42 THE AGARICACEAE OF MICHIGAN 



PILEUS 1U cm. broad, tough, sessile, sometimes couchate or 

 shelving, often resupinate when moist, sometimes subimbricate, per- 

 sistent, reviving when moist, irregularly incurved when dry, surface 

 tinged reddish-yellow with whitish hairs, becoming tan or buff- 

 brownish when dry, margin lobed. FLESH thin, fleshy-membrana- 

 ceous. GILLS very narrow, irregularly vein-like, interrupted or en- 

 tire, often forked, crisped, white or bluish-grey. SPORES cylin- 

 drical, smooth, 3-4 x 1-1.5 niicr., white. 



Scattered, gregarious, often closely crowded on limbs or bark 

 of frondose trees, especially beech, birch and cherry. Throughout 

 the state. Frequent. 



When dry the plants roll up irregularly and almost hide the gills. 

 the white color of which when fresh is rather sharply contrasted in 

 most cases with the color of the pileus. It has been placed in the 

 genus Plicatura by some authors. 



11. Trogia alni Pk. 

 N. Y. State Mns. Rep. 21, 1872 fas Plicatura alni). 



''PILEUS 1.5-2.5 cm. broad, coriaceous, resupinate-reflewed, gener- 

 ally imbricated, silky-tomentulose, brownish-tawny, the margin 

 sterile. GILLS narrow, irregular, interrupted wavy or crisped, 

 angular, white, becoming inconspicuous on drying.' - ' 



"On alder, etc." 



This species has not been reported in the state, but is included 

 for the sake of comparison. Some consider it identical with 

 Merulius niueus Fr., but that species is said to be pure white. 



Schizophyllum Fr. 



(From the Greek, schizo, to split and phyllon, a leaf, referring to 

 the split edge of the gills.) 



White-spored. Leathery-tough, arid, reviving in wet weather. 

 Gills split halfway from the edge inwards. Trama of pileus thin. 

 Veil none. 



Only one species is known in our region, but this is very common. 

 It grows on wood, on dead branches and trunks of standing trees 

 or more rarely on fallen limbs. The gills are very characteristic, 

 differing markedly from those of other genera by being split and the 

 halves recurved, and the structure of the two layers is continued 

 upwards almost through the pileus so that a thin pellicle covers 

 the surface. 



