REVISION OK THE SCOTCH I'ERlSrOUIACEAE. 17 



and 5^. vitellina, near Paris ; easily known by the very 

 lon^ appendages. 



Uncinula Bivonae Lev., on Ulmus campestrls, in 

 France and Germany. 



U. Tulasnei Fnckel, on Acer platanoides, near the 

 Rhine. 



Microsphaera Liycii (Lasch.) Sacc. and Roum., on 

 LyciiLin eia-opaeiim, in England, Central Europe, and 

 North America. 



M. Dubyi Lev., on Lonicera sps., in Belgium, 

 France, Italy, and America. 



M. divaricata (Wallr.) Lev., on Rhamnus Frangiila, 

 in Western Europe. 



M. Euonymi (D.C.) Sacc, on Euonymus europaeus, 

 in England, and in Western and Central Europe. 



Erysiphe tortilis (Wallr.) Fr., on Cornus san guinea, 

 in England, and on the European continent. 



Oidium Tuckeri Berk., on Vitis vinifera, too com- 

 mon in England and elsewhere. 



Many American species of the family have been 

 described, and of these some may occur in Scotland; 

 but it wovdd be making the circle too wide for my 

 present object to mention these also. 



Sub-family IL PERISPORIEAE. 



This group is readily distinguished from the former 

 by the absence of the white mj^celium. Instead of 

 this the perithecia are not infrequentlj' distributed 

 on a blackish mycelium, resembling Torula or SjJoi'i- 

 desmium. Some of the sj)ecies are saprophytes, 

 others are parasites. 



Genus 7. Anixia ? Fries. 



22. A perichaenoides (Cooke) Sacc. {Orbicula peri- 

 chaenoides Cke., M.S. 1823) (D- Keith),— On an old 

 fir beam at Forres. 



Moray. 



It is recorded as growing on dead cabbage stalks, 

 rotten straw, &c., in Germany. 



