REVISION OF THE SCOTCH PKRISPOUIACKAE. 13 



Vicia Cracca ! V. sylvatlca ! Lathyrus pratensis ! and 

 also on Hypericum hirsatiim ! in summer and autumn. 



Forth, Clyde ! Taj^ ! Dee ! Moray ! Ross. 

 England, Europe, Siberia, N. America. 



10. E. UmbeUiferarum De Bary {Scot Nat 1886, 

 p. 229) (D. and R. 2\a'd). — On leaves of various 

 Umbelliferae, e.g., Heracleum Sphondyllum (abun- 

 dantly)! Anthrlscus sylvefitris\ Angelica sylvestrisl 

 and Pimpinella Saxifraga I in summer and autumn. 



Clyde ! Tay ! Dee ! Moray ! 

 Europe. 



This Erysiphe is very like E. Martii, with which it is 

 probably confounded in the Myc. Scot., if we may judge from 

 H. Sphondyliuni being named as a host of the latter ; but it 

 differs from that species in pi'oducing cylindrical (not elliptical) 

 conidia, perithecial appendages brown at their base, and usually 

 only from 2 to 4 (rarely 6) sporidia in each ascus, instead of from 4 

 to 8 in each, as in E. 3Iartil. 



11. E. graminis DC. (M.S. 1837).— On leaves of 

 various grasses. It is especially partial vi^ith us to 

 Agropyruin repensl Arrhenatherimi avenaceiaul Poa 

 pratensis ! P. trivtalis ! and Festuca gigantea ! 



Tweed, Forth, Clyde ! Tay ! Argyle ! Dee ! Moray ! 

 Eoss, Orkney ! 



England, Europe, Asia, N. America, Australia. 



The conidial condition (Oidiicm monilioides) is extremely 

 •common, and often seriously injures the infested plants ; but 

 the perithecia are far less frequently observed, as they are 

 usually late in appearing, and as a rule contain sijoridia only 

 in spring. 



12. E. communis (Wallr.) Fries (M.S. 1842).— On 

 leaves of lianuncultis repens \ and of R. acris\ (and 

 of Leguminosae, fide M.S.). 



Tweed, Forth, Clyde ! Tay ! Argyle ! Dee ! Moray, 

 Orkney ! 



England, Europe, Asia, N. America. 



13. E. Galeopsidis DC. {Scot Nat 1886, p. 229) 

 {D. and R. Trail).~On Stachys sylvatical S. p)Cilustris\ 

 Galeopsis Tetrahii I Lamium album ! L. intermedium ! 



