THE POLYPORACEAE OF WISCONSIN. 55 



p. 141) ; (d) P. salicina, (Seer., 2, p. 174) ; (e) P. tulipiferae, which is 

 broadly effused, white, reflexed; pores subprominent, rough. 



Morgan (1) suggests that "perhaps all are only degenerates of 

 other species." 



Poria vulgaris Fries. 



Broadly effused, white, flesh obsolete, consisting almost entirely of 

 closely packed, minute, round, subequal tubes, about 1 to 2 mm. deep ; 

 margin soon even and smooth. 



Our specimens were collected on the bark of a poplar log at Madi- 

 son; at Devils Lake, Bangor, Ladysmith, Blue Mounds, Algoma, and 

 under the roof of a barn near Oakfield. The specimen on the log 

 covered nearly one-fourth of the log and was limited in its develop- 

 ment apparently by a profuse growth of Polystictus pergamenus. In 

 color it is grayish-white. It is dry, firm, even. The very small pores 

 extend to the very margin. They seem to be mere depressions and are 

 closely packed. They are less than 1 mm. in depth and their diameter 

 varies from 0.1 mm. to 0.2 mm. 



The subiculum is scarcely separable from the substratum except in 

 small pieces, and is somewhat thicker in the center than near the mar- 

 gin. In a thicker form the pores are longer, varying from 1 to 5 mm. in 

 depth and the margin is more conspicuous. The specimens found 

 under the roof boards were more separable and the tubes more or less 

 stratified. 



This species is closely related to P. medulla-panis but is less separable 

 and has smaller pores. 



Poria xantha Schw. 



Resupinate, effused, unequal, subplicate, rugose, determinate; mar- 

 gin undulate, tumid, substerile; pores minute, regular, angular, tub- 

 ules suboblique superficial. 



On bark. Whole fungus fiavescent, hard, dry, 2.5 cm. broad. 



A specimen was found on charred wood in August 1903, near Blue 

 Mounds. It is 12 cm. long ; 3 cm. broad and 1 mm. thick, and is dry, 

 hard, pale yellow becoming brownish in spots. The pores are very 

 small, dissepiments thin; tubes short, oblique. Margin very narrow. 



The species may be known by the pale yellow substance, the narrow 

 margin and the very small pores. 



