274 



MANUAL OF POISONOUS PLANTS 









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Fig. 96. — Normal ovary of rye. Fig. 2 — Same invaded by Claviceps. Fig. 3 — Cross-sec- 

 tion of ovary showing mycelium and spores of sphacelial stage. The round bodies are 

 summer spores. Fig. 4 — Sclerotium stage. Fig. S — Sclerotium stage. Fig. 6 — General 

 view in sphacelial stage. Fig. 7 — Development of ergot in spring. Fig. 8 — Cross-section of 

 globular head showing flask shaped perithecia. Fig. 9 — Asci. A single perithecium show- 

 ing elongated bodies in the center. Fig. 10 — A single ascus with filiform ascospores pro- 

 truding. These spores (reproductive bodies) germinate and infect the young ovary of 

 rye. After Tulasne. U. S. Dept. Agrl. 



