THE POLYPORACEAE OF WISCONSIN. 51 



are the same in size, very irregular, almost sinuous when old, because 

 of the breaking down of the thin dissepiments. 



Quite rare. A few specimens were collected at Horicon in 1899 on 

 a rotten willow ; and some specimens were collected near Blue Mounds. 

 The largest specimens are about 16 cm. long, 3 cm. wide ; the whitish 

 margin is very thin and sometimes even obsolete. 



This species is closely related to P. violacea, but is darker in color 

 and is distinguished by the white margin. The color is well preserved 

 in our specimens. 



Syn. Polyporus purpureus Fries; 28, I, p. 412. 



Poria crocipora Berk. Curt. 



Effused, pulvinate, 'thick in drying blackish-rufous ; margin obtuse ; 

 tubules elongate, medium, dissepiments thin, flaccid, saffron. 



On decayed wood. 



The specimen referred to here was found near Blue Mounds on very 

 much decayed wood. It is about 10 cm. long and 4 cm. wide. In color 

 it is dark-red; the pores short and very small; the flesh thick. It is 

 darker in color than P. rufa Schrad., and has thicker flesh. This spe- 

 cies was identified by Bresadola. 



Poria marginella Peck. 



Resupinate, effused, forming extensive patches 2 — 6 mm. thick; 

 subiculum distinct, firm, subcinnamon, the extreme margin white, be- 

 coming dark-ferruginous with age ; pores at first short sunk in the to- 

 mentum of the subiculum, then longer, minute, rotund, often oblique, 

 brownish ferruginous; glaucous within; dissepiments thick, obtuse. 



Not common. Some specimens were found under old pine logs near 

 Ladysmith in August 1905. Specimens collected on Picea mariana, in 

 September, were remarkable for, and very distinct by reason of the 

 narrow downy white margin that borders the growing plant. 



The largest are 8 cm. long, 3 cm. wide and about 3 mm. thick. When 

 fresh they are soft, moist, pale cinnamon except the margin which is 

 white or pale yellowish-white, tomentose. The pores are very small 

 equal, pale cinnamon and pruinose. When old and while drying they 

 become dark brown. 



The species is easily recognized by the cinnamon-colored pores and 

 substance surrounded by the bright white or pale-yellowish margin. 



