X.J 



"CANKER": THE LARCH DISEASE. 



237 



spores ; but we may pass over these particulars 

 here, the chief point for the moment being that 



Fig 36.— a, vertical section (magnified) through the dead cortex of a larch, infected 

 with the mycelium {d) of Peziza Willkommii (Htg.), ^vhich is developing its 

 fructifications {a and F). The mycelium fills up the gaps in the corte"«c, d^ with a 

 white felt-work, a is a boss-like cushion of this felt-work bursting forth to become 

 a cup-like fructification ; -F, the mature Peziza fructification (m section) ; r, its 

 stalk ; r, the margins of the cup^ ; h, the layer of spore-sacs (awra). B, four of the 

 asci from \ very highly magnified, a^ hair-like barren filaments between the 

 saci ; <;, a fully-developed ascus, containing the eight spores ; d^ an ascus emptied 

 of spores (they have escaped through the hole at the apex) ; b^ a young ascus in 

 which the spores are not yet formed : to the left below is a small one stiU younger. 

 (After Hartig and Willkomm.) 



very large numbers of the minute spores are formed, 

 and .scattered by the wind, rain, animals, &c. More- 



