i'i.vroi;i -. 439 



Seynes, 1 three other kinds of spores are produced in addition 

 to hasjdiospores. 



Willow, poplar, oak. sweet chest- 

 nut, alder, ash, ha/el, pear, chei i \ 

 rohinia, lardi, silver fir, etc., are 

 common hosts of this parasite. 



\V 1 infested hy the mycelium 



darkens in colour, exhihitiiii; a red- 

 rot. Vessels and all clefts or -paces 

 become rilled with white felled 

 mas-e- of mycelium. The \\ood, in 

 course of destruction, becomes richer 

 in carbo-hydrates, and the walls of 



' 



the wood-fibres shrink so that tis- 



-ures with an upward ri-ht to left 



direction are form,, 1. luit do not reach ,,,. .... 



the middle hiineliie Kiirdlv 1 he "' ll Ii: ' wi! ' : "" 1 



tnn n.ii . r mail) \.. , n n 



Wood In-come- dr\'. hrittle, and powdeiy. 



Polyporus borealis (Wahlenk) Fr. - ( I'.ritain and I'.S. 

 America!. Sporophores animal, white, and tle-hy : the upper 



' 







i 

 -ill-face i- -ha'j'j\' \\heii I'le-h. and no iiiternal ZODefi ttri cxlnl.iled. 



The -hape i- -oliieuhat cll-!lio|i o| Ll .H'kel -like, hilt \-l\ V.illal'le. 



1 1 - i ,/,/..* I , \ ,,1 i I -i, i 



- \(. H,ti\.\^. Z' i mint'/- n. I'l. \ 



