CONTEXT AND PORES WHITE OR PALE. 



While it is usually sessile, it is not dimidiate (as Quelet states), 

 for it is really stipitate with a suppressed stipe. Rarely the stipe is 

 developed, and the plant is always attached by a small attachment. 

 The plant starts to grow as a white ball, as shown in our figure 632. 

 When old the pores have a tendency to peel away from the flesh, 

 and the jugglers have made this an excuse for a genus. Compare 

 Polyporus Eucalyptorum in next subsection. 



Fig. 631. Fig. 632. 



Polyporus betulinus. Fig. 631 as it grows in natural surroundings. Fig. 632 incipient growth. 



ILLUSTRATIONS. Many, mostly good. Sow, 212; Gillet, etc.; \Vhite, Connecticut t. 37 is 

 very characteristic of the plant as it grows. The original Bulliard 312 is fair, but too brown in color. 



SPECIMENS. Many from Europe and United States. (Australian specimens that we have 

 referred here belong to Polyporus Eucalyptorum.) 



Compare suberosus. 



POLYPORUS ALBELLUS. Pileus dimidiate, sessile, usually 

 l>^-2 inches in diameter, often imbricate, but rarely, if ever, subre- 

 supinate. Surface smooth, with a very thin crust. Color of surface 

 usually grayish or yellowish, sometimes white. Flesh drying white, 



294 



