MURRILL : PoLVPORACEAE OF NORTH AMERICA 427 



A brief synopsis of Hie jtenera treated in articles I-VIII of this 



series 



Surface of hymenophore covered with reddish-brown varnish, context corky. 



Ganoderma. 



Surface of hymenophore not as above, or, if so, context woody. 

 Hymenophore annual. 



Tubes hexagonal and radially elongated. Hexagona. 



Tubes not as above. 



Hymenophore stipitate. 



Stipe compound. Grifola. 



Stipe simple. 



Context white. 



Plants fleshy, terrestrial. Scutiger. 



Plants tough, epixylous. 



Pileus inverted, erumpent from lenticels. Porodiscus. 

 Pileus erect, not erumpent. 



Context homogeneous, firm. Polyporus 



Context duplex, spongy above, woody below. 



Abortiporus. 

 Context brown. 



Hymenium concentrically lamelloid. Cycloporus. 



Hymenium poroid. 



Spores white. Romellia. 



Spores brown. 



Pileus erect, stipe central. Coltricia. 



Pileus inverted, pendent. Coltriciella. 



Hymenophore sessile. 

 Context white. 



Tubes at length separating from the context, surface smooth. 



Piptoporus. 

 Tubes not separating from the context, surface zonate. 



Poronidulus. 

 Context red. Pycnoporus. 



Context brown. 



Spores white. Hapalopiha. 



Spores brown. Cydomycetella. 



Hymenophore perennial. 



Context and tubes white or pallid. 



Hymenium at first concealed by a volva. Cryptoporus. 



Hymenium free from the first. Pomes. 



Context and tubes brown or dark red. 



Hymenophore subsessile, caespitose, the numerous pileoli arising from a 

 common trunk or tubercle. Globifomes. 



Hymenophore truly sessile, either simple or imbricate. 



Pileus covered with a horny crust, context punky. Elfvingia. 



Pileus not covered with a horny crust or, if encrusted, context hard 



and woody. Pyropolyporus. 



Context and tubes dark purple or black. Nigrofomes. 



