Leaf Curl and Plum Pockets. 337 



Prunus hortulana L- H.. Bailey. 

 Exoascus mirabilis. Atkinson. 



The buds and ends of the branches of P. hortulana are affected 

 exactly like those of P. aiigustifolia , and the fungus seems to be 

 identical with the species on that plant. All of the specimens 

 were communicated to me by Prof. Pammel. Some of the de- 

 tails of the asci, etc., are illustrated as follows. Fig. 70 from 

 specimens collected at Ames, Iowa, in May, 1894; fig. 72 from 

 specimens collected by Dr. A. B. Dennis at Cedar Rapids, la., 

 May, 1894. These specimens which I examined were rather 

 young and comparatively few of the asci were fully developed. 

 Fig. 68 is from specimens collected by Mrs. R. M. Kellum, at 

 Salem, la., June 8, 1894. In this specimen the asci and stalk 

 cells were much longer than in any of the other specimens, though 

 the relative proportions between the asci and stalk cells remain 

 about the same. This specimen was marked ''Prunus chicasa, 

 'Wild Goose Plum.' " Prof. Bailey has determined it as P. hor- 

 tulana. 



Figs 70 and 72 agree in all respects with the type. 



Fig. 7 1 represents the asci and the relation of the fruit struc- 

 tures to the epidermal cells in specimens from the buds of Pni?ius 

 hortulana var. vtineri, also from Iowa, collected by A. Noe, in 

 May, 1894. These also agree with the type on P. angtistifolia . 



Prunus Americana Marshall. Wild Red Plum. 

 . Exoascus longipes n. sp. 

 The specimens which constitute the type of this new species 

 were collected at Danby, N. Y., by T. A. Mandeville. A photo- 

 graph of the twig bearing numerous "bladders" and a normal 

 fruit is reproduced in fig. 3, Plate II. The hypertrophied fruits 

 are irregularly long ovate and sometimes slightly curved. The 

 fungus is quite different from any of this class described hitherto 

 on the fruits of Priini. It is characterized chiefly by the very 

 long stalk cells and from the circumstance that they intrude them- 

 selves prominently between the cells of the epidermis. The asci 

 are slightly clavate and rounded or somewhat truncate at the free 

 end. They are 30-40 long by 7-10 in diameter. The stalk cells 

 are 25-35 high by 3-5 in diameter, being usually much narrower 



