PLATE 37. 



Xylarieae. 



Fig. 1. Hypoxylon perfbratum, (Schw.), natural size, on dead oak 

 limb. 



2. Same magnified. 



3. A smaller portion containing two perithecia highly mag- 



nified. 



4. A cluster of asci in different stages of growth. 



5. A single mature ascus. 



6. Five sporidia. 



7. Hypoxylon marginatnm, (Schw.), natural size, on dead oak 



bark. 



8. Vertical section of part of a stroina considerably magni- 



fied. 



9. A cluster of asci, one of which is mature. 

 " 10. Three sporidia. 



NOTE.- -Figures on this plate not drawn to any definite scale. 



