NORTH A.M1:R1CAN parasitic EXOA8CE.E. n- 



This corresponded with that description in the occurrence of 

 asci upon both sides of the leaves and in those of the under 

 being rather larger and more slender than the asci on the 

 upper surface; }'et the essential characteristics were identical 

 with those of T. (wrulcsrciis. 



Taphrixa viRiiixicA Sdifchcck cf- Scy>uoiir.^ Plate III. 

 Fig. 3- 



This seems without doubt to be a species indigenous to 

 North America. It appears upon leaves of Ostrya virginica 

 collected at Temple, N. 11. and Wellesley, Mass.. by Mr. 

 Se}mour, and at Greencastle, Ind., by Prof. L. M. Under- 

 wood. The fungus bears several points of resemblance 

 to Exoascus fiirpiirascciis.. Ellis & Everhart. but in this in- 

 stance there is no perennial mycelium ramifying through the 

 host-tissues. 



The asci are upon both sides of the leaves, in form very 

 like that of E. piirpiirasrciis. some are almost dumb-bell 

 shaped, though the medial constriction is not so strongly 

 marked; at the lower extremities they are uniformly trun- 

 cated, the upper may be the same, yet in some instances they 

 are rounded and of much less diameter. The spores are 

 rather large and ball-shaped, but before their release from the 

 asci divide into numerous conidia. 



Taphrina ulmi {Eiickcl) yohanson. Plate IV. Fig. 3. 

 Bibl. and S3'n. : 

 Exoasciis II I mi Fuck el. 



Sadebeck '84. 



^ I base collected tbis form in ciiiantitv in se\"eral localities and compared 

 tbe material witb all available descriptions and antbentic specimens, bnt 

 find it like none of tbem. More recently at m^- request Mrs. Patterson bas 

 sent it to Professor Sadebeck, who also thinks it undescribed. He proposes 

 the name Tap/irina virgiiiiai, Seymour & Sadebeck, but as his name is pre- 

 eminent in connection w itb this <^roiip, I take the liberty- of suggesting the 

 above form. A. B. Seymour. 



