=L. glycios´mus= Fr. _Gr_—sweet; _Gr_—scent. =Pileus= ½-1½ in. broad, thin, convex nearly plane or depressed, often with a small umbo or papilla, _minutely squamulose_, ash-colored, grayish-brown or smoky-brown, sometimes tinged with pink, the margin even or slightly and distinctly striate. =Gills= narrow, close, adnate or decurrent, whitish or yellowish. =Stem= ½-1½ in. long, 1–3 lines thick, equal, glabrous or obsoletely pubescent, stuffed, rarely hollow, whitish or colored like the pileus. =Milk= white, taste acrid and unpleasant, sometimes bitterish, odor _aromatic_. _Peck_, 38th Rep. N.Y. State Bot. Smell agreeable, of melilot, as that of L. camphoratus. =Spores= spheroid, echinulate, 6–8µ _K._; subglobose, size variable, 6–10µ _Massee_. The American plant, so far as observed, does not have the red hues ascribed to the European. Haddonfield, N.J., _T.J. Collins_; Scranton, Pa., _Dr. J.M. Phillips_; Chester county, Pa., September, 1887, on ground in woods, _McIlvaine_. This small Lactarius was found on several occasions. Its odor is attractive, but its taste is not. Cooked it is of high flavor, but will not be liked by many. =L. aqui´fluus= Pk.—watery. =Pileus= fragile, fleshy, convex or expanded, at length centrally depressed, dry, smooth, or sometimes appearing as if clothed with a minute appressed tomentum, reddish tan-colored, the decurved margin often flexuous. =Gills= rather narrow, close, whitish, becoming dull reddish yellow. =Stem= more or less elongated, equal or slightly tapering upward, colored like the pileus, smooth, hollow, the cavity irregular as if eroded. =Spores= subglobose, rough, 7.6µ. =Flesh= colored like the pileus. =Milk= sparse, watery. =Plant= 3–8 in. high. =Pileus= 3–6 in. broad. =Stem= 5–10 lines thick. Swamps and wet mossy places in woods. Sandlake and North Elba. August and September. The relationship of this plant is with L. serifluus, to which it was formerly referred, but from which I am now satisfied it is distinct. The hollow stem is a constant character in our plant, and affords a ready mark of distinction. The plant, though large, is very fragile, and breaks easily. The taste is mild or but slightly acrid. Sometimes there is an obscure zonation on the pileus, which, in large specimens, is apt to be irregular and much worm-eaten. The milk looks like little drops of water when first issuing from a wound, but it becomes a little less clear on exposure to the atmosphere. The decided but agreeable odor of the dried specimens persists a long time. _Peck_, 28th Rep.