1 68 Robinson.— Notes on the Genus Taphrina. 
and slightly tapering below. On P. domestica nearly all the 
asci examined have been more slender in proportion to their 
length than those described by Sadebeck. Furthermore 
there appears to be a sort of dimorphism among them, 
such as Johanson describes in the asci of T. alnitorqua ; for, 
beside the long and very slender ones, which are usually 
octosporic at maturity, there are others, more often polysporic, 
which are considerably shorter and thicker. In length the 
slender asci vary from 43 /x to 60 /x and in thickness from 
5i /x to 7 /x, while the asci of the stouter kind are 27-35 /x 
in length and 9-12 /x in thickness. The stalk-cells are 12-18 [x 
long and 5-8 [x thick ; they rest upon the epidermis, but do 
not intrude between the cells. The nearly spherical spores 
are normally eight with a diameter of 3-45 /x, but become 
much more numerous and smaller by division. 
T. DEFORMANS (Berk.), Tul. 
Ascomyces deformans , Berk., Outlines of British Fungo- 
logy, p- 37*5. 
Ascosporium deformans , Berk., ibid., in description of 
plate I. 
Exoascus deformans ) Fuck el, Ennumeratio Fungorum 
Nassoviae. 
Exoascus Wiesneri , Rathay, in Oesterreichische Botan- 
ische Zeitschrift, Jahrgang xxx, No. 7, p. 225. 
The ordinary form of this species occurs upon peach-trees, 
and causes the crisping and wrinkling of the leaves known 
as the ‘ peach-curl.’ On infection by the parasite, the leaves 
not only are distorted but become much thickened and take 
on a sort of cartilaginous structure. The asci are borne on 
both sides of the leaf, but in greater numbers upon the lower 
surface. Although the material which I examined was shown 
by the perfection of the spores to be mature, the asci were 
considerably shorter than those described by Sadebeck. The 
measurements were as follows : length of asci 26-32 ix, thick- 
ness 6-10 [x ; height of stalk-cell 9-12 /x, mean thickness 
3i-4i /x, thickness at base often as low as 2 /x. The spores, 
