676 THE FUNGI WHICH CAUSE PLANT DISEASE 



Sterile hyphse superficial 

 Fertile hyphae vaguely 

 branched 

 Conidia acro-pleuro- 



gjmous 12. SpoTotrichum, p. 577. 



Conidia on a one- 

 sided sympo- 



dium 13. Monopodium. 



Fertile hyphaj dichoto- 

 mous; conidia ac- 

 Togenous on spine- 

 like branches 14. Langloisula. 



Fertile hyphse erect or as- 

 cending 

 Conidia solitary acrogen- 

 ous 

 Fertile hyphse spiny- 

 branched at apex. 15. Plectothiiz. 

 Fertile hyphse not 



spiny-branched. . . 16. Monospoiium. 

 Conidia loosely grouped 

 about the apex 

 Conidia not involved 

 in mucus 

 Conidia on inflated 



miuiculate apices 17. Phymatotrichum. 

 Apices not muricu- 



late or inflated. 18. Botrytis, p. 578. 

 Conidia involved in 



mucus 19. Tolypomyria. 



Conidia fusoid to cylindric 

 Fertile hyphse mostly pro- 

 cumbent 20. Sporotrichella. 



Fertile hyphae erect or as- 

 cending 

 Conidia fusoid on the 

 upper side of curved 



branches 21. Martensella. 



Conida acrogenous 

 Gonidia^bearing 



branches terete. . . 22. Cylindrophora. 



