PORE FUNGI 



99 



POLYSTICTUS 



Closely related to P o 1 y p o r u s, so closely in fact that it is impossible to draw 

 a sharp line between them. 'Phe cap is usually thinner and more papery, and the 

 pores develop from the back to the edge. Phe cap is usually shelf-like, and so tough 

 as to be of no value as food. 'Phe name refers to the many pores. 



Key to the Species 



Cap white, zoneless 



Cap with distinct concentric zones 



a. Cap many-colored 



b. Cap white or whitish 



P. pcrgaincuiis 



P. versicolor 

 I'. II ir silt IIS 



FlOURE 62. P()I,VPORUS SULPHUKliUS 



Polystictus pergamenus Paper Polystictus 



Cap 2-<S (in. wide, white or whitish, downy or smooth, leather\- or papery, 

 rigid, often concentrically furrowed, but not zoned, shelf-like and imbricated; pores 

 whitish or grayish, finely toothed. Phe name refers to tlie papery texture. 



A'ery conniion on trunks and stumiis. 



Polystictus versicolor Rainbow Polystictus 



Cap 2-10 cm. wide, extremely variable in color, distinctly zoned, with different 

 colors, velvety or silky, leathery, densely imbricated, shelf-like ; ]> o r e s small, round, 

 torn, white to gray or yellowish. P'he name refers to the many colors of the cap. 



I'', very where on stumps and logs. 



