It is a large fine fungus, easily known by its white and yellowish hues, its crowded gills, viscid stem and peculiar penetrating almost alkaline odor. The cuticle of the pileus is thin and soft to the touch, but it sometimes cracks longitudinally and is sometimes slightly adorned with innate fibrils. A. dehiscens is said to have a viscid stem, but it is also squamose and the pileus is yellowish-ochraceous. _Peck_, 44th Rep N.Y. State Bot. Quite common in Pennsylvania and New Jersey. _McIlvaine._ It loses its strong odor when cooked and is equal to other Armillaria in edibility. Unless well cooked it has a slight saponaceous flavor. This is easily overcome by a few drops of lemon juice or sherry. =A. appendicula´ta= Pk.—bearing an appendicula or small appendage. =Pileus= broadly convex, glabrous, whitish, often tinged with rust color or brownish rust color on the disk. =Flesh= white or whitish. =Gills= close, rounded behind, whitish. =Stem= equal or slightly tapering upward, solid, bulbous, whitish, the veil either membranous or webby, white, commonly adhering in fragments to the margin of the pileus. =Spores= subelliptical, 8×5µ. =Pileus= 2–4 in. broad. =Stem= 1.5–3.5 in. long; 5–10 lines thick. Auburn, Ala. October. _C.F. Baker._ The general appearance of this species is suggestive of Tricholoma album, but the presence of a veil separates it from that fungus and places it in the genus Armillaria. The veil, however, is often slightly lacerated or webby and adherent to the margin of the pileus. _Peck_, Bull. Torrey Bot. Club, Vol. 24. Mt. Gretna, Pa., Angora, Pa. On decaying roots in ground. August to November. Found plentifully in resorts of other Armillaria. Edibility the same. _McIlvaine._ =A. pondero´sa= Pk.—_ponderosus_, weighty, ponderous. =Pileus= thick, compact, convex or subcampanulate, smooth, white or yellowish, the naked margin strongly involute beneath the slightly viscid, persistent veil. =Gills= crowded, narrow, slightly emarginate, white inclining to cream color. =Stem= stout, subequal, firm, solid, coated by the veil, colored like the pileus, white and furfuraceous above the ring. =Flesh= white. =Spores= nearly globose, 4µ in diameter. =Plant= 4–6 in. high. =Pileus= 4–6 in. broad. =Stem= about 1 in. thick. Ground in woods. Copake, Columbia county. October. The veil for a long time conceals the gills, and finally becomes lacerated and adheres in shreds or fragments to the stem and margin of the pileus. _Peck_, 26th Rep. N.Y. State Bot. New England, _Frost_; New York, _Peck_, Repts. 26, 29, 41. West Virginia and Pennsylvania. Ground in woods. September to November. _McIlvaine._ Professor Peck says in 26th Report: “This species has not been found since its discovery in 1872.” Where the Armillaria mellea frequents I have often found A. ponderosa. It was plentiful at Mt. Gretna, Pa., in September, 1898. Young specimens are quite as edible as A. mellea, and rather more juicy.