260 Report OF tHE BOTANICAL DEPARTMENT OF THE 
Chester tried to show that his Phyllosticta is the same as a 
certain Colletotrichum; he succeeds in showing that the “ pink 
anthracnose” is parasitic on cucurbits, but fails to connect it 
with his Phyllosticta. Smith tried to connect his Ascochyta 
with Chester’s Phyllosticta citrullina but records only conjec- 
tural evidence. The remarks by Chester on the relation of © 
several anthracnoses, and his Phyllosticta, and the work and 
suggestions by Halsted,”° on the former, need not be considered 
here, because no relation could be found between them and the 
Mycospherella-wilt fungus. 
The production of dead areas on leaves of a host, by pouring 
water laden with spores of a stem parasite of the same host on 
them, is no proof that the fungus normally parasitizes the 
leaves.2° Especially is this true when the dead areas or 
spots produced fail to develop the fruits of the fungus used. 
In cases where the inoculated plants are enclosed in moist 
chambers, the results are yet more unreliable. When aerial 
parts of a host are at all susceptible to a certain fungous para- 
Site, it seems probable that, under such conditions, all aerial 
tissues of that host, which have no special structural protection, 
would be more or less attacked, unless the required aeration 
for the fungus were prevented by the excessive moisture. Smith 
records no fruits on his artificially induced leaf spots; nor has 
the writer obtained pycnidia on leaves under any conditions, 
though dead areas developed from moist chamber infections; see 
Plate XI. 
It seems that Chester either overlooked the fructifications of 
the Mycospheerella wilt on the vines, or it was not associated 
with his Phyllosticta leaf-spot, because he makes no mention of 
pycnidia or perithecia on vines; though, according to the 
writer’s observations, to be given later, that is a constant char- 
acter of the disease, both in the greenhouse and in the field. It 
appears more probable that Chester found the two fungi on the 
BN. J. Exp, Stas. Rpt. (1893) pp. 347-56, New Brunswick, N. J. 
*® Miss C. M. Gibson’s infection experiments with various rusts upholds 
such a view. Notes on infection experiments with various Uredinex. The 
New Phytologist 3: 184-191 (1904). 
