Fig 



198. — Pleurotus ostreatus. Fruit-hodies growing on the trunk of the same Silver 

 Maple (Acer saccharinum) as that shown in Fig. 197. Pilei fully expanded. Photo- 

 graphed at Ithaca, New York State, on October 25, 1911, by C. D. Learn. About 

 ^ natural size. 



VOL. III. 2 1 



