=C. esculen´ta= Wulf.—_esculent._ =Pileus= ½ in. and more broad, _ochraceous-clay_, often becoming dusky, _slightly fleshy_, convex then plane, orbicular, _obtuse_, smooth, even or when old slightly striate. =Flesh= tough, white, savory. =Stem= 1 in. and more long, scarcely 1 line thick, or thread-like and wholly equal, _obsoletely tubed_, tough, _stiff and straight_, even, smooth, slightly shining, _clay-yellow_, with a _long perpendicular_, commonly _smooth_, tail-like _root_. =Gills= adnexed, even decurrent with a very thin small tooth, then separating, _very broad_, limber, _somewhat distant, whitish,_ sometimes clay-color. Gregarious but never cespitose. The tube of the stem is very narrow. _Stevenson._ The smallest edible Collybia. _Cooke._ Edible. In dense woods. _Curtis._ It is dried and preserved. _Cordier._ In pastures and grassy places. Spring and early summer. Edible, but rather bitter flavor. In Austria, where it is in great plenty in April, large baskets are brought to market under the name of Nagelschwämme—nail mushrooms. Professor Peck describes C. esculentoides Pk., 49th Rep. N.Y. State Bot., which he states: “Differs from the type in its paler and more ochraceous color and in its farinaceous flavor, and is related to the European C. esculenta from which it differs essentially in the umbilicate pileus and in the absence of any radicating base to the stem.” ** _Gills narrow, crowded._ =C. dryophil´a= Bull. _Gr._—oak-loving. (Plate XXVIII, fig. 3, p. 112.) =Pileus= 1–3 in. across, bay-brown-rufous, etc., _becoming pale_, but not hygrophanous, slightly fleshy, tough, convexo-plane, _obtuse, commonly depressed in the center_, even, smooth; margin at first inflexed then flattened. =Flesh= thin, white. =Stem= 1–3 in. long, 1–3 lines thick, cartilaginous, _remarkably tubed_, thin, even, smooth, somewhat rooting, commonly _becoming yellow or reddish_. =Gills= _somewhat free_, with a small decurrent tooth, but appearing adnexed when the pileus is depressed, _crowded, narrow_, distinct, plane, _white_ or becoming pale. There are numerous monstrous forms which are very deceiving: _a._ =Stem= elongated, waved, decumbent, inflated at the base; =pileus= broader, _lobed_; =gills= white. _b._ _Funicularis_, larger, cespitose, the lax and decumbent =stem= equal and hairy at the base, =gills= sulphur-yellow. These forms, analagous with A. repens Bull., occur on heaps of leaves. _c._ Countless specimens growing together in a large cluster; =stems= thick, inflated, irregularly shaped, _sulcate_, brown, the mycelium collecting the soil in the form of a ball; =pileus= very irregularly shaped, full of angles, undulated, blackish then bay-brown. In gardens. _Stevenson._ =Spores= elliptic-fusiform, 7–8×4µ; 6µ _W.G.S._