278 



STRUCTURE AND LIFE HISTORIES 



composed of innumerable hyphae (Fig. 201), closely asso- 

 ciated together in a pseudo-tissue, but there is no real 



Fig. 201. — Coriinarhis cinnamomeus. Above, longitudinal section 

 through stipe and pileus, showing gills (g); below, longitudinal section 

 through primary and secondary gills; h, hymenium or sporogenous surf ace. 

 (After Gertrude E. Douglas.) 



tissue-differentiation, such as occurs in the mosses and 

 ferns and higher plants, though the external layer may 

 usually be peeled off with ease. 

 270. Reproduction.— If the pileus of Agaricus is placed 



