14 CIRCULAR NO. 131, BUREAU OF PLANT INDUSTRY. 



growth was very similar in character to that of Endotliia 'parasitica, 

 especially the pure white portion near the margin. The older por- 

 tions appeared slightly coarser and tufted. Cultures on the same 

 medium 1 month old showed a still coarser aerial grow^th, with the 

 very youngest portions nearly white, but the greater part of the 

 growth was orange rufous. Tliis color was also present wherever 

 the mycelium came m contact with the flask. The culture medium 

 show^ed no change in color. Spore masses appeared in these cul- 

 tures in about the same time as in E. imrasitica. They were scattered 

 and inconspicuous on account of bemg practically the same color as 

 the older portions of the mycehum, and were practically the same 

 size and character as in E. parasitica. 



EndotMa gyrosa. — Cultures made from mycelium, no pyonospores 

 being available, showed a superficial growth covering the surface 

 of the medium. The mycehum was of a softer and more cottony 

 appearance than in the other species, and pm'e white except a small 

 portion at the point of inoculation, which was ochraceous buff. Cul- 

 tures a month old showed a more compact surface, which was rather 

 pulvinate or pustulate. The spore masses were of the same ochra- 

 ceous-bufF color, and the other portions lighter. The margin in 

 contact with the flask was dark brown. 



CULTURES ON RICE. 



EndotMa imrasitica. — In cultures 1 week old the growth covered 

 about one-fourth of the surface of the medium with a scanty supei-ficial 

 mycelium. The mycelium was white, flecked with buff yellow, the 

 color being more conspicuous at the margin. The color of the medium 

 was unchanged. No spore masses were found. 



The same fungus in cultures 1 month old showed the surface growth 

 unchanged in character, but dirty white with numerous small spore 

 masses which were somewhat confluent near the center of the growth 

 and showing a pale yellow ocher color. The medium was mostly 

 tea green on the bottom, streaked with lighter green, giving it a 

 marbled a]>pearance. The mycelium on the bottom of the flask 

 was about the same color as the spore masses. 



Endotliia radicalis. — Cultures 1 week old showed a loose, fluffy, 

 erect mycelium covering nearly the whole surface of the mycelium. 

 This was deep chrome to light orange yellow at the point of inocula- 

 tion, passing through perilla purple and light pinkish lilac and fading 

 into white at the margin. The mycelium had penetrated to the bottom 

 of the flask, producing a sort of mosaic of colors. Wliere the rice 

 grains came in contact with the glass they were perilla purple, and 

 in the interstices the mycelium varied from apricot yellow to white. 

 No spore masses were present. 



[Qr. 131] 



