NATURAL HISTORY SURVEY 45 



Mycena Leaiana Berk. 



Cespitose, viscid, bright orange. Pileus somewhat fleshy, 

 convex, the margin striate. 



Lamellae distant, broad, emarginate-attached, the edge a 

 darker orange or vermilion. 



Stem mostly curved, strigose at the base. 



Pileus about 2.5 cm. broad; stem 2.5 to 9 cm. long. The plant 

 is very viscid and stains the fingers that handle it. 



On rotten wood in woods, Glen Ellyn, River Forest and Glen- 

 coe. August and September. A showy species, wholly bright 

 orange-red, becoming paler with age. Spores short-oblong, 

 8 to 10 x 6 /x. 



Mycena corticola Schum. 



Pileus hemispherical or convex, subumbilicate, striate, brown 

 sometimes with a purple tint, and sometimes, having a grayish- 

 mealy appearance. 



Lamellae few, distant, subdecurrent, broadly attached to the 

 stipe. 



Stem short, curved, stuffed or hollow, concolorous with the 

 pileus. 



Pileus 4 to 6 mm. broad; stem about 12 mm. long. 



Gregarious on the bark of various living street and forest trees, 

 summer and autumn. Very common on Acer saccharinum L., 

 less common on A. saccharum and A. negundo. Pileus seldom 

 more than 5 cm. broad; stems subpellucid when moist. Spores 

 white, globose, 10 to 12 /n. When dry, the pileus closes about 

 the stem and becomes globose. In this condition the plants are 

 not easily discovered. The color of both pileus and stem of the 

 dry plants is grayish from the dense furfuraceous coating. 



OMPHALIA. 



Stem cartilaginous, fistulose, but having the tube often stuffed, 

 somewhat thickened upwards, widened out like a trumpet into the 

 pileus; pileus somewhat membranaceous; lamellae truly decurrent. 

 Plants terrestrial or epixylous. Spores white. 

 1. Lamellae venose-connected, yellowish 0. campanella. 



2. Lamellae distinct, white 3 



2. Lamellae distinct, gray 5 



3. Pileus even .' 4 



3. Pileus silky or flocculose 0. epichysia. 



4. Pileus white, diaphanous 0. stellata. 



4. Pileus whitish or brownish 0. rustica. 



Pileus pale-yellow to orange 0. fibula. 



Pileus white 0. scyphoides. 



Omphalia campanella Batsch. 



Pileus thin, convex, umbilicate, smooth, striatulate, hygroph- 

 anous, dull reddish-yellow. 



Lamellae narrow, arcuate, venose-connected, yellowish. 



