3l6 YORKSHIRE NATURALISTS* UNION. 



2191. Peronospora Schleideni Ung. [P. Schleideniana 

 De By.]. 



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

 Fl.). Bingley (Fl. Skipt.). Elland Park Wood (Fl. Hx.). 



Mid W. — Airton ; Malham ; etc. (Lees' Fl.). Bolton 

 Woods (Fl. Skipt.). Dunnow ; Slaidburn (Exc. '96). 



Not uncommon on leaves of Allium ursinniii. 



2192. Peronospora Candida Fckl. 



Mid W. — ^lalhani, on primrose leaves (Lees' Fl.). 



2193. Peronospora sparsa Berk. 

 N.E. — Bulmer, on living rose leaves (Tr. iv.). 



SAPROLEGNIACE^. 

 SAPROLEGNIA. 



2194. Sappolegnia ferox Nees. "Salmon disease." 

 N.E. — Bulmer (Tr. iv.). Scarboro", on dead flies. 



S.W — Hainworth, amongst algee. Only too common in 

 some seasons, on salmon and other fish in some of our rivers 

 (Lees' Fl.). 



On dead flies, fish, newts, etc., in water. Causing the 



well-known and destructive salmon disease. Common. Empitsa 



musca Cohn, was at one time considered to be an imperfect 



aerial condition of the present species, but it is now known 



that the two are not in any way related (Mass. British Fungi 



(1891), p. 132). 



PYTHIUM Pringsh. 



2195. Pythium De-Baryanum Hesse. 



N.E. — Scarboro', on seedlings of garden Balsams. 

 S.W. — Halifax, on cultivated cress seedlings (Fl. Hx.). 

 ENTOMOPHTHORA CE^. 



EM PUS A Cohn. 



2196. Empusa muscse Cohn. 

 N.E. — Scarboro', on dead flies. 



S.W. — Halifax, common on house-flies. 



N.W. — Masham, enveloping a dead fly (' Nat.' Jan. '02). 



Common each year in Aug. & Sep. on house-flies — Miisca 

 domestica, and other dipterous insects. Best seen in the case 

 of the former, when attached to window panes, where the 



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



