482 THE FUNGI WHICH CAUSE PLANT DISEASE 



Spores pointed 12. Sclerotiopsis. 



Spores blunt 13. Plenodomus. 



On Erysiphaceae 14. Cicumobolus, p. 494. 



Pycnidia beaked 15. Sphaeronema, p. 494. 



Fycnidia on a subiculum 

 Conidia ovate or elongate 

 Subiculum of simple hyphse 



Pycnidia free 16. Byssocystis. 



Pycnidia sunken in the subiculum. . 17. Chaetophoma, p. 495. 



Subiculum radiate 18. Asteroma, p. 496. 



Conidia Y-shaped 19. Ypsilonia. 



Conidia appendaged 20. Neottiospora. 



Conidia in chains 



Conidial chains separate and simple ... 21. Sircoccus. 

 Conidial chains connected, often form- 

 ing a net 22. Pecia. 



Pycnidia appendaged or hairy 

 Appendages simple 

 Pycnidia with short simple tubercles; 



conidia irregular in outline 23. Muricularia. 



Pycnidia with long bristles; conidia 



regular 

 Bristles septate, usually covering the 

 entu-e pycnidiimi, conidia cylin- 



dric fusoid, usually curved 24. Vermicolaiia, p. 496. 



Bristles usually only at the apex; 

 conidia ovate, elongate or cylin- 



dric, straight 25. Pyrenochseta, p. 497. 



Appendages stellate at the apex 26. Staurochsta. 



Pycnidia stromatic, superficial or sunken 

 Pycnidia single on the stroma 

 Pycnidia with a single chamber 



Conidiophores filiform 27. Phomopsis, p. 493. 



Conidiophores indistinct or absent 



Stroma indistinct 28. Plenodomus. 



Stroma rather well developed 29. Sclerophoma. 



Pycnidia typically with more than one 



chamber 12. Sclerotiopsis. 



Pycnidia with well developed stroma, free 



or buried 

 Pycnidia with separate mouths 



