i 74 RESEARCHES ON FUNGI 



stems, etc., above a Petri dish containing malt-agar ; and then, if 

 any of the species desired are present on the under side of the 

 material, they will soon discharge some of their spores into the air 

 and these will fall upon the agar and germinate there. 



There can be but little doubt that certain species of Sporobo- 



Fig. 84. — Sporobolomyces roseus. An S-shaped yeast colony on 

 2-5 per cent, malt-sugar in a Petri dish. Photographed 

 14 days after inoculation. Reduced to seven-eighths the 

 natural size. 



lomycetes are of common occurrence in Western Canada. At 

 Winnipeg, by means of the spore-fall method, in 1928, Hanna 1 

 repeatedly isolated from rusted wheat and oat straw Sporobolomyces 

 roseus Kl. et v. N. and S. albus Hanna, now known as Bullera alba 

 (Hanna) Derx. In 1929, he 2 found S. salmonicolor occurring as a 

 contamination in a plate culture of a Pleospora ; and, in 1932, he 



1 G. R. Bisby, A. H. R. Buller, and J. Dearness, The Fungi of Manitoba, London, 

 1929, p. 80. Here S. albus is described by W. F. Hanna as a new species. 



2 W. F. Hanna, Dominion Rust Research Laboratory, personal communication. 



