THE POLYPORACEAE OF WISCONSIN. % 



This species is occasionally found on pine trunks and stumps. 

 Our specimens were collected at Hazelhurst. Largest specimen 6 cm. 

 wide, 2 cm. long and 2 cm. thick. 



The pilei are usually white with a pale reddish zone near the mar- 

 gin; pulvinate, smooth, the blunt margin somewhat incurved. The 

 flesh pure white-fleshy then corky and brittle. The tubes are long and 

 equal. 



The distinguishing features are the whitish pulvinate pileus and the 

 reddish zone near the margin. This, however, fades on drying. 



Polypoms borealis Fries (Plate XI, fig. 39). 



Horizontal, subspatulate, or reniform, either attenuated behind into 

 a short more or less distinct stem, or thick and sessile, 5 — 7.5 cm. 

 across, whitish then dingy yellow, spongy, then corky, compact, hairy, 

 flesh thick, composed of parallel fibres, whitish; tubes 4 — 6 mm. long, 

 pores unequal, flexuous, dissepiments thin, torn, white ; spores colorless, 

 subglobose, 4 microns in diameter. 



The following forms on varieties occur: montanus; Pileus fleshy, 

 thick, hairy, margin obtuse; pores obtuse, entire; spatulatus; pileus 

 thin, villous, margin acute, extended into a short stem, dissepiments 

 thin, much torn. 



Specimens of this species were collected at Madison, November, 1899, 

 at Horicon, Oakfield and Blue Mounds, on very much decayed poplar 

 logs. 



Largest specimens about 15 cm. wide, 3 — 5 cm. long and 1.5 — 2 cm. 

 thick. The pilei are usually much imbricated and laterally conflu- 

 ent. When fresh they are fleshy but become corky. The substance is 

 white, composed of parallel fibres running horizontally through them. 

 The color above is whitish to straw color; below, a little paler with a 

 suggestion of pink. The surface is very rough in places, being covered 

 ■with scale-like processes which are probably the remains of a strigose 

 pubescence. 



The tubes are long, 1 — 1.5 cm. but of unequal length like those of 

 Trametes. The pores are irregular, sinuous, somewhat radially elong- 

 ated, when old, white-stuffed. The dissepiments are thickish and 

 toothed. When fresh the specimens are inodorous but on drying give 

 out a faint sweetish odor. 



The species may be known by its hispid surface, the fibrous substance 

 and the obtuse, irregular, medium sized pores. 



Syn. : Spongipellis borealis (Fr.) Pat.; 19, 32, p. 475. 



