ASCOMYCES. 15 



rounded, 40-50 x 10-13 fx, stem-cell 14-18 X 8 /x; spores 

 hyaline, continuous, smooth, 5*5-6*5 X 4-4*5 /x. 



Exoascus pruni, FckL, Enuiner. PI. Xassov., p. 29 ; Winter, 

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

 viii., n. o342 ; Frank, Krankh. der Pnanzen, 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. Q6, 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 fx, stem-cell 

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

 ovate or broadly elliptical, hyaline, continuous, smooth, 4—5 \x 

 diameter. 



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

 with a fig. 



Exoascus bullatus, FckL, Symb. SnppL 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 /x, stem-cell 12-16 jx 

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

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

 3-4 fx. 



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

 Flora, Gymno., p. 6; Sacc, 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. 



