DS. REPORT OF THE BoraNICAL DEPARTMENT OF THE 
it has not been found on the leaves (the fruiting bodies there- 
fore not occurring in spots), there is no reason to put the pyc- 
nidial form in Ascochyta. For these reasons it is retained in 
Diplodina. Smith having transferred the species name of 
Chester’s Phyllosticta to both spore-forms, it is used, though 
his description of the imperfect form must be discarded, and 
his characterization of the perithecial form is very general, scat- 
tered and incomplete. 
TECHNICAL DESCRIPTION OF THE MYCOSPHE- 
RELLA-WILT FUNGUS. 
Mycospherella citrullina (C. O. Sm.) Grossenbacher. 
Spherella citrullina C. O. Smith, Delaware Experiment Sta- 
tion Bulletin 70 (1905),. Newark, Del. 
The perithecia are roughish, dark-brown to black, depressed- 
globular to inverted-top-shaped, with, generally, papillate 
ostiola, simple, densely scattered, erumpent and finally almost 
superficial, 100-165 pw, The asci are cylindrical to clavate- — 
cylindrical, aparaphysate, sessile to subsessile, 45-58 x 7-10 yp, 
Spores, mostly uniseriate, two-celled, hyaline, oblong-fusoid to 
fusoid, with one or both cells bluntly ovoid and therefore 
constricted at the septum (distal celi often larger) or not con- 
stricted. . 
On the vines of Cucumis Melo and probably Citrullus vul- 
garis, 
Diplodina citrullina (C. O. Sm.) Grossenbacher. 
Ascochyta citrullina ©. O. Smith, Delaware Experiment Sta- 
tion Bulletin 70 (1905), Newark, Del. 
The pycnidia are slightly depressed-globular, with pore-like 
ostiola, and of light-brown to dark-brown color; subepidermal 
to cortical erumpent and simple, 100-165 -. Spores, hyaline, 
two-celled, more or less cylindrical, with rounded or tapering 
ends. They may or may not be straight or constricted at the 
septa, 10-18 x 3-5 pz. 
On the vines of Cucumis Melo and probably Citrullus vul- 
garis. 
