USTILAGINALES 



605 



Fig. 400. — Tuburcinia Trientalis. 1. Section through an infected leaf. The conidio- 

 phores force their way between the epidermal cells. 2. Conidia germinating to secondary 

 spores, c, in damp air. 3. Conidia germinating in water at the end of six hours. 4. Section 

 through a stem, showing spore balls, Sp. 5, 6. Development of a spore ball. 7. Germi- 

 nating spore ball. 8. Normal promycelium. 9. Basidial cells with four or eight basidio- 

 spores which have separated from the promycelium. 10. Later stage with copulation 

 completed. 11. Sporidia germinating with secondary and tertiary spores. (1, 2, 5, 6 X 

 215; 3, 7, 8, 11 X 345; 4 X 60; 9, 10 X 415; after Woronin, 1881.) 



