EXPLANATION OF PLATES 



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

 were in ail 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. FLSARIA 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 (i. F. coeruleum, from above and below 

 Figs. 7 and 8. F. oxysporurn 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 



