62 Bulletin 313 



B0TRYOSPH.ERIA RiBis G. & D. (= Dothiorella sp., page 76). — 

 On the canes of the currants. Causes a dying back or blight. 

 Pycnidia compound, pycnospores fusoid, non-septate, hyahne, 18-31 

 X 4.5-8 IX.. Perithecia somewhat cone-shaped, papillate, ostiolate, 

 interspersed among the pycnidia, 175-250 (i; asci clavate, 80-120 x 

 17-20 fx; numerous filiform paraphyses; ascospores fusoid, non- 

 septate, hyaline, 16-23 x 5-7 [x. 



302. Twig of currant showing pycnidia. 303. Same enlarged. 304. Cross- 

 section of stroma showing pycnidia, 2/3. 305. Pycnospores, 1/12. 306. Cross- 

 section of stroma showing perithecia, 2/3. 307. Ascus, 1/12. 308. Ascospores, 

 1/12. 



Phyllosticta acericola C. & E. — On the leaves of the maples. 



Causes irregular, brown-margined spots which frequently unite to 



form blotches. Pycnidia rather abundant in the central part of the 



spot; subepidermal, flask-shaped, dark brown, measuring 120 ju.; 



conidia ovate, 8-0 x 5-6 //.. 



309. Infected maple leaf. 310. Pycnidia, 2/3. 311. Spores, 1/12. 



Phyllosticta alliari^foli^ Allesch. — On the leaves of cul- 

 tivated Campanula. Causes more or less circular, angular, ashy- 

 colored spots with obscure margins, 4-12 mm. in diameter. Pycnidia 

 lenticular, erumpent, dark ; spores ovoid or oblong, small non-sep- 

 tate, hyaline, 4-6 x 2-3 [x. 



312. Spores, 1/12. 



Phyllosticta ampelopsidis E. & M. — On Virginia creeper 

 {Ampelopsis quinquefolia) , causing leaf spots. It is probably 

 identical with P. lahruscae Thiim. of the grape, which is an imper- 

 fect stage of Giiignardia bidwellii (page 44). 



313. Infected leaflet of Ampelopsis quinquefolia. 314. Infected leaf of 

 Ampelopsis tricnspidaia. 315. Spore, 1/12. 



Phyllosticta aristolochi^ F. Tassi. — On the leaves of Aristo- 

 lochia. Causes more or less circular, or irregular dirty white leaf 

 spots surrounded by a thin brown border. Pycnidia small lenticular, 

 densely scattered, 50-60 fx in diameter ; spores ovate or elliptical, 

 hyaline, non-septate, 3-6 x 2-2.8 /x. 



316. Infected leaf of Aristolochia macrophylla. 317. Spores, 1/12. 



Phyllosticta auerswaldii Allesch. — On the leaves of Buxu.s' 

 sempervirens. Causes white leaf spots with indistinct margins. 

 Pycnidia on both surfaces, few, sometimes many, ostiolate light 

 brown ; spores ovoid or oblong, non-septate, hyaline, 5-7 x 3-4 fx. 



318. Pycnidia. 2/3. 319. Spores, 1/12. 



