i8o 



MYCOLOGY 



Fig. 62. — Germination of smut spores, a, Chlamydospores; b, basidium; 5, 

 basidiospores; d, infection threads; e^ detached pieces of mycelia; /, knee-joints, i. 

 Germination of Ustilago avenae in 1/ 50 per cent, acetic acid 24 to 48 hours after being 

 placed in liquid. 2. Same as in i but in distilled water. 3. Germination of Ustil- 

 ago levis in Cohn's modified solution at end of 24 hours. 4. Same as 3 but at end of 

 2 or 3 days. 5. Germination of Ustilago Iritici in Cohn's modified solution. 6. Ger- 

 mination of Ustilago striafortnis from red top in 1/ .50 per cent, acetic acid at end of 

 2 days. 7. S'ame as 6 except in Cohn's modified solution. {After Bull. 57, Univ. 

 III. Agric. Exper. Stat., March, igoo.) 



