I 
PLATE IV 
Fig. 
1. Melampsova pinitorqua, Rostrup, a chain of aecidiospores ; mag. 
2. Section through a sorus of teleutospores of same ; mag. 
3. Chain of aecidiospores of Coleosporium senecionis, Fries ; mag. 
4. Gymnosporangium clavariaeforme, Jacq., aecidium condition ; 
mag. 
5. Aecidiospore of same ; mag. 
6. Thick-walled, dark coloured form of teleutospore of same ; 
mag. 
7. Thin-walled, pale coloured form of teleutospore of same ; mag. 
8. Urocystis anemones, Pers., spore-balls, one germinating ; mag. 
9. Tilletia tritici, Bjerk., teleutospore germinating ; mag. 
10. Secondary spores of same, conjugating in pairs ; mag. 
11. Thecaphora hyalina, Fingerh., spore-ball, and two of its com¬ 
ponent spores free ; mag. 
12. Chrysomyxa pyrolae, Schroet., section through teleutospore 
sorus ; mag. 
13. Teleutospore of same germinating; mag. 
14. Ustilago vaillantii. Tub, showing origin of spores within the 
walls of the hyphae ; mag. 
15. Spores of same, some germinating and producing a promy¬ 
celium which becomes free from the spore, and then bears 
secondary spores ; mag. 
