x.] "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. VVillkommii (Htg.), which is developing its 

 fructifications (a and F). The mycelium fills up the gaps in the cortex, 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 (in section) ; c, its 

 stalk ; r, the margins of the cup ; A, the layer of spore-sacs (asc i\. B, four of the 

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

 saci ; c, a fully-developed ascus, containing the eight spores ; </, 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 still younger. 

 (After Hartig and Willkomm.) 



very large numbers of the minute spores are formed, 

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



