i8o 



MYCOLOGY 



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

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

 Germination of Ustilago avencB 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 [/i(t/ago (rt(ict in Cohn's modified solution. 6. Ger- 

 mination of Ustilago stri<cformis from red top in 1/ 50 per cent, acetic acid at end of 

 2 days. 7. Same as 6 except in Cohn's modified .solution. (After Bull. 57, Univ. 

 III. Agric. V.xper. Slat., March, iQoo.) 



