3^4 VORKSHIRK NATURALISTS UNION. 



PHYTOPHTHORA De By. 



2176. Phytophthora infestans De By. [Peronospora.]. 

 Only too common on leaves of the potato in every district, 



causing the well-known potato disease. 



(Mass. Text-Book of Plant Diseases, pp. 62-65, ^g- 7)- 

 PLASMOPARA Schroet. 



2177. Plasmopara pygmaea Schroet. [Peronospora.]. 

 S.W . — Bingley ; Saltaire ; on leaves of Anemone nemorosa in 



woods, common (Lees' Fl.). 



217$. Plasmopara nivea Schroet. [Peronospora. Ung.]. 



N.E. — Scarboro', on leaves of Anthrisciis syJvestris. 



Mid W. — Malham, on leaves oiChccrophylhim sylvestre = A. 

 sylvestris, and other Umbelliferae (Lees' Fl.). Eshok, on 

 A. sylvestris (J. E. Sutcliffe). 



S.W. — Saltaire (Lees' FL). Hebden Bridge, on similar host 

 plant (Fl. Hx.). 



(Mass. British Fungi (1891), p. 113, pi. iv. figs. 66-70). 



2179. Plasmopara densa Schroet. 



Mid W. — Cocket Moss, Giggleswick, on Rhinanthns Crista- 

 gain (' Nat.' Aug. '03). The first record of this rather 

 uncommon parasitic mould occurring on Rhinantlnis : its 

 hosts hitherto recorded in Britain are Euphrasia officinalis, and 

 Bartsia Odontites. 



2180. Plasmopara pusilla Schroet. 



Mid W. — Embsay, near Skipton ; and Esholt, on Geranium 



pratense (' Nat.' Aug. '03) ; not previously recorded for Great 



Britain, 



PERONOSPORA Corda. 



2181. Peronospora vicise De By. 



N.E. — Bulmer (Tr. iv.). Scarboro', on Viccia Cracca. 



2182. Peronospora arenariae Tul. 



S.\\'.— Roche Abbey (Lees' Fl.). Bingley (Fl. Skipt.). 

 N.W. — Masham, on Cerastium triviale (* Nat.' May '03). 



2183. Peronospora parasitica De By. 

 N.E. — Scarboro', on cultivated wallflower. 



S.W. — Anston Stones (' Nat.' June '85). Newsholme 



Trans. Y.N.U., 1905 (pub. 1905). Bot. Series, Vol. 6. 



