44 Bulletin 313 



GuiGNARDiA BiDWELLi (E.) V. & R. — Oil bcmes, leaves and 

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

 and tendrils. The conidia {Phyllosticta lahruscce Thiim., page 66) 

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

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

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

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

 shaped p)'-cnidia, 0.1-0.2 x 0.45-0.46 /x. The perithecia develop on 

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

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

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



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 fidiginium 

 (page 110). 



187. Infected grapes. 188. P)^cnidium, 2./2. 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 oi 

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

 100-120 fi; 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 fi 

 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 stages of development, 1/12. 196. Asco- 

 spore, 1/12. 



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

 Sacc, page 120). 



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

 page 82). 



Mycqsph^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 /x, partly erumpent, black; 

 asci subclavate to oblong, 25-30 x 8-10 fi; 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). 



