THE FUNGI WHICH CAUSE PLANT DISEASE 501 



Conidia not in chains 

 Pycnidia sessile, spheroid 



Pycnidia beaked 2. Nsmosphsera. 



Pycnidia not beaked 

 Conidia spindle-form, with 



both ends light colored. . 3. Hypocenia. 

 Conidia globose to elliptic 

 Pycnidia opening irregu- 

 larly 4. Harknessia. 



Pycnidia opening by a regu- 

 lar ostiole 

 Conidia large, ovate to 



elliptic 5. Sphsropsis, p. 501. 



Conidia very small, glo- 

 bose to ellipsoid .... 6. Coniothyrium, p. 503. 



Pycnidia stipitate, clavate 7. Levieuxia. 



Pycnidia hairy or setose 8. Chsetomella. 



Pycnidia with distinct mycelium or 

 subicle 

 Pycnidia astomous, in a dark subicle . . 9. Capnodiastrum. 



Pycnidia perforate 10. CicinnobeUa. 



Pycnidia cespitose or in a stroma 



Pycnidia in dense erumpent clusters 11. Haplosporella. 



Pycnidia not as above, in a definite 

 stroma 

 Stroma applanate or effuse, foliicolous . 12. Discomycopsis. 

 Stroma dot-like, discoid or hemi- 

 spheric 



Stroma dot-like, immersed 13. Melanconiopsis. 



Stroma discoid to hemispheric 



Stroma discoid; spores large 14. Nothopatella. 



Stroma pulvinate; spores minute, 



catenulate 15. Cytoplea. 



Stroma hemispheric ; pycnidia 



circinate 16: Weinmannodora. 



Sphseropsis lAveiM 



Pycnidia immersed, erumpent, globoid, black, leathery, mem- 

 branous, with the ostiole papillate; conidia ovate or elongate, 

 conidiophores rod-like. 



