258 TIMBER AND SOME OF ITS DISEASES, [chap. 



ix, the variety which lives upon the needle-like 

 leaves). 



On the younger branches of the Scotch pine, 

 the Weymouth pine, the Austrian pine, and some 

 others, there may also be seen in May and June 

 similar but larger bladder-like orange vesicles 



Fig. 38. — Blisters {^cidid) oi Peride-nnium. /'/^/(var. corticold) on a branch of the 

 Scotch pine : some of the ^cidia have already burst at the apex and scattered 

 their spores, 3, b ; the others are still intact. (Natural size, after Hess.) 



{^cidia) bursting through the cortex (Figs, "^"j and 

 38); and here, again, careful examination shows the 

 darker smaller spermogonia in patches between 

 the cBcidia, These also arise from a fungus- 

 mycelium in the tissues of the cortex, whence the 

 fungus was named Peridermium Pint (var. 



