EXPLANATION OF PLATES 



All the plates were reproduced by three-color process from living cultures. The cultures 

 were in all cases, unless otherwise specified, forty days old when photographed, and were 

 grown at laboratory room temperature ranging from 20° to 25° C. 



Cultures of Plates I to IV were, with a few specified exceptions, grown on hard potato agar 

 with 10 per cent glucose, and were kept in a strong diffuse daylight and in air nearly saturated 

 with moisture. 



All cultures of Plates V to VII were on sterilized potato tuber plugs in test tubes which 

 were kept at the above temperature but in very weak diffuse light. » 



PLATE I. FUSARIA OF POTATOES 



Fig. 1. Fusarium Solani, from above 



Fig. 2. F. striatum, from above 



Figs. 3 and 4. F. Martii var. minus: 3, on acidified medium from below; 4, on hard 



oat agar from above 

 Figs. 5 and 6. F. coeruleum, from above and below 

 Figs. 7 and 8. F. oxysporum var. resupinatum, from above and below 

 Figs. 9 and 10. F. lutulatum var. zonatum, from above and below 

 Figs. 11 and 12. F. sclerotioides, in dark, from above and below 



