THE FUNGI WHICH CAUSE PLANT DISEASE 583 



A single species. P. koleroga Cke. causes a coffee leaf rot in 

 India and has been reported by Fawcett ^'^ as causing serious leaf 

 blight of the same host in the West Indies. 



Verticilliese (p. 566) 

 Conidia acrogenous, on verticillate branches of the conidiophore. 



Key to Genera op Verticillieae 



Conidia solitary or loosely grouped, not in 

 chains 

 Conidia-bearing branches very short, am- 



puUiform 1. Pachybasium. 



Conidia-bearing branches terete or longer 

 Conidia globose to ovoid 

 Tips of branches clavate, in twos 



rectangularly 2. Verticilliopsis, p. 584. 



Tips of branches not as above 

 Conidia conglutinate into a stra- 

 tum 3. Corymbomyces, p. 584. 



Conidia not conglutinate 

 Conidia separating readily from 



the tips 4. Verticillium, p. 584. 



Conidia separating with dif- 

 ficulty from the tips 5. Cladobotyrum. 



Conidia cylindric or elongate 

 Conidia-bearing branches or sporo- 

 phores l-spored 



Sporophores straight 6. Acrocylindrium. 



Sporophores uncinate 7. Uncigera. 



Sporophores several-spored 

 Sporophore inflated verrucose at 



apex 8. Calcarisporium. 



Sporophore incurved, with seriate 



conidia below. 9. Coemansia. 



Conidia capitate or densely spicate, not in 

 chains 

 Conidia sessile 

 Conidia capitate, involved in mucus 



Fertile hyphae smooth 10. Acrostalagmus, p. 584. 



Fertile hyphae asperate 11. Gloeosphaera. 



