FUNf4I ATTACKING CONES. 



473 



there being at least two aecidia on each scale of the affected 

 cones. After the aecidia burst and disjDerse their spores, pale 

 spots are left on the scales. 



Fig. 230. — Spruce cone attacked 

 by Aeciditim strohilinum, Rss. 



Fig. 231. — Sporophores of A. 

 strohilinum, Alb. et Schw., on 

 the under surface of a scale of 

 a spruce cone. 



Section III. — Fungi attacking Broadleaved Trees. 



The numbers of dangerous fungi attacking broadleaved 

 trees may be limited for description hare, to eight, besides 

 some wound-parasites. The most destructive are marked 

 with an asterisk, as in the list given on the next page. 



A. Root-fungi. 



*1. llosellinia qnercina, E. Hrtg. 



a. De.scripliofi and Lifp-hislonj. 



The leaves of infected 1 to 3 years old oak seedlings become 



gradually pale and at length dry up. This commences with 



the topmost leaves and proceeds downwards. At the top of 



the taproot just below the surface of the ground, the bark 



and wood turn brown and shrivel up, and this at length 



spreads to the whole taproot and the plant dies. On pulling 



up the plant and examining its tap-root, black spheroidal 



sclerotia of the size of a pin's head are seen, which spring 



from numerous brown rhizomorphs, which have branciied 



freely and surround the plant's roots, and are prolonged into 



