536 MINNESOTA BOTANICAL STUDIES. 



9. Section of small strand at point of branching, showing large 

 hy pha at " a " ; central area B ; peripheral area C. x i oo. 



10. Tuber with connecting mycelium and base of an old sporo- 

 phore at A. Natural size. 



1 1 . Section through a small tuber showing continuous mycelial 

 strand. X 5- 



12. Detail of portion of young sporophore shown in Fig. i. 

 X 500. 



13. Diagrammatic view of section of stipe. x 5. 



14. Detail of a fold of pileus tissue. x 500. 



15. Detail of portion of indusium showing large drops of gelatine 

 at hyphal ends. X 500. 



1 6. Portions of hy menial layer in immature sporophore. x 500 



17. Portion of wall of chamber of stipe, x 500. 



18. Diagrammatic view of pileus and gleba immature. x 15. 



19. Detail of portion of tissue of the base of the sporophore. x 

 500. 



