Griffiths: Common Parasffe of Powdery Mildews 187 



Hosts examined 



Oldium cydoniac Pass, parasitic on Cydoidac vulgaris Pcrs. 

 Oidium erysipJioidcs Fr. {SpJiacrothcca Iiumnli (DC.) Burrill ?) 

 parasitic on Iliuimhis sp. 



Oidium Tuckcri Berk. {Uncimda nccator (Sclnv.) Burrill ?) par- 

 asitic on Vitis vinifera L. 



Sphacrothcca phytoptophila K. & S. parasitic on Ccltis occidcu- 

 talis L. 



Sphaerothcca Castagnci Lev. parasitic on Bidciis ccrmia L. 

 Conidial stage of Erysiphaceae, parasitic on Cynoglossum sp. 

 Erysiphe communis (Walk.) Fr. parasitic on Fisum sativum L. 

 Erysiphe cichoraccarum DC. parasitic on Grinddia squarrosa 

 Dounal and Lygodesvda ju)icca Don. 



SpJi 

 Epilobiujit. adoiocaulon Ilaus. 



laris Nutt. 



iffidt. 



Crataegus rivu- 



Rydb. 



Microphaera alni {\)Z) W'int. parasitic on Lonicera glauccsccns 



References 



Bot. 



Zeitung. 10 : 301, 1852; 11 : 16, 2-^6, 1853. DcBary, 

 A. Morphologic und Biologic der Pilze, 3 : <>z~7^, P^- 6, 7. De 

 Bary, A. Morphology and Biology of the Fungi, Mycetozoa and 

 Bacteria, 247, / up. Saccardo, P. A. Syll. Fung. 3 : 216, 10 • 

 220, II r 502. Flora, 35: 397. 1852. Schcnk, Handbuch der 

 Botanik 4: 324-327, 544. 1890. Ellis and Everhart, North 

 American Pyrenomycetes 3, 4, 1 892. Lcunis and Frank, Synopsis 

 der Pflanzenkunde, 3 : 353, / ^^. 1886. Tulasne, Select! Fung. 

 Carp. I. Oestr. Wochenb. 14 : 126-128, 1888. Revue Mycol. 12 : 

 7?,, 176, 1890; 15: 16, 69, 1893. Hedwigia, i : 23, 1852. 



EXSICCATI EXAMINED 



Roumegucrc. Fungi Selecti Galliae, nos. 6107, 6108, 5461, 

 6207, 6208. Sydow. Mycothcca Marchica, no. 1-537. Rabcn- 

 horst, Fungi Europae, no. 2215. Krieger, Fungi Saxon, no. 987. 

 Thuemen. Mycotheca Universalis, no. 1668. 



