The =pileus= is thin, conic, bell-shaped to convex and nearly expanded, sometimes with a small umbo, smooth, and finely striate on the margin, in age the striæ sometimes rugulose from the upturning of the margin. Sometimes the pileus is rugose on the center. The =gills= vary from white to violet, rose, etc., they are adnate to sinuate, and in age sometimes become free by breaking away from the stem. They are broad in the middle, connected by vein-like elevations over the surface, and sometimes wavy and crenate on the edge, the edge of the gills sometimes white. The =spores= are white, oblong, 2.5--3.5 × 6--7 µ, smooth. The =basidia= are cylindrical, 20--25 × 3--4 µ, four-spored. There are a few =cystidia= in the hymenium, colorless, thin walled, clavate, the portion above the hymenium cylindrical, and 30--40 × 10--12 µ. The =stem= is sometimes white when young, but later becomes of the same color as the pileus, often a lighter shade above. It is straight, or ascending, cylindrical, even, smooth, hollow, with a few white threads at the base. Sometimes on drying the pileus becomes deeper in color than when fresh. The gills also become deeper in color in drying, though the edge remains white if white when fresh. Figure 97 is from plants (No. 3946, C. U. herbarium) collected at Blowing Rock, N. C., in August, 1899. The plants are often considerably larger than shown in the figure. [Illustration: FIGURE 98.--Mycena epipterygia. Cap viscid, grayish, often tinged with yellowish or reddish in age, gills white, sometimes tinged with blue or red, stem yellowish, or same color as cap (natural size). Copyright.] =Mycena epipterygia= Scop.--This pretty little species is quite readily distinguished by the gray, conic or bell-shaped cap, the long, hollow, slender stem, and the viscid pellicle or skin which is quite easily peeled off from the stem or cap when moist. It grows in woods or grassy places, or among moss, etc., on the ground or on very rotten wood. The plants are from 5--10 cm. high, the cap 1--2 cm. broad, and the stem about 2 mm. in thickness. It is widely distributed in Europe, America, and other North temperate countries. The =pileus= is viscid when moist, ovate to conic or campanulate, and later more or less expanded, obtuse, the margin striate, and sometimes minutely toothed. The usual color is grayish, but in age it often becomes reddish. The =gills= are decurrent by a small tooth, and quite variable in color, whitish, then gray, or tinged with blue or red. The =stem= is very slender, flexuous, or straight, fistulose, tough, with soft hairs at the base, usually yellowish, sometimes the same color as the cap, and viscid like the cap when moist. Figure 98 is from plants (No. 4547, C. U. herbarium) collected at Ithaca in August, 1899.