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RESEARCHES ON FUNGI 



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Fig. 133. — Tilletia tritici. Diagrams illustrating the mode of measuring the hori- 

 zontal distance to which the basidiospores are discharged. A : a Petri-dish 

 malt-agar culture a has been inverted over a new malt-agar plate b containing 

 a glass ring from which a piece of the side / has been removed. The arrows 

 indicate the path of fall of the basidiospores. After inoculation of the agar 

 in the ring with basidiospores, the dish a is removed and the dish b is covered 

 and left until a mycelial mat has developed at the surface of the agar in the 

 ring. B : another Petri dish in which has been set the glass ring of A, 

 completed by adding the piece /, together with the agar and mycelial mat 

 contained within the ring. The ring has been covered with a cover-glass. The 

 arrows indicate the trajectories of basidiospores shot horizontally away from 

 the mycelial mat. C : appearance of the agar, the mycelial mat, and the 



