ASCOMYCES. 15 



rounded, 40-50 x 10-13 //,, stein-cell 14-18 x 8 p.; spores 

 hyaline, continuous, smooth, 5 5-6 5 X 4-4 5 p. 



Exoascus pruni, Fckl., Enumer. PI. Nassov., p. 29; Winter, 

 Krypt.-Flora, Gymnoasceae, p. 5, fig. 3, p. 4 ; Sacc. Syll., 

 viii., n. 3342 ; Frank, Krankh. der Pflanzen, p. 524, fig. 89. 



Causing peculiar deformations on the young fruit of the 

 plum, sloe, and bird-cherry. 



Type specimen examined. 



Ascomyces bullatus. Berk., Intr. Crypt. Bot., p. 284, 

 fig. 66, c ; Phil., Brit. Disc., p. 401. 



Tufts at first small and isolated, soon running into each 

 other ; covered at first by the epidermis which is raised in 

 blisters ; asci narrowly clavate, 35-40 X 8-9 p., stem- cell 

 nearly cubical, about 8 //, across; spores variable, globose, 

 ovate' or broadly elliptical, hyaline, continuous, smooth, 4-5 ^ 

 diameter. 



Oidiwn bullatus, B. & Br., Journ. Hort. Soc., ix., p. 51, 

 with a fig. 



Exoascus bullatus, Fckl., Symb. Suppl. ii., p. 49 ; Sacc., 

 Syll., n, 3343 ; Winter, Krypt.-Flora, Gymno., p. 5. 



Forming blisters on living leaves of pear and hawthorn ; 

 spring. 



Type specimen examined. 



Ascomyces deformans. Berk., Intr. Crypt. Bot, 

 p. 284; Berk., Outl., p. 376, t. 1, fig. 9, A, B; Phil., Brit. 

 Disc., p. 401. (figs. 8, 9, p. 12.) 



Developing on the under surface of the leaf, and forming 

 scattered swollen places which become powdered with white 

 meal ; asci subcylindrical, 40-50 x 7-8 fj., stem-cell 12-16 /z. 

 long, up to 5 fji thick at the apex, and narrowing down- 

 wards; spores continuous, hyaline, elliptical, smooth, 7 x 

 3-4 /LU 



Exoascus deformans, Fuckel, Symb., p. 252 ; Winter, Krypt.- 

 Flora, Gymno., p. 6; Sasc., Syll., viii. n. 3341; Sadeb., 

 Exoasc., p. 114, fig. 19. 



Type specimen examined. 



Causing the disease known as " curl " in leaves of peach 

 and apricot; also forming the dense fasciculation of small 

 branches called "bird's nests" or "witches' besoms," in the 

 plum, cherry, and bird-cherry. 



