330 Bulletin 73. 



in proportion to their length than those described by Sadebeck. 

 I have seen specimens probably of this species on Prjinus domestica 

 in North, and South Carolina, but unfortunately did not preserve 

 any of them. 



The shoots of Primus domestica are sometimes deformed and 

 enlarged bearing mature asci, the structure somewhat resem- 

 bling that on the twigs of Prumis ayigustifolia Marshall. Prof. 

 Halsted sent me some specimens collected at Manalapan, N. J. 

 They are very old and overrun by some species of Gloeosporium 

 so that it is not safe, it seems to me to attempt to decide what the 

 species is. Some of the asci are illustrated in fig. 69. 



Prunus serotina Ehrhart. Black Wild Cherry. 

 Exoascus farlowii Sadebeck. 



The ovaries of Prumis serotina are deformed by this species, 

 the fruit becoming a spongy mass of tissue which is hollow within 

 much as in the case of the fruit of P. domestica when affected by 

 E. pruni. The ovaries are proportionately much more elongated, 

 spindle shaped and curved, the end usually tapering to a long 

 point. The floral envelopes are also hypertrophied and become 

 persistent, which is not the case with E. pruni on the fruit of 

 P. domestica. 



The species was first described by Sadebeck'-^ in 1890, from 

 material collected by Dr. Farlow at Cambridge, Mass. In the 

 material which Sadebeck examined he found the asci not crowded, 

 but separated firom each other, and this peculiarity, along with 

 characters of the ascus and stalk cells, caused him to separate it 

 from E. pruni, to which it had doubtfully been referred. f The 

 distant asci, especiall}^ in the material examined by myself, does 

 not seem to be a constant character, or even a frequent one, and 

 I have examined quantities of material from Alabama, some from 

 Canada, and some from Cambridge, collected by Dr. Farlow, and 

 also by Halsted. The characters given by Sadebeck must then 



* Kritische Unters. ii. d. durch Taphrina-Arten, etc. Ab. a. d. Jahrb. d. 

 Hamb. Wiss. Anst. VIII, p. 30, 189 1. See also Die parasiten Exoasceen, 

 Ibid, X, 2, p. 47, 1893. 



t Robinson, Notes on the ' genus Taphrina, Ann. Bot. I, p. 167, 1887-8 

 Ellis' N. A. F. No. 298. Here it is called E. pruni. 



