THE POLYPORACEAE OF WISCONSIN. 49 



in length. The longest ones measured 3 mm. The younger pores are 

 mere depressions in the subiculum. 



Syn. : Polyporus molluscus (Pers.) ; 28, I, p. 408. 



Poria viridans Berk, and Br. 



Effused, crustaceo-adnate, thin, at first white, later pale-greenish, 

 with the margin pulverulent tomentose; pores small; angular, dis- 

 sepiments thin. 



On decayed wood, with the habit of P. vulgaris 



"On rotten wood. Effused, forming patches a few inches long, per- 

 fectly white at first, but in drying assuming a delicate pale green, with 

 honey-like tinge in parts; border pulverulento-tomentose, very thin; 

 pores minute, angular, dissepiments thin. This pretty species has the 

 habit of P. vulgaris (B. & Br.) (17, p. 204.) " 



Specimens of this species were found near Madison, October 5, 1901, 

 on very rotten wood. It was very thin, dirty-yellowish with a pale- 

 greenish tinge. The margin is very thin, lighter in color. The pores 

 are small; if oblique they are irregular, sinuous; when not oblique 

 they are angular, small. 



The species may be known by its thin substance and pale-greenish 

 tinge. 



Syn. Polyporus viridans. Berk. & Br. ; 28, I, p. 410. 



Poria attenuata Peck (Plate IV, fig. 19). 



Resupinate, effused, very thin, separable from the matrix, pinkish- 

 ochre, the margin whitish; pores minute, subrotund, with thin acute 

 dissepiments. 



Comparatively common on bark, sticks and fence rails. Specimens 

 have been found near Madison, Oakfield, Horicon and Sparta. The 

 largest are about 20 cm. long and 10 cm. wide; the subiculum is less 

 than 1 mm. thick. The pores are 1 mm. or less in length and are ex- 

 tremely small. 



The margin is irregular, white, and somewhat tomentose, as is also 

 the subiculum. This is only slightly separable from the substratum. 

 The color of the pores is pinkish or yellowish-pink when fresh ; in some 

 cases verging towards lilac. In drying it changes to a reddish-tan. 

 The surface is smooth and even, the pores being round, regular and 

 sometimes oblique. Easily recognized by the thin even substance, the 

 white border and the color of the pores. 



4 



