THE FUNGI WHICH CAUSE PLANT DISEASE 633 



2-celled 6. Didymosporce. 



3 or more-celled 7. Phragmospors, 637. 



Muriform 8. Dictyosporse. 



Conidia of a stellately arranged group of 



cells 9. Staurosporae. 



Hyalostibeae-Amerosporse (p. 632) 



Bright or light-colored, conidia globose, elliptic or oblong, 

 continuous. 



Key to Genera of Hyalostibes-Amerospors 



Conidial part distinctly capitate or at least 

 terminal 

 Conidia not in chains 

 Head of conidia not gaping or split- 

 ting above 

 Head not spiny 

 Conidiophores of head normal 

 Conidia covered with mucus 

 SjTmema monocephalous 

 Conidiophores dendroid- 

 verticillate 

 Without distinct sterig- 



mata 1. Dendrostilbella. 



With obpiriform sterig- 



mata 2. Pirobasiditim. 



Conidiophores not dendroid- 



verticillate 3. Stilbella, p. 635. 



Synnema polycephalous 

 Capitula on extremely 



short branches 4. Polycephalum. 



Capitula on spreading 



subulate branches ... 5. Tilachlidium. 

 Capitula on erect 



branches 6. Corallodendron. 



Conidia without mucus 

 Sjmnema monocephalous 

 Conidiophores spirally 



twisted 7. Martindalia. 



