EXPLANATION OP PLATES. 251 



Plate flK. 



IX. 191. Portion of Sallow leaf with Willow wedge-rast {Me- 

 lampsora salicind). 

 „ 192. Winter spores of Melampsora salicina x 460. 

 „ 193. Leaves of Spurge with Spurge wedge-rust (.M5?aOTjt).?orffl 



„ 194. Winter spores of Melampsora Euphorbiis x highly. 



„ 195. Portion of Poplar-leaf with Poplar wedge-rust (Ms- 

 lampsora populina) . 



„ 196. Winter spores of Melampsora populina x 460. 



„ 197. Winter spores of Melampsora betulina in active ger- 

 mination — a sporidia x 466 (Tulasne). 



X. 198. Eruit of Shepherd's Purse with White rust {Cystopus 

 candiius). 



„ 199. Portionof Cabbage-leaf with White rust ((^i^ojOTM caM- 



200. Conidia of White rust {Cystopits eandidus) x 360. 



201. Portion of Goatsbeard-leaf with White rust {Cystopm 



eubicus) . 



202. Conidia of Goatsbeard white rust (Oystopus eubicus) 



x360. 



203. Portion of Mycelium producing the first of a chain of 



conidia x 400. 



204. Mycelium of White rust with sucker-like processes 



x360. 



205. Mycelium of White rust with nascent oogonia x 360. 



206. Oogonium of Cruoifer white rust (Cystopus eandidus) 



xM)0{DeBary). 



207. The same, further advanced, ruptured, with zoospores, 



x400. 



208. Pree zoospores of White rust, with their cilise, x 400 



{DeBarp). 



209. Resting zoospores in germination x 400 {De Sary). 



210. Oogonium of Goatsbeard white rust (Cystopus eubicus) 



x4W{I)eBary). 



211. Oogonium of Sandwort mould {Peronospora arenariee) 



x400{DeSary). 



212. Oogonium of Pea mould {Peronospora meia) x 400 {Se 



„ 213. Oogonium of Veronica mould (Peronospora grisea) 



x4,00(I)eBary). 

 „ 214. Oogonium of Spinach mould (Peronospora effusa) x 400 



(Be Bary). 

 ,, 215. Leaf of Goosefoot with mould (Peronospora effusa). 

 Xl. 216. Conceptacle of Hop mildew (Sphsrotheca castaiine\i 



X 80. • 



„ 217. Conceptacle of Rose blight (Spharoi/ieca panaosa) x 80. 

 „ 218. Sporangium of Sphcerotheea pannosa x highly. 



