New Phoma Disease of the Swede. 



451 



A 



EFlG. 4. — A — Section of a ripe pycnidium partially embedded in the superficial tissues 

 of the host. The spores are seen emerging from the apical pore. (Zeiss D, 

 oc. 4.) B — Group of spores highly magnified. 



by means of a sterile needle and sowing upon a suitable 

 .medium under sterile conditions. I found them to germinate 

 readily upon a medium composed of a broth of steamed 

 -swede, neutralized and rendered solid by the addition of 



Fig. 5. — A spore-mass issuing from a pycnidium. (Zeiss B. oc. 2). 



.five per cent, gelatine. The germination could clearly be 

 •observed under the microscope. First a germ-tube 'Fig. 

 <6 a and b)" was protruded and prolonged into a hypha, 



F F 2 



