218 



^lANUAL OF POISONOUS PLANTS 



Fig. 57, Smut spores of various kinds. 1. Tall meadow 

 oat smut ( UsHlago perennans) . 2. Timothy smut ( U. striae- 

 formis). 3. Rye smut (Urocystis occulta). 4. Cheat smut 

 {Ustilago bromivora). 5. Foxtail smut (U, neglecta). 6. Mil- 

 Jet smut ( U. panici miliacei) . 7. Sandbur smut ( U. Cesatii) . 

 8, 9- Tilletia germinating, 10. Secondary spores from conid- 

 ia. 11, 12. Urocystis spores germinating. 13, 14. Mycelium 

 of same. h. Suckers or haustorja. h. Hyphae passing from 

 one leaf to another. 8-14 after Wolff. 



