it 



PLATE 1. 



Mrysipbeae. 



Sphaerotheca Castagnei, Lev. 

 Fig. 1. Natural size on the leaf. 



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 s.poridia. 



Note. 

 Figures on Plates i, i, 3, 4, 6, g, 11, 13, 14. 15, i3, 21, not drawn to any scale. 



