Lactarius _turpis_ Fries. Cap viscid, compact, _zoneless_, greenish umber, margin clothed with yellowish down; gills thin, paler than the cap; stem hollow or stuffed, stoutish, short, viscid, olive color, slightly attenuated towards the base; milk _white_, _acrid_. Fir woods. Lactarius _plumbeus_ Fries. Cap fleshy, firm, dry, somewhat hairy, varying in color, usually some shade of brown; gills yellowish, thin, and close together; stem solid, equal, lighter in color than the cap; flesh white; milk _white_ and _acrid_. Lactarius _vellereus_ Fries. _Fleecy Lactarius_. Cap compact, convex or umbilicate, zoneless, _minutely downy_; margin reflexed, gills white, _distant_, arcuate; stem short, solid, pubescent; milk _white_, _acrid_, somewhat scanty. In woods. Whole plant white. Lactarius _piperatus_ Scop. _Peppery Lactarius_. Cap fleshy, compact, convex and slightly umbilicate, at last deeply depressed, becoming funnel-formed, smooth and even; gills decurrent, very narrow, thin, even and close together, dichotonous, white; flesh white; milk _white_, _extremely acrid_, copious; stem very short, stout, solid. Whole plant white. Lactarius _blennius_ Fries. Cap depressed, slimy or glutinous, greenish-gray; margin incurved and somewhat downy. Gills narrow, white or whitish; stem stuffed or hollow, viscid, and of same color as the cap or paler; milk white and very acrid. M. C. Cooke divides the genus Lactarius into 4 "Tribes": (1) Piperites, in which the stem is central, gills _unchangeable_, naked, neither discolored nor _pruinose_, milk at first _white_ and _commonly acrid_; (2) Dapetes, in which the stem is central, gills naked, _milk from the first deeply colored_; (3) Russulares, in which the stem is central, gills pallid, _then discolored_, becoming darker, changing when turned to the light, at length _pruinose_, with milk at _first white_ and _mild_ and _sometimes becoming acrid_; (4) Pleuropos, in which the stem is concentric or lateral. To the first of these subdivisions, _Piperites_, belong all of the Lactars enumerated above. The Russians eat the Piperites only after the water of the first boiling has been taken off. Lactarius _rufus_ Scop., a very acrid species of large size, having reddish ochraceous gills and zoneless cap of reddish yellow with white milk, belongs to the subdivision Russulares. Common in fir woods. Dangerous. Lactarius _volemus_ Fries, a tawny yellow-capped mushroom with white gills changing to a yellowish hue, and copious _sweet_ white milk, belongs also to the latter subdivision. Edible.