〃 238. Conceptacle of Pea blight (_Erysiphe Martii_) × 80. 〃 239. Sporangium of _Erysiphe Martii_ × highly. 〃 240. Conceptacle of Buttercup blight (_Erysiphe communis_) × 80. 〃 241. Sporangium of _Erysiphe communis_ × highly. 〃 242. Sucker from the mycelium of _Erysiphe communis_, magnified. XII. 243. Conceptacle of Mealy Guelder-rose blight (_Microsphæria Hedwigii_) × 80. 〃 244. Sporangium of same, containing spores, × highly. 〃 245. Conceptacle of Cornel blight (_Erysiphe tortilis_) × 80. 〃 246. Sporangium of same, containing spores, × highly. 〃 247. Tip of appendage of _Microsphæria Hedwigii_ × highly. 〃 248. Sporangium of Mugwort blight (_Erysiphe Linkii_), containing spores, × highly. 〃 249. Conceptacle of Mugwort blight (_Erysiphe Linkii_) × 80. 〃 250. Sporangium and spores of Plantain blight (_Erysiphe lamprocarpa_) × highly. 〃 251. Conceptacle of Plantain blight (_Erysiphe lamprocarpa_) × 80. 〃 252. Conceptacle of Paper bristle-mould (_Chætomium chartarum_) magnified. 〃 253. Sporidium of the same, further magnified. 〃 254. Conceptacle of Paper mildew (_Ascotricha chartarum_) magnified (_Berkeley_). 〃 255. Portion of thread of same with conidia, further magnified (_Berkeley_). 〃 256. Sporangium of same, containing spores (_Berkeley_). 〃 257. Piece of straw with Bristle mould (_Chætomium elatum_). 〃 258. Conceptacle of same, slightly magnified. 〃 259. Section of same, further magnified. 〃 260. Dead leaf over-run with Herbarium mildew (_Eurotium herbariorum_). 〃 261. Conceptacles of the same, seated on their mycelium, magnified. XIII. 262. Fertile thread of Turnip mould (_Peronospora parasitica_). 〃 263. Fertile thread of Onion mould (_Peronospora Schleideniana_). XIV. 264. Fertile thread of Potato mould (_Peronospora infestans_). 〃 265. Fertile thread of Lettuce mould (_Peronospora gangliformis_). XV. 266. Fertile thread of Pea mould (_Peronospora Viciæ_). 〃 267. Fertile thread of Anemone mould (_Peronospora curta_). XVI. 268. Fertile thread of Sandwort mould (_Peronospora arenariæ_). 〃 269. Fertile thread of Dock mould (_Peronospora obliqua_) × 320. ------------------------------------------------------------------------