42 . Bulletin 313 



Phyllachora gramixis (Pers.) Fcl. — On leaves of grasses and 



sedges. Stroma variable in size but causing small, conspicuous 



black spots. Conidia unknown. Perithecia immersed and ostio- 



late ; asci cylindric and with short pedicles, 70-80 x 7-8 fx ; asco- 



spores, hyaline, ovoid, obliquely uniseriate, 8-12 x 4-5 fi; paraphyses 



filiform. 



171. Infected blade of grass. 172. Cross-section of stroma showing peri- 

 thecia, 2/3. 173. Ascus. 174. Ascospores, 1/12. 



Phyllachora trifolii (Pers.) Fcl. (= Polythrincium trifolii 



Kze., page 122). — On the leaves of clovers. Causes small black 



spots of 1 mm. or less. Conidiophores (Polythrincium trifolii) 



wavy, erect, simple and black; conidia obovate, 1-septate slightly 



constricted, pale, olivaceous, 20-24 x 9-10 /x; ascospore stage rare; 



asci 8-10 X 5-6 ft. 



175. Infected clover leaf. 176. Conidiophores and conidia, 1/12. 177. 

 Conidia, 1/12. 



AcANTHORYNCHUs VACCiNii Shear. — On the cranber^)^ My- 

 celium in leaves and fruit without necessarily producing a rot. Rot 

 frequently appearing after putting fruit in storage. Rot light brown 

 to chocolate-colored, more solid than the scald rot. Perithecia scat- 

 tered on decaying leaves, never on green leaves, rarely found on 

 fruit, subglobose to flask-shaped, 120-200 ix in diameter, submem- 

 braneous, the stout neck projecting and more or less covered with 

 spines measuring 50-70 x 8-9 fi; asci subelliptic to clavate, pale, 

 brownish-yellow, surrounded by a mucilaginous layer of protoplasm, 

 24-32 X 12-18 /i. 



178. Perithecium from culture, 2/3. 179. Tips of perithecia, 2/3. 180. Im- 

 mature ascus, ascospores and paraphj'ses, 1/6. 181. Mature ascus, 1/12. 182. 

 Mature ascospores, 1/12. 



GuiGNARDiA .EscuLi* (Pk.) Stewart (= Phyllosticta pavur 



Desm., page 68). — On the leaves and sometimes on the immature 



fruits of horse-chestnut {Aesculus liippocastanum) and the buckeye 



{Ae. glabra). Causes large, irregular dry brown or dark red 



blotches with indefinite yellow borders. Pycnidia globose, black, 



90-175 fi; conidia oval 10-16 x 6.5-10 fx; spermagonia with minute 



hyaline spores; asci clavate 54-70 x 15-17 /x or larger when wet; 



ascospores subelliptical, uninucleate, granular, 12-18 x 7-9 fx. 



183. Pj-cnidium, 2/3. 184. Conidia, 1/12. 185. Ascus, 1/12. 186. Asco- 

 spores, 1/12. 



*Svn. Lcpstadia cesculi. 



