[Chap. XLIV 



THE FUNGI 



563 



Fig. 251. Photograph of a fohose hchen (above) and a crustose hchen (below) 

 on a rock substrate. Several cup-shaped ascocarps of the fungus in the foliose 

 lichen are evident. Photo by G. S. Growl. 



Fig. 252. Two species of reindeer lichen on a moss substrate. Photo by C. H. Jones. 



