258 Explanation of Plates. 



PLATE XLVIII. 



[All Figures x 500 unless otherwise sta'ed.) 



TILLETIA. 

 Fig. 



163. Spores of T. Levis. 



164, 165. Grerminating spores of same. 



16(5. Conidia of same germinating and producing secondary sickle-shape conidia. 



167. Coalesced conidia of same germinating and producing long threads. 



168. Germinating spore of same with elongated septate promycelinm and abnormally 



short conidia. 



16!:). Spores of T. tritici, surface view . . . . . . . . . . x 250 



170. Spores of same, sectional view . . . . . . . . . . x 250 



