28 



A KEY TO THE STIPITATE POLYPORACEAE OF 

 TEMPERATE NORTH AMERICA — I 



By William A. Murrill 



Key to the Genera 



Surface of liymenophore covered with reddish-brown varnish. A. Ganoderma 



Surface of hynienophore not as above. 



Tubes hexagonal and radially elongated. B. Hexagona 



Tubes not as above. 



Stipe compound. C. Grikola 



Stipe simple. 



Context white. 



Plants fleshy, terrestrial. D. Scutiger 



Plants tough, epi.\ylous. 



Pileus inverted, erumpent from lenticels. 



E. PORODISCUS 



F. PuLYl'ORUS 



Pileus erect, not erumpent. 



Context homogeneous, firm. 



Context duplex, spongy above, woody below. 



G. Abortii'Orus 

 Context brown. 



Hymenium concentrically lamelloid. H, Cyclopijrus 



Hymenium poroid. 



Spores white. I, Ro.MELLlA 



Spores brown. 



Pileus erect, stipe central. J. Coltricia 



Pileus inverted, pendent. K. Coltricieli.a 



A. The Stiimtate Stecies ok Ganoderma 

 I. Context ochraceous to fulvous ; plant perennial on deciduous trees. 



G. Jlabt'lliforme (Scop.) Murrill 

 Context pallid ; plant annual on hemlock. G. Tmgae Murrill 



B. The Stititate Species of He.kagon.v 

 Surface glabrous to fibrillose, not distinctly hispid. 2 



Surface hispid ; tubes small ; context thin, translucent. //. floriJana Murrill 



Pileus reniform at maturity ; stipe usually much reduced. 3 



Pileus flabclliform ; stipe usually very distinct, equaling (he pileus at times in 

 length; tubes of medium size. //. daeiialea (Link) Murrill 



Tubes large ; surface of pileus decorated with imiiricated reddish-brown fibrils, 

 which disappear with age. //. alveola) is (DC.) Murrill 



Tubes much smaller, the mouths rarely over i mm. long and 0.5 mm. broad ; sur- 

 face of pileus glabrous. II. viiciopora VixxrrW 



