44 Bulletin 313 



GuiGNARDiA BiDWELLi (E.) V. & R. — On berrics, leaves and 

 stem of grapes. Causes rotting of tlie fruit, spots on leaves, stems 

 and tendrils. The conidia (Phyllosticta lahrusccE Tliiim., page 66) 

 on leaves (Phoma uvicola, page 72), on stems and tendrils, borne 

 in numerous black, papillse-like pycnidia 180 x 180 ix, subepidermal, 

 elliptic, thick-walled; ccnidiophores, short, simple; conidia ovate to 

 elliptic 8-10 x 7-8 ix. Filiform microconidia ("spermatic") in flask- 

 shaped pycnidia, 0.1-0.2 x 0.45-0.46 /j.. The perithecia develop on 

 the old berries, are minute, globose, subepidermal, erumpent and 

 perforate; the asci clavate-cylindrical, obtuse, 60-70 x 10-13 ii; 

 spores spindle-shaped, 12-17 x 4.5-5 /<,. 



This very destructive rot disease appears on fruit when the ber- 

 ries are about two-thirds grown as well-defined circular purplish or 

 brown spots which gradually spread. The rotten berries dry and 

 become wrinkled. Appear very much like Melanconium fuliginiiim 

 (page 110). 



187. Infected grapes. 188. Pj'cnidium, 2/3. 189. Large and small pycni- 

 diospores, 1/12. 190. Ascus, 1/12. 191. Ascospores, 1/12. 



GuiGNARDiA VACCiNii Shear. — On the leaves, flowers and fruits 

 of the cranberry; causing a rotting of the fruits and a spotting of 

 the leaves. The conidia (Phyllosticta stage) formed in pycnidia, 

 100-120 fx; conidia hyaline, obvoid, 10.5-13.5 x 5-6 fi. The peri- 

 thecia on the young fruits or flowers are subepidermal globose, and 

 with thick walls ; asci clavate, cylindrical, short stipitate, 60-80 fx 

 and 8-spored; ascospores hyaline and spindle-shaped. No para- 

 physes. 



192. Infected berries. 193. Pj'cnospores, 1/12. 194. Pycnospores with ap- 

 pendages, 1/12. 195. Asci in various sfages of development, 1/12. 196. Asco- 

 spore, 1/12. 



Mycosph^rella fragari^ (Tul.) Lin. (= Ramularia tidasnei 

 Sacc, page 120). 



Mycosph^rella lethalis Stone (= Ascochyta lethalisK. &'E., 

 page 82). 



Mycospii^rella rosigena E. & E. — On the leaves of the rose. 

 Causes reddish-brown, purple-bordered spots about 3 mm. in diame- 

 ter; perithecia abundant, minute, 60-75 fi, partly erumpent, black; 

 asci subclavate to oblong, 25-30 x 8-10 fx; spores bi-seriate, clavate- 

 oblong, end subacute, hyaline, 1-septate, 10-12 x 2 /x. 



197. Infected leaf of rose. 198. Perithecia, 2/3. 199. Ostiolum of perithe- 

 cium, 1/6. 200. Asci in various stages. 201. Ascospores, 1/12. 



Mycosph^rella pinoides B. & B. (= Ascochyta pisi Lib., page 

 82). 



