New York AGRICULTURAL EXPERIMENT STATION, P61 
same plants in Delaware, and that, since both are parasitic on 
the same host, they were confused with each other. Chester’s 
characterization of the disease, and his finding a Mycosphe- 
rella seem to indicate that he also had Smith’s fungus. From 
one of Smith’s sentences, quoted on page 258, it seems possible 
that he had two fungi of the same type; on that assumption 
Chester may have had the other Mycospherella. However, 
that suggestion is probably incorrect, though the quoted sentence 
is too ambiguous to be certain of its meaning. 
The relation of Smith’s, ascosporic and pycnidial forms of the 
_ parasite is definitely shown, and sufficient scattered description 
of both is given, so that, with the aid of his photograph of a 
diseased squash stem (Plate IX, fig. E. of this bulletin) and 
a large quantity of squash-stem material, obtained from the 
Delaware Station in 1907, (collected and labeled by C. O. 
Smith) there is no doubt that Smith had the same fungus which 
is discussed in this publication, though his technical descrip- 
tion of the imperfect form should be discarded, because it is 
only an amended form of Chester’s description of Phyllosticta 
citrullina. As indicated before, Phyllosticta citrullina Chester 
seems only an accidental associate of the Mycospherella-wilt 
fungus, and has never been found by the writer. 
According to the evidence obtained, there is no reason to sup- 
pose that the Mycospherella-wilt fungus is at all related to 
Spherella (Lestadia) Cucurbitacearum (Schw) ? Cooke (see 
appendix), but it seems possible that Spheria Cucurbitacearum 
Fries may be a Phoma®* often found on the rind of squashes, 
etc. At any rate, spore measurements attached to that species 
by Saccardo,?* and seemingly copied by Allescher,’® correspond 
very nearly to this Phoma, the spores of which measure 7-10 pz, 
Whether or not this rind Phoma is a form of Cooke’s Sphe- — 
rella (Lestadia) Cucurbitacearum can not be determined with- 
21 Material of this type was obtained from the Mycologists at the Delaware 
Experiment, Station, in 1907, which was collected and labeled Ascochyta, 
by C. O. Smith, Dec. 1903, at Newark. 
8 Sylloge Fungorum, III, p. 148. 
22 Rbh. Kr.—Flora, Vol. I, pt. 6, p. 284. 
