UXCIXULA 



97 



U. prunasirl has hitherto been recorded on a single host-plant, 

 Priuius spmosa. I have, however, found examples contained in 

 the Herbarium of the Upsala Museum, on P. pumila^ and have 

 also lately seen specimens growing on P, hisititia^ from France 

 (Bagneres de Bigorre, Pyrenees, 2000^ J. H. Burkill, Aug.. 1S99). 



There is a specimen, in Cooke's Herbarium, at Kew, labelled 

 '' U. Wallrothii, f, Loniccrae Xjlostei, M. Cerva. Belluno. 18 '* in 

 Professor Saccardo's handwriting. On the honeysuckle leav^es 

 there are certainly several jDerithecia of U. prunastri^ but there is 

 no evidence to show that these grew there. The perithecia appear 

 to be all merely entangled in the leaf-hairs, and not fixed, and on 

 the slight traces of mycelium present on the leaf I could find no 

 signs of young perithecia. 



Speschnew (338) records U. prunastri from Transcaucasia with 

 the following note. *' Le distingue du precedente \U, salicis^ par 

 6 spores dans chaque ascus et a ete trouve sur une espece de 

 Crataegus, au pare de Tzinondaly, en septembre." 



U, prunastri has been recorded from America, b}- E. C. Howe, 

 in Cooke and Peck's ** Erysiphei of the United States (91, p. 170), 

 by Bessey (40, p. 7), and in Farlow and Seymour's Host-Index 

 (125, p. 15), but the specimens referred to are all U. necator ; the 

 same is also the case with the specimen in Ravenel's Herbarium at 

 the British Museum (S. Kensington) labelled '* U. Wallrothii Lev. 

 on Ampdopsis, Pennsylvania, Dr. Michener, ex Curtis." 



4. U. CLANDESTINA (Biv. Bern.) Schroet. [Fig. 93] 



Erysiphc clandcsiina Biv. Bern. Stirp. Rar. Sic. man. 3 : 20. pL 



^./. /. 1815. 



AlphitomorpJia adunca^ var. nhnonim Wallr. Berk Ges. Nat. 

 Freund Verb, i: 37. 1819; Wallr. Fl. Crypt. Germ. 2 : 755. 



1833- 



Erysibe adunca, var. nhnorum Lk. in Willd. Sp. PL 6 : 112. 



1824; Rabenh. Krypt Fl. Deutschl. i : 236. 1844. 



Erysiphe adunca Fr. Syst. Myc. 3 : 245 (partim). 1S29. 



E. ulmi Czst, Cat. PL Mars. 192: 1845. 



E. adunca, var. tdmorum Dur. & Mont., FL d' Alger. (Crypt.) 



567: 1846-9. 



