510 THE FUNGI WHICH CAUSE PLANT DISEASE 



Key to Sph£erioidaceaB-Phseodidym» 



Pycnidia separate 

 Pycnidia beaked 



Pycnidia hairy 1. Rhynchodiplodia, p. 510. 



Pycnidia smooth 2. Pellioniella. 



Pycnidia not beaked 



Pycnidia hairy 3. Chsetodiplodia, p. 510. 



Pycnidia smooth 



Conidia with a mucous layer, 



very large 4. Macrodiplodia. 



Conidia without a mucous layer 

 Pycnidia erumpent, conidia 

 muticate 

 Conidia less than 15 /* long. 5. Microdiplodia, p. 510. 

 Conidia 15 /* or more long. 6. Diplodia, p. 511. 

 Pycnidia superficial, lignicole. 7. Diplodiella, p. 512. 

 Pycnidia cespitose or in a stroma 



Pycnidia cespitose 8. Botryodiplodia, p. 513. 



Pycnidia in a stroma 

 Pycnidia and subicle enclosed in a 



hemispheric stroma 9. Lasiodiplodia, p. 513. 



Pycnidia without subicle, in a 



globose stroma 10. Diplodiopsis. 



Rhynchodiplodia Briosi & Fameti 



Pycnidia rostrate, pilose; conidia oblong. 



A single species, R. citri B. & F., causes disease of the lemon. 



Chsetodiplodia Karsten 



Pycnidia erumpent, globose, ostiolate, black, membrano- 

 carbonous, hairy or bristly; conidia elongate. 

 A genus of about ten species, chiefly saprophytes. 

 C. vanillae Zimm. is on vanilla. 



Microdiplodia Allescher 



Pycnidia subcuticular, erumpent, membranous to subcarbon- 

 ous, globose or depressed, minutelj' ostiolate; conidia ovoid to 

 oblong, small, (under 15 /i.) 



