THE POLYPORACEAE OF WISCONSIN. 53 



On rotton wood in a greenhouse, also on the underside of a pine 

 drain cover at Madison. Probably fairly common in the state. The 

 specimens found were very well developed forming broad soft almost 

 doughy masses which peel off from the substratum very readily. 



Poria crassa Karst. (Plate IV, fig. 17.). 



Corky, about 1 cm. thick, pores very small stratose, white, yellowish 

 on drying. 



Not very common but the specimens from Shanagolden and between 

 Carr Lake and Little Tomahawk are abundant and well developed on 

 very rotten wood. The largest specimens from Shanagolden are about 

 2 cm. thick and form massive crust like expanses which are quite 

 plainly stratified. The pores are very minute and the surface and 

 outer strata of old specimens are distinctly yellowish-tawny while the 

 deeper layers are white and chalky. 



Poria sinuosa Fries. 



Effused, innate, partly separable from the substratum, coriaceous, 

 persistent, arising from a subradicating evanescent mycelium, at first 

 white, then yellowish ; beneath naked, brownish ; the margin slightly 

 pubescent when young. Pores wide, usually elongated, bent, of differ- 

 ent shapes; dissepiments acute, torn. 



The specimens agree with no. 2408 North American Fungi, but dif- 

 fer from the above description in that they are not "brownish" under- 

 neath, but rather a dirty yellow, as is also the whole plant. At first 

 sight, these forms might be taken for Irpex tulipifera, and for this rea- 

 son, perhaps, they are not collected ; but the polyporoid characters are 

 quite distinct. 



The few specimens collected were found near Madison growing on 

 oak bark. They were broadly effused and thin, about 15 cm. long and 

 10 cm. wide. The subiculum which is slightly separable near the mar- 

 gin is about 0.5 mm. thick, and the pores vary from .5 to 1.5 mm. in di- 

 ameter and are about 2 mm. deep. The dissepiments are thin and 

 toothed at first then torn. The pores are irregular and evenly sinuous. 

 Old specimens are nearly emarginate. The very young ones which 

 start as small papilliform bodies have a wide margin made up of white 

 almost membranaceous mycelium, the pubescence being scarcely per- 

 ceptible. 



The color of the fungus is at first white but becomes a dirty-yellow 

 on drying or maturing. The fungus is leathery and tough when fresh 

 but is brittle when dry. 



