PLATE X 



Fig. I. — A sporophore of Polyporus dryophilus, front view showing the margin, on 

 Populus ircmuloides; from Colorado. 



Fig. 2. — A second sporophore from the same tree as figure i, showing an imbricated 

 form. 



Fig. 3. — A view of the upper surface of a sporophore of Polyporus rheades on Populus 

 Ircmula; from Stockholm, Sweden. 



Fig. 4. — A sectional view of a sporophore of Polyporus corruscans on Quercus; from 

 Upsala, Sweden. 



Fig. 5. — A side view of an imbricate sporophore of Polyporus dryophilus, applanate 

 form on Populus ircmuloides; from Colorado. 



Fig. 6. — A sectional view of the same sporophore as in the preceding figure, showing 

 the hard granular core and whitish mycelial strands. 



Fig. 7. — A view of the upper surface of an applanate sporophore of Polyporus 

 dryophilus on Quercus alba; from Arkansas. 



Fig. 8. — The pore surface of a sporophore of Polyporus dryophilus on Populus tremu- 

 loides; from Colorado. 



