373 
number of new Species came to light when the critical study was 
made. This paper, which is now in press, will present numerous 
illustrations both of the deformities caused by these fungi in their 
hosts and of the structure of the various species of the parasites. 
It has seemed advisable to present in the BULLETIN some notes 
on these species, with descriptions of those which are con-' 
sidered new. [| anticipate there will be some criticism of 
the disposition which I have made of certain forms, and 
I beg those who feel thus disposed to withhold a final judg- 
ment until the illustrated paper shall appear. There will be given 
a fuller discussion of the grounds for this arrangement, as well as 
careful camera lucida drawings, all to the same scale, so that a 
better defense of my position will then appear than could possibly 
be given in these notes. 
Exoascus DEFORMANS (Berk.) Fuckel. 
In the arrangement which I have proposed of. the forms.o¢- 
curring on’ leaves this species occurs only on the leaves and 
shoots of the peach, Amygdalus Persica. 
Exoascus Prunt Fuckel. 
Exoascus Pruni, as I understand it from the material at hand, oc- 
“urs only on the fruit of Prunus domestica 1. in the United States. 
Exoascus insrrrrra: Sadebeck. : 
To this species I would refer the specimens collected by Sey- 
_Mour at Temple, N. H., June 16, 1888, on the leaves of Prunus 
Pennsylvanica L. See Seymour and Earle, Economic Fungi, no. 
15. The specimens to which I have had access show several small 
twigs curved to one side growing from the end of a larger one. 
© twig has very much the appearance of a small “ Witches’ 
Broom.” The young twigs are pale and slender, the leaves 
‘lightly and finely folded or wrinkled, and the under surface is 
Steyish-white in color from the asci. These characters, together 
with the size of the asci and the relative size of the asci and stalk- _ 
cells agree, it seems to me, with Sadebeck’s* species as he de- 
Scribes it on Prugys insititia L. and P. demestica L. 
* Unters. u. d, Pilzgattung Z.roascus, ete. Ab. a. d. Jahrb. d. Hamb. Wiss. 
Anst,, TI3. 1884. 
Kritische Unters. u, d. durch Taphrina-Arten, etc. Ibid, 8: 27. 1891. 
Die parasiten Exoasceen, Ibid, 10: 2, 48 1893. ees 
