractive plant, whether single or in dense tufts. Its smell is strong of fresh meal, and taste of that delicate flavor one finds in the succulent base of the round, swamp rush, when pulled from its sheath—one that every country school boy and girl knows. It is pleasant raw, and delicious when cooked. =M. latifo´lia= Pk.—_latus_, broad; _folium_, a leaf. =Pileus= convex, rarely somewhat umbonate, striatulate, grayish-brown. =Gills= white, broad, hooked, decurrent-toothed. =Stem= slender, smooth, hollow, subconcolorous, white-villous at the base. =Height= 1–1.5 in., breadth of pileus 4–6 lines. =Stem= .5 lines thick. Under pine trees. Center. October. A small species with quite broad gills, growing among the fallen leaves of pine trees. Gregarious. _Peck_, 23d Rep. N.Y. State Bot. Mt. Gretna, Pa. Among pine needles, scattered, sometimes four or five in a cluster. September to October. _McIlvaine._ Autumnal. Not rare. The caps though small are tenacious in the mouth and lose little in cooking. The substance is agreeable and flavor fine. IV.— FRAGILI´PEDES. Stem fragile, juiceless, etc. None tested. V.—FILI´PEDES. Stem thread-like, etc. =M. collaria´ta= Fr.—_collare_, a collar. =Pileus= ½ in. and more broad, typically dingy-brown, but becoming pale, commonly gray-whitish, becoming brownish only at the disk, membranaceous, bell-shaped then _convex_, somewhat umbonate, striate, when dry rigid, smooth, _not soft nor slightly silky_. =Stem= about 2 in. long, tubed, _thread-like_ but almost 1 line thick, _tough_, dry, smooth, even or slightly striate under a lens, becoming pale. =Gills= adnate, _joined in a collar_ behind, thin, crowded, _hoary-whitish or obsoletely flesh-colored_.