=H. mus´sivum= Fr.—_mussivus_, undecided. (Uncertain in generic place.) =Pileus= 2–4 in. broad, either of one color, yellow or darker at the disk which is like a smooth sugar-cake, fleshy, _compact_, firm, convex then plane, unequal, very obtuse, viscid, at first _smooth_ and even, margin bent inward, even, then commonly turning upward and broken up into scales. =Flesh= thick, becoming yellow. =Stem= 4 in. long, commonly 1 in. thick, _very fleshy_, sometimes stuffed, sometimes hollow at the top, equal or broad in the middle, _wholly fibrillose and powdered at the top, light yellow_. =Veil= fibrillose, very evanescent. =Gills= emarginate, somewhat crowded, 3 lines broad, dry (not distilling drops), _at first light yellow_, then together with the spores somewhat rust-colored. Odor weak, not unpleasant. Very distinct. It departs widely from all the following species in its habit and bright colors. The habit is that of a Flammula or Cortinarius, but the gills are emarginate and not powdered; from the turned up pileus and from the stem being powdered at the top, and from other marks it is to be referred to Hebeloma. _Fries._ =Spores= elliptical, 12×6µ _Massee_. New Jersey, Haddonfield. Under pine trees. Solitary. Frequent. September, 1896. _McIlvaine._ Not previously reported. Taste, even raw, is pleasant. It is meaty and the meat is good. It requires slow cooking and is best chopped fine and served in patties or croquettes. (Plate LXXVI_a_.) [Illustration: HEBELOMA FASTIBILE. One-fourth natural size. ] =H. fasti´bile= Fr.—_fastidibilis_, loathsome. From the smell. =Pileus= 2 in. and more broad, pale yellowish, tan or becoming pale, compactly fleshy, convexo-plane, obtuse, somewhat wavy, even, smooth, the turned-in margin downy. =Stem= 2–3 in. long, ½ in. thick, _solid_, wholly fleshy-fibrous, stout, somewhat bulbous, often twisted, everywhere _white-silky and fibrillose_, white, but varying pallid, white-scaly upward. =Cortina= remarkable, white, occasionally in the form of a ring. =Gills= remarkably _emarginate, somewhat distant_, rather broad, at first becoming pale-white, then dingy clay-color, edge whitish, _distilling drops_ in rainy weather. Somewhat cespitose. Odor and taste of radish, bitterish. Like A. crustiliniformis; the odor is the same except that it is stronger, but it differs conspicuously _in the manifest veil and somewhat distant gills_. Var. _al´ba_, stem longer, equal, somewhat hollow, fibrous-scaly at the apex, gills distant. A. spiloleucus Krombh., A. sulcatus Lindgr. is an elegant form with the margin of the pileus sulcate or rugoso-plicate. In mixed woods. Common. July to October. _Stevenson._ =Spores= 11×8µ _W.G.S._; elliptical, pointed, 10×8µ _Morgan_. Var. _elegans_. Pileus purple-brown. This sometimes appears on disused mushroom beds in large quantities, but the method by which the spores gain access is involved in darkness.