THE FUNGI WHICH CAUSE PLANT DISEASE 



483 



Pycnidia single on the stroma 30. Dothiopsis. 



Pycnidia several on each stroma 

 Conidia separate from each other 

 Pycnidia scattered irregularly 

 Stroma sharply defined, globose, etc. 

 Pycnidial chambers appearing as 



enlargements from without ... 31. Anthracoderma. 

 Pycnidial chambers not as above 

 Stroma valsoid 

 Conidia straight 



Conidia large, fusiform 32. Fusicoccum, p. 498. 



Conidia small, ovate, clavate or 



cylindric 

 Conidia ovate or clavate, very 



small 33. Cytosporella, p. 498. 



Conidia larger, ovate, or elon- 

 gate 

 Pycnidia superficial or sub- 

 superficial 



Conidiophores simple 34. Dothiorella, p. 499. 



Conidiophores branched. ... 35. Dothiorellina. 



Pycnidia deep seated 36. Rabenhorstia. 



Conidia allantoid 37. Cytospora, p. 499. 



Stroma pulvinate 38. Fuckelia, p. 500. 



Stroma indefinite, on black spots on 



the host plant 39. Placospheria. 



Pycnidia regularly arranged on the 



stroma around a sterile center. . . 40. Lamyella. 



Conidia adhering basally in fours 41. Gamosporella. 



Pycnidia on each stroma with a com- 

 mon ostiole 

 Stroma globose or flask-shaped; conidia 



curved 42. Torsellia. 



Stroma conic-truncate, conidia elongate 



cylindric, straight 43. Ceuthospora, p. 500. 



Stroma thin, effuse; conidia curved to 



allantoid 44. Plagiorhabdus, p. 500. 



Phyllosticta Persoon (p. 481) 

 Pycnidia immersed, erumpent or with the beak piercing the 



