194 



THE ASCOMYCETES 



Fig. 73. Various Hypocreales. A. Cross-section of stroma of Epicbloe 

 typbina. The stroma invests the leaf sheath and cuhn, and the pinkish 

 perithecia are seated in the stroma. B. Ascus of E. typbina containing 

 eight thread-Uke ascospores. C. Habit sketch of Cordyceps claviilata on 

 Lecanium on twig of mulberry. D. Tip of clava enlarged, indicating ar- 

 rangement of perithecia. E. Single, segmented, filamentous ascospore. F. 

 Sepedonium or chlamydospore stage of Hypomyces. G. Ascospores of 

 Hypomyces, parasitizing Russula. H. Ascospores of Gibberella saubinettii, 

 from wheat. /. Conidia of the Fusarium stage of the wheat-scab pathogen. 



