MurRRILL: POLYPORACEAE OF NortTH AMERICA 427 
A brief synopsis of the genera treated in articles I-WIII of this 
series 
Surface of hymenophore covered with reddish-brown varnish, context corky. 
Ganoderma. 
Surface of ele ogi not as above, or, if so, context woody. 
Hymenophore annual. 
Tubes Hiss 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 saverted eubie from lenticels. Poradtscus. 
Pileus erect, not e 
Context sso ti firm. shes gies 
Context duplex, spongy above, woody be 
Prieta: 
Context brown, 
Hymenium concentrically lamelloid, Cycloporus. 
Hymenium poroid. 
spores white. Romellia. 
Spores brown 
Pileus erect, stipe central. Coltricta. 
Pileus inverted, pendent. Coltriciella. 
Hymenophore sessile. 
hite. 
Tubes at length separating from the context, surface smooth. 
Piptoporus, 
‘Tubes not separating from the context, surface zonate. 
oronidulus. 
Context red. Pycnoporus. 
Context brown. 
Spores white. Hapalopilus. 
Spores brown. Cyclomycetella. 
Hymenophore perennial. 
Context and tubes white or pal 
menium at first ke by a volva, Cryptoporus. 
Hymenium free from the — fomes. 
Context and tubes brown or dar 
Hymenophore subsessile, See. the numerous pileoli arising from a 
ommon trunk or tubercle. Globifomes. 
Hymenophore truly ae either simple or imbricate. 
Pileus covered with a horny crust, context punky. Elfvingia. 
Pileus not tant with a horny crust or, if encrusted, context hard 
and woody. Pyropolyporus. 
Context and tubes dark purple or black. Nig rofomes. 
