VIIL] NEW DISEASE OF ONIONS. 41 



cells of the scape are illustrated at BB ; between these 

 positions the fungus named Puccinia mixta, FL, is seen. 

 The parasite consists of club-shaped bodies, each consisting 

 of a brown head supported on a transparent peduncle or 

 stem, the whole growing from a matted base of brownish 

 fungus spawn or mycelium within the substance of the 

 invaded plant. It will be noticed that the brownish 

 bodies supported on the slender stems are of two classes, 

 one perfectly simple, consisting of a single cell ; the other 

 of two conjoined cells, or of a larger cell with a distinct 

 transverse joint or septum across the middle. These 



B 



X-20Q- 



FIG. 13. 



Pucdnia mixta, Fl. Section through a sorws. 

 Enlarged 200 diameters. 



bodies are spores of a peculiar class, possessing the func- 

 tions of res ting-spores, and called technically teleutospores ; 

 the latter term meaning "finishing spores," or the last 

 spores produced ; from teleutao, finishing. From the oc- 

 currence of the two sorts of spores in each sorus the fungus 

 under description has been specifically distinguished under 

 the name of mixta. The two varieties of teleutospore are 

 farther enlarged to 1000 diameters at Fig. 14 to show 

 more clearly the cell- walls. Under the microscope the 

 colour of the spores is rich transparent yellowish-brown ; 

 the supporting threads are almost colourless. In some 



