132 



COMPARATIVE MORPHOLOGY OF FUNGI 



Fig. 81. — Phyllactinia corylea. 1. Young ascus with dicaryon. 2 to 4. Caryogamy. 

 5. Spireme. 6 to 9. Steps in division of primary ascus nucleus. Erysiphe cichoracearum. 

 10 to 12. Spore formation. 13. Immature ascus. (1 to 5 X 1,500; 6, 13 X 1,000; 7 to 12 X 

 670; after Harper, 1905.) 



