=H. chloroph´anus= Fr. _Gr_—greenish-yellow. =Pileus= 1 in. broad, commonly bright sulphur-yellow, sometimes, however, scarlet, not changing color, somewhat membranaceous, very fragile, at first convex, then plane, obtuse, orbicular and lobed, and at length cracked, smooth, viscid, striate. =Stem= 2–3 in. long, 2–3 lines thick, hollow, equal, round, rarely compressed, wholly even, smooth, viscid when moist, shining when dry, wholly unicolorous, rich light yellow. =Gills= emarginato-adnexed, very ventricose, with a thin decurrent tooth, thin, distant, distinct. _Fries._ Very much allied to H. conicus, but never becoming black, and otherwise certainly distinguished by its convex, obtuse, striate pileus, by its even and viscous stem, and by its emarginato-free, thin, somewhat distant, whiter gills. Like H. ceraceus in appearance. In grassy and mossy places. Common. August to October. _Stevenson._ =Spores= 8×5µ _Cooke_; 8µ _Q._ Received from E.B. Sterling, Trenton, N.J., August, 1897. Open grassy woods. But three specimens were tested. They were in every way agreeable. [Illustration: Grouped by F.D. Briscoe—Studies by C. McIlvaine. PLATE XLI.] FIG. PAGE. FIG. PAGE. 1. LACTARIUS PIPERATUS, 168 3. LACTARIUS DELICIOSUS, 170 2. LACTARIUS INDIGO, 171 4. LACTARIUS VOLEMUS, 180 LACTA´RIUS Fr. Giving _lac_ (milk). The hymenophore continuous with the stem. =Pileus= somewhat rigid, fleshy, becoming more or less depressed, often marked with concentric zones. =Gills= unequal, membranaceous-waxy, slightly rigid, milky, edge acute, decurrent or adnate and often branched. =Stem= stout, central, rarely excentric except in those growing on trunks. =Spores= globose, minutely echinulate, white, rarely yellowish. Nearly all grow on the ground. Distinguished from all other fungi by the presence of a granular milk which pervades every part of the plant and especially the gills; it is commonly white, sometimes changing color and in section Dapetes highly colored from the first. The nature of the milk, especially its taste, whether acrid, subacrid or mild, must be carefully noted in distinguishing species, as it is the most useful characteristic. In Russula, the only allied genus, the milk-bearing cells are present, but their contents do not appear as milk.