Sept., me.] T. IIEMMT.— DIE-BACK DISEASE OF PAULOWNIA. 



309 



4.38-5.25 X lAf^) in size. They arc usually allantoic! in shape 

 with rounded ends, and sometimes cylindrical. The spore-wall 

 is smooth and colorless. 



Fig. 4. a. Section of matured ectostroma and pycnidium. (Leitz 1 X 3). 



b. Pycnospores. (Zeiss F x 4). 



c. Germinating pycnospores. (Zeiss F X 4). 



d, e. Sections of matured entostroraa. (Leitz 1 X 3). 



/. Asci and ascospores. (Zeiss DD X 4). 



g. Ascospores, (Zeiss F X 4). 



h. Germinating ascospores. (Zeiss. DD x 4). 



The p3'cnospores do not germinate well in water. When 

 placed in a drop of nutrient media, the spores swell at first 

 and then germinate within 30-40 hours in the room tempera- 

 ture, throwing out one or two germ-tubes at the ends or rareh' 

 from a side of the spores. The degree of the swelling of the 



