=Mycena vulgaris= Pers.--This common and pretty species is easily recognized by its smoky or grayish color, the umbilicate pileus and very slimy stem. It grows on decaying leaves, sticks, etc., in woods. It occurs in clusters. The plants are small, 3--5 cm. high, the cap 4--7 mm. broad, and the stem about 1.5 mm. in thickness. The =pileus= is thin, bell-shaped, then convex, and depressed at the center, with a papilla usually in the center, finely striate on the margin, and slightly viscid. The =gills= are white, thin, and finally decurrent, so that from the form of the cap and the decurrent gills the plant has much the appearance of an _Omphalia_. The =stem= is very viscid, grayish in color, often rooting at the base, and with white fibrils at the base, becoming hollow. Figure 99 is from plants collected in woods near Ithaca, during August, 1899. [Illustration: FIGURE 99.--Mycena vulgaris. Entirely white, center of cap grayish, entire plant very slimy when moist (natural size). Copyright.] =Mycena acicula= Schaeff.--This is one of the very small mycenas, and with the brilliant red pileus and yellow gills and stem it makes a very pretty object growing on leaves, twigs, or rotten wood in the forest. It occurs during summer and autumn. It is 2--5 cm. high, the cap 2--4 mm. broad, and the stem is thread-like. [Illustration: FIGURE 100.--Mycena acicula. Cap brilliant red, gills and stem yellowish (natural size). Copyright.] The =pileus= is very thin, membranaceous, bell-shaped, then convex, when the pointed apex appears as a small umbo. It is smooth, striate on the margin, and of a rich vermilion or orange color. The =gills= are rounded at the stem and adnexed, rather broad in the middle, distant, yellow, the edge white, or sometimes the gills are entirely white. The =stem= is very slender, with a root-like process entering the rotten wood, smooth except the hairs on the root-like process, yellow. Figure 100 is from plants (No. 2780, C. U. herbarium) collected in a woods near Ithaca. It has been found here several times. =Mycena cyanothrix= Atkinson.--This is a very pretty plant growing on rotting wood in clusters, often two or three joined at the base, the base of the stem inserted in the rotten wood for 1--2 cm., and the base is clothed with blue, hair-like threads. The plants are 6--9 cm. high, the cap 1--2 cm. broad, and the stem not quite 2 mm. in diameter.