62 Bulletin 313 



BoTRYOSPH^RiA RiBis G. & D. (^ DotJiiorella sp.. page 76). — 

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

 Pycnidia compound, p3-cnospores fusoid, non-septate, h3-aline, 18-31 

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

 interspersed among the pycnidia, 175-250 /j.; asci clavate, 80-120 x 

 17-20 /i; numerous fihform paraphyses ; ascospores fusoid, non- 

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



302. Twig of currant showng 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 n; 



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



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, ermnpent, dark : spores ovoid or oblong, small non-sep- 

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



312. Spores, 1/12. 



Phyllostict.a. AMPELOPsmis E. & M. — On \*irginia creeper 

 {Avipelopsis qiiinquefolui) , causing leaf spots. It is probably 

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

 fect stage of Giiignardia bidtvellii (page 44). 



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

 Ampelopsis triciispidaia. 315. Spore, 1/12. 



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

 lochia. Causes more or less circular, or irregular dirt\' white leaf 

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

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

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



316. Infected leaf of Arisiolochia niacrophylla. 317. Spores, 1/12. 



Phyllosticta auerswaldii Allesch. — On the leaves of Buxus 

 sempei-z'irens. 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 /x. 



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





