The Mycologic Flora of the Miami Valley, Ohio. 108 



convex, subzonate, pubescent, white within and without ; the 

 margin acute, at length yellowish. Pores short, minute, nearly 

 round and plane. 



On stumps and old trunks; not common. Pileus r^ inches or 

 more in breadth, usually much imbricated and laterally confluent. 

 My specimens differ in color from the type, being rather brownish, 

 especially on the margin ; they may be the P. Sullivantii, Mont., 

 which Prof. Peck considers as not specifically distinct. 



B. PLACODERMEL Pileus covered with a contiguous crust, 

 azonate or concentrically sulcate ; persistent. 



IV. SuBEROSi. Pileus at first somewhat fleshy and juicy, after- 

 ward hardened, covered by a rather thin crust; autumnal and some- 

 what persistent. 



38. P. dryophihis, Berk. Pileus large, thick, ungulate, fleshy, 

 then corky, uneven, scabrous, ferruginous-yellow, canescent. Pores 

 small, irregular, angular, entire, ferruginous, the mouth whitish. 



Growing at the base of living oak trees, and also on oak logs. 

 Pileus 3 — 5 inches in breadth, i ^ — 2 inches thick. The pileus is 

 commonly very irregular and unequal, the surface uneven, with ele- 

 vations and depressions; the ferruginous color prevails throughout, 

 whitened externally by a subtle canescence or glaucescence. It is 

 rather corky from the first, becoming hard and brittle. 



39. P. resinosus, Schrad. Pileus fleshy, then corky, flocculose- 

 pruinate, reddish brown; the cuticle adnate, rigid, rivulose, resin- 

 aceous ; within azonate, pallid. Pores minute, equal, pallid. 



On old trunks in autumn ; very common. Pileus usually 4 — 7 

 inches in breadth, though specimens a foot in diameter are met 

 with ; often imbricate and sometimes zonate. 



V. FoMENTARii. Pileus dry, covered with a hard, horny crust ; 

 perennial, yearly adding new strata, 



a. Context Colored. 



40. P. reniformis, Morg. Pileus sessile or substipitate, reniform 

 or dimidiate, ascending, concave above and convex below; the sur- 

 face ferruginous, concentrically sulcate and subzonate; the margin 

 thin and acute. Pores minute, ferruginous, the mouth whitish. 



Growing about the base of old stumps ; common. Pileus 3 — 6 



