[Vol. 10 



144 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



what more pointed at one end than at other, but average shorter 

 than on host tissue. 



Rice. — Autoclaved 10 gms. rice in 20 cc. tap water in 100-cc. 

 flask. Inoculated March 31, 1921. On April 5, mycelium pro- 

 fuse, loose, high, white. April 15, mycelium profuse, moderately 

 dense, white, covering and permeating substratum. May 15, 

 surface mottled with yellowish, white, and black areas. July 20, 

 surface brown with darker brown areas; reverse with black 

 areas. No pycnidia. 



Oats. — Autoclaved 5 gms. rolled oats in 15 cc. tap water in 

 100-cc. flask. Inoculated March 31, 1921. On April 5 mycelium 

 profuse, loose, high, white. April 15, mycelium moderately 



dense over surface but not visible in reverse, white, yellow, black, 

 and brown areas, black marginal line against glass sides of flask. 

 May 15, surface with white, black, and brown areas; substratum 

 yellow, black stromatic masses present; no pycnidia. July 20, 

 surface mostly white, but with citron and light brown areas. 

 No pycnidia. 



Corn meal mush. — Autoclaved 5 gms. corn meal and 15 cc. 

 tap water in 100-cc. flasks. Inoculated March 31, 1921. April 

 5, mycelium profuse, dense, moderately high, white. April 15, 

 mycelium white with yellowish and dark areas, black marginal 

 line against glass. May 15, surface of mat with white, black, and 

 yellowish areas; black stromatic masses but no pycnidia present. 

 July 20, no pycnidia. 



Potato glucose agar. — Test-tube cultures inoculated March 31, 

 1921. April 5, mycelium white, loose, growing high up sides of 

 tube. April 15, mycelium matted, white; reverse and marginal 

 line black. May 15, surface white with black areas; reverse 

 very black; no pycnidia. July 20, no pycnidia. 



Bean agar (Harshberger, '17). — Test-tube cultures inoculated 

 March 31, 1921. April 15, mycelium loose, high, white. May 

 15, mycelium prostrate and appearing sparse; stromatal masses 

 large and numerous; no pycnidia; reverse white. July 20, no 

 pycnidia. 



After discovery of the ascospore strain No. 17, it was compared 

 culturally in another series with strains 7, 14, and 19. Aside 

 from minor variations in respect to color changes, No. 17 differs 



