170 Cincinnati Society of Natural History. 



tawny, when mature brownish-ferruginous, with a sterile border. Pores 

 medium, very long, subrotund and lacerate, cinnamon. 



In woods on trunks and branches ; common. The younger speci- 

 mens are tawny and the older brownish ; it is distinguished by its unequal 

 thickness and consequent interrupted and uneven surface. The pores are 

 commonly oblique and very long, measuring .21-24 ii^ii- in diameter. 



6%. P. CONTIGUUS, Pers. Effused, thick, firm, glabrous, submar- 

 ginate, cinnamon when young; the margin villous from the first. Pores 

 rather large, equal, obtuse, entire. 



A resupinate form growing commonly on the underside of dead and 

 dry stems of Papaw,(Asimina), is rather doubtfully referred to this species; 

 the same is found on the barkof Ailanthus. The pores are large .38 mm. 

 in diameter, angular, with thin dentate dissepiments. 



c. red or purplish. 



69. P. PURPUREUS, Fr. Widely and irregularly effused; mycelium 

 mucedinous, flocculose, white, creeping through the surface of the rotten 

 wood. Pores short, minute, unequal, scattered interruptedly or conglom- 

 erate, purple-lilac. 



On bark and wood of Sugar Maple; rare. Thin and delicate, occur- 

 ring in straggling patches, with groups of purple pores on the white myce- 

 lium. Some of the preserved specimens have bleached out white. It is 

 P. li/acinus, Schw. 



70. P. ATTENUATUS, Pcck. Effuscd, thin, even, coriaceous, seced- 

 ing, pinkish-ochre ; the border pubescent, whitish. Pores minute, subro- 

 tund, thin, acute. 



In woods on old trunks; not rare. Effused sometimes for many 

 inches. The minute pores are spread evenly over the very thin whitish 

 subiculum, which is separable from the matrix. The pores might, perhaps, 

 be called subangular as well as subrotund; they measure about .14 mm. in 

 diameter. This is a very beautiful species ; it may be P. viiidiis. Berk. 



71. P. RUFUS, Schrad. Effused, coriaceous, thin, adnate, even, 

 glabrous, determinate, dark red. Pores minute, thin, acute. 



On old prostrate trunks; common. Specimens which agree with it 

 quite well in color are doubtfully referred to this species; they appear 

 rather humid, and the substance consequently rather fleshy to come under 

 the designation coriaceous ; the pores too, when fresh, are obtuse, though 

 they may be called thin when dry. P. hcematodes, Rostk. is said to be the 

 same thing. 



