PLATE 1. 



Erysipheae. 



Sphaerotheca Castagnei. Lev. 

 Fiir. 1. Natural size on the leaf. 



o 



2. A group slightly magnified. 



3. A conidiophore bearing three conidia, with one at the base 



germinating, the germ tube entering one of the stomata 

 of the leaf. 



4. A perithecium having one of the appendages bifid at the 



tip. 



5. Perithecium with the single 8-sporcd ascus escaping. 



6. Four sporidia. 



NOTE. 



Figures on Plates i, 2, 3, 4, 6, 9, n, 13, 14. 15, iS, 21, not drawn to any scale. 



