POLYPORUS. 



441 



-terns of oak-trees. At first they are soft, later hard ami l>ruwn 



with grooves on tin- iij>i>er side. Tin- dark heart-w 1 ..( tip- 



nak (.'.xhiliits white ur yrllwMi lun-itudinal -tri]"-- "f mut-n 

 W(.nd enlivened into cellulose ( Fi-. L'Tl'i. In the white ]H.rii(.n> 



. 



; 



: : 



I hum I'm ins 1 



In the i 'it pii"i. i 



lli' 1 destruction is inmv i-mnjilfti' than in tin 1 yrll.iw. \shriv di^- 

 Milnti.,11 <if llit- lanii-llar ha> II"! fiti \ fl lak'-n pl,n-'' I fig. 273), 



A simultaneous d<--tMn-i j..n "f iln- \\ ..... I \<\ /'. << and 



. 



/' >> may OCCUI (Fig. 274); ill tin- Case, th.- nn-did. 



