OVULARIA. 501 



O. alnicola (Cke.). On A/nus glutinosa. 

 O. scelerata (Cke.). On Itammculus sceleratus. 



O. rosea (Fuck.) produces irregular brown spots on the leaves of 

 vaiidus s])ecies of willow. 



O. asperifolii (Saec). On Symphytum officinfdis. 



O. veronicae (Fuck.). On spots on leaves of Veronica Chamaedrtjs, etc. 



O. lamii (Fuck.). (Jn Lamium. 



O. syringae (Berk.). On Syringa. 



O. sphaeroidea Sacc. causes spots on leaves of Lotus. 



O. carneola Sacc. On spots on leaves of Scrophularia nodosa. 



O. bistortae (Fuck.). On spots on leaves of Polygonum Bistorts. 



O. obliqua (Cke.). On leaves of Rumec. 



•>. Sect. Didyjiosporae. 



Didymaria. 



Conidia two-celled, colourless, and produced singly at the 

 extremity of simple erect conidiophores. 



Didymaria prunicola Cav. Cavara states that this causes 

 rai.st'd roundish spots on the upper surface of leaves of plum ; 

 finally the leaves gradually dry up and fall oft'. Slender two- 

 celled conidiophores are produced, and give off each a two-celled 

 obovoid conidium. 



D. Ungeri Cord. On living leaves of Ranunculus repens. (Britain.) 

 D. astragali (Ell. et Hoi.). Found on leaves of Astragalus canadensis. 

 D. spissa Hark. On lea\o.s of Solidago occident'dis ; both species in 

 North America. 



Bostrichonema. 



Conidiophores erect, spirally twisted, unbranched, and non- 

 septate. Conidia elliptic or oblong, two-celled, and hyaline. 



Bostrichonema alpestre Ces. On living leaves of Polygonum 

 virlparii III and 1'. lli^tvrla. (Britain.) 



B. modestum (T.. et 15. Wliite). On leaves of Alrlirmilla 

 (ilpiua. (Ihilain.) 



?,. SkCT. rHRAG.MiiSI'Ull.\E. 



Ramularia. 



Conidiophores emerging in tufts from the stomata ; they give 

 off a terminal conidium, then bend over and produce a lateral 

 conidium, and so on they branch in a sympodial manner, pro- 



