Robinson. — Notes on the Genus Taphrina. 169 
when eight in number, are nearly spherical and 3I-5I M in 
diameter, but by division their size is reduced to about 2 /x. 
Beside this form on the peach, a Taphrina has been found 
at Germantown, Pa. (Mr. Mehan), on the leaves of c escaped 
cherry-trees.’ As to the species or variety of the host, I 
regret to say, I can give no exact information. The parasite 
is probably the Exoascns Wiesneri of Rathay, which is now 
regarded merely as a form of T. deformans. As in the 
peach-curl, the infected cherry-leaves become much wrinkled 
and distorted ; the small branches attacked are also some- 
what modified and show a tendency toward forming c witches’ 
brooms 5 (Hexenbesen), such as are described by Rathay h 
The asci are developed on both surfaces of the leaf, and 
closely resemble those of the typical form on the peach, 
though perhaps a little more slender; in length they are 
27-33 in thickness 5-8 /x. The stalk-cells are taller than 
any I have seen on peach-leaves, and do not taper so much 
below ; they are 17-18 /x high, and 5-7 /x thick. 
A Taphrina, , probably the same as this, has been found 
several times in Massachusetts deforming the leaves and 
branchlets of P. serotina , Ehr. 
T. PURPURASCENS, sp. nov. 
Ascomyces deformans , var. purpurascens^ Ellis et Ever- 
hart, North American Fungi. 
This form occurs on the leaves of Rims copallina , L., and 
has been found in Massachusetts at Dartmouth, Salem, 
Wood’s Holl, and other localities ; in Connecticut at New 
London; and also in New Jersey. The infected leaflets 
may be recognized by their dark purple colour and wrinkled 
appearance, as well as by their limp and pendent condition. 
Furthermore, it may be noted that the softer parts of the 
leaf tissue swell out between the nerves and become convex 
above and concave beneath. The dark colour is at first 
1 Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften, Math, und 
Naturwiss. Kl. ; Wien, Band lxxxiii (1881), p. 267. 
N 
