NATURAL HISTORY SURVEY 67 



On stumps of Hicoria ovata. Frequent. Soon destroyed by 

 insect larvae. The pileus is usually more or less irregular in 

 shape. 



Lentinus cochleatus Fr. 



Pileus flesh-color becoming pale, somewhat tan, fleshy-pliant, 

 thin, commonly eccentric, imbricated, very unequal, somewhat 

 lobed or contorted, sometimes plane, sometimes funnel-shaped- 

 umbilicate, but not pervious, smooth. 



Lamellae decurrent, crowded, serrated, white-flesh-color. 



Stem solid, firm, sometimes central, most frequently eccentric, 

 sometimes wholly lateral, always sulcate, smooth, flesh-colored 

 upward, reddish-brown downward. 



Pileus 5 to 7.5 cm. broad, stem 2.5 cm. or more long. 



On a dead stump, Lisle. August. Densely caespitose. 

 Margin of pileus strongly incurved; stems attenuated downward. 

 Spores white, globose, 4 ft. in diameter, with a single shining 

 nucleus. 



Lentinus lepideus Fr. 



Pileus pallid-ochraceous, variegated with darker, spot-like 

 scales, fleshy, veiy compact and firm, irregular, commonly ec- 

 centric, convexed then depressed but not umbilicate, sometimes 

 broken up into cracks, flesh pliant ; white. 



Lamellae decurrent but sinuate behind, crowded, broad, 

 transversely striate, whitish, the edge torn into teeth. 



Stem short, solid, stout, very irregularly formed, almost 

 woody, tomentose-scaly, whitish, rooted at the base, at first 

 furnished with a cortina at the apex. 



Pileus 5 to 10 cm. broad; -stem commonly 2.5 cm. long. 



On old sidewalks, bridge timbers, etc. Summer and autumn. 

 Frequent. Specimens found growing on pine (or hemlock?) 

 foundation timbers of a bridge near Gleri Ellyn, in June, 1900, 

 are referred with some doubt to this species. They vary in 

 having the lamellae deeply and unequally decurrent in the form 

 of interrupted lines or ridges, and have the entire surface of the 

 whitish stem broken up into darker squarrose scales. Spores 

 pure white, elliptic-oblong, 9 x 6 p.. 



Lentinus tigrinus Bull. (Plate VI, Fig. 2.) 



Pileus fleshy-coriaceous, thin, orbicular, umbilicate, whitish; 

 scales innate, hairy, blackish. * 



Lamellae adnate-decurrent, very narrow, white becoming 

 yellowish. 



Stem slender, not striate, scaly, the apex somewhat veiled. 



Pileus about 5 cm. broad; stem 2.5 to 5 cm. long. Spores 

 ellipsoid, 6.5 x 3.5 /x. 



On rotten stumps in wet woods, Glen Ellyn. June to October. 

 Some of our plants have perfect lamellae; others have them more 

 or less covered with the mycelium of some parasitic fungus. The 



