=C. butyra´cea= Bull.—_butyrum_, butter; buttery to the touch. =Pileus= 2–3 in. broad, normally _reddish-brown_, but becoming pale, fleshy, convex then expanded, more or less _umbonate_, dry, _even_, smooth. =Flesh= buttery, soft, somewhat hygrophanous, flesh-color then white. =Stem= 2–3 in. long, _attenuated_ upward from the thickened white downy base, hence much thinner at the apex, 2–3 lines only, but at the base ½-1 in. thick, externally covered over with a _rigid cartilaginous cuticle_, internally stuffed with soft _spongy pith_, or hollow only when old, _striate, reddish_, commonly smooth, but varying with white deciduous scales, and occasionally wholly downy with soft hairs. =Gills= slightly adnexed, _somewhat free_, thin, _crowded_, notched at the edge, white, _never spotted-reddish_. _Stevenson._ =Spores= 6–10×3–5µ _B._; elliptical, 7–9×4–5µ. =Cap= greasy looking. =Umbo= dark. The color of the cap is variable. The species differs from C. dryophila in having an umbonate pileus, slightly uneven gill-edges and stem which tapers upward. Solitary and in troops under coniferous trees. Spring, autumn. West Virginia, Chester county and Eagle’s Mere, Pa., _McIlvaine_. The caps cook quickly, are tender and have a good flavor. VESTI´PEDES. * _Gills broad, rather distant._ (Plate XXIX_b_.) [Illustration: COLLYBIA VELUTIPES. Natural size. ] =C. velu´tipes= Curt.—_velutum_, velvet; _pes_, a foot. =Pileus= 1–4 in. broad in the same cluster, _tawny_, sometimes paler at the margin, moderately fleshy at the disk, but thin at the circumference, convex then soon becoming plane, often eccentric, irregular and bent backward, smooth, _viscous_; margin spreading and at length slightly striate. =Flesh= watery, soft, slightly tawny-hyaline. =Stem= 1–3 in. long, 1–4 lines thick, tough, externally cartilaginous, _umber then becoming black, densely, minutely velvety_, commonly ascending or twisted, commonly equal, even, internally fibrous-stuffed and hollow. =Gills= broader and rounded behind, slightly adnexed, so as at first sight to appear free, _somewhat distant_, very unequal, _becoming pallid-yellow or tawny_. _Fr._ =Spores= ellipsoid, 7µ _W.G.S._; 6×4µ _B._; elliptical, 7×3–3.5µ _Massee_. Our American plant, common to the states, is rarely found attaining such dimensions. Its usual size is from 1–2 in. across, more frequently at 1–1¼. It is generally found in clusters more or less dense. The color varies from yellowish to a dark yellowish-brown. The center is darker than the margin. The cap viscid when moist, often irregular from crowding. Gills may be rounded or notched at their attachment to the stem, whitish or yellowish. Stem usually hollow, 1–4 in. long, 1–3 lines thick, whitish when young becoming colored with the dense brownish velvety hairs.