THE POLYPORACEAE OF WISCONSIN. 45 



The largest specimen was found on a tamarack near Star Lake. 

 This measured about 24 cm. broad, 14 cm. long and 6 cm. thick be- 

 hind. The base was strongly decurrent and many smaller pilei were 

 growing out of it. The tubes were about 1 cm. long, distinctly strati- 

 fied and in some places made up of 2 and 3 strata. The specimens 

 collected from the pines and spruces are always much smaller and 

 agree more exactly with Professor Peck's description of P. piceinus. 

 Specimens collected on hemlock logs are larger than those on pines 

 but not so large as those on tamarack. Von Schrenck has found the 

 species on fir trees in the New England states, but says that it is rare. 



The specimens when dry are very hard and somewhat brittle. In 

 color and general appearance they resemble somewhat Fomes con- 

 chatus but the color inclines more to reddish-brown and the pores 

 fire much longer and more irregular. The older part becomes black, 

 rimose and moss-covered. When young and growing, the margin is 

 of a golden-brown and is covered with a soft velvety tomentum. 



The La Crosse County specimens were found on the exposed root 

 of a living white pine. 



Syn. Polyporus pini Pers. ; 23, vol. 11, p. 83. 



Porodacdalea pini (Thore) Murrill; 19, vol. 32, p. 367. 

 Polyporus piceinus Peck ; 22, no. 42, p. 25. 

 Trametes abietis Karst. ; 56, vol. VI, p. 346. 



8. PORIA. 



This genus is made to include all forms which are entirely resup in- 

 nate. They may be thin membranaceous, fleshy or almost corky ex- 

 pansions or incrustations. A true Poria should never be reflexed. 

 This is the tribe Resupinatae under Polyporus of the older authors. 

 It is considered by some to consist of simply young or abnormal forms 

 of Polyporus. 



Forms whose pores break up readily into teeth are with difficulty 

 separated from Irpex, and thus endless confusion arises. 



The genus is abundantly represented throughout the state. 



KEY TO WISCONSIN SPECIES OF PORIA 



Pale or white forms 1 



Darker or bright colored forms 2 



1. Growing on the ground P. terrestris 



1. Not on the ground 3 



2. Yellow from the start P. nitida 



2. Pale yellow, soft P- vitelline 



