EXPLANATION OF PLATE II. 



The Cucumber Mildew. (Plasmopara Cubensis) (B. & C.) 



Fig. ii. A conidial thread arising from a vegetative thread; s/>., two summer 

 spores (conidia). x 540.* 



Fig. 12. A portion of a vegetative thread giving rise to two conidial threads 

 through the same leaf-pore, x 540. 



Fig. 13. A young conidial thread with the spores not yet fully developed and 

 still in place, x 540. 



Fig. 14. A portion of a vegetative thread among the cells of a leaf, four of 

 which are shown, and penetrating them by its haustoria, It. x 540. 



The Mildew of the Star Cucumber. (Plasmopara auslralis Spag.) 

 Fig. 15. A conidial thread and spores; a x 350 ; sf>. spores x 540. 



Fig. 16. A portion of a vegetative thread, with haustoria, h. x 540. 



The Brown Rot of Stone Fruits. (Alouilia frucligena Pers.) 

 Fig. 17. Spore chains, x 540. 



Fig. 18. End of a growing chain, showing beginnings of new spores and origin 

 of branching, x 540. 



Fig. 19. Threads terminating in spore chains, developed in five days from spores 

 sown on nutrient gelatine, x 200. 



Fig. 20. Threads, a, and resting cells (Gemmce), b, from the flesh of "mum- 

 mied" plums, in winter, x 540. 



The " Damping- off" Fungus. (Pythium de Baryanum Hesse.) 



Fig. 21. Two zoosporangia, showing beginnings in formation of zoospores. 

 x 540. 



Fig. 22. A resting cell {Gemma"), x 540. 



Fig. 23. Sexual organs; a, female cell (oogonium), with a single male (antlie- 

 ridiuni) ; b, with two males ; c, resting spore (oospore), formed and 

 fertilized as shown by emptying of male cell, x 540. 



* Sec note to Plats I. 



