256 Report OF THE BOTANICAL DEPARTMENT OF THE 
straight, slightly curved, ends obtuse, often biguttulate, hyaline. 
On leaves and other parts of watermelon.’’'® 
As stated before, the watermelon vine sent Mr. Chester in the 
autumn of 1890 is presumably used to inoculate young water- 
melon plants in 1892, according to the article in the annual re- 
port previously cited, but it seems more plausible to assume 
that the material used was collected in 1891, as suggested by 
the prevalence of the disease during that season. At any rate, 
during the early part of 1892 young watermelon plants were 
inoculated with spores obtained from an old diseased vine. 
Spots appeared on the leaves and later Phyllosticta pycnidia. — 
A Mycospherella found.—Watermelon leaves, which had 
been preserved in press, were put into a moist chamber. In 
10-14 days pycnidia of the same Phyllosticta appeared on the 
leaf-spots, and among them, perithecia of a Mycospherella with 
spores measuring 14 x 5 Hp. 
Mr. Chester studied the disease in the field during 1892. On 
some fresh, characteristically diseased plants, he found also a 
“pink anthracnose on the same spots.” The anthracnose is 
presumed to be Gleosportum lagenarium (Pass.) Sace. et 
Roum.,"* and is said “to agree with No. 2448 b. in Ellis’ N. A. 
Fungi, which is there marked OJ[olletotrichum]| lagenariwm 
Pass. var. follicolum E. & E.” 
“To prove the relationship of the Colletotrichum to the dis- 
ease under discussion, several young watermelon plants grow- 
ing in the field were on July 28 thoroughly atomized with water 
containing in suspension Colletotrichum spores taken from 
watermelon rind. On August 3 the plants began to show the 
characteristic appearance of the disease and in less than one 
week were. entirely dead. The check unatomized plants re- 
mained perfectly healthy.”!* Similar inoculations were re- 
When p. 374. | 
" Collectotrichum lagenarium (Pass.) Sace. et Roum. is said to be identical 
with C. oligochetum Cavara, given out as No. 99 in Briosi et Cavara’s Funghi 
Parassiti, and not No. 100, as stated by Mr. Chester in a foot note on p. 78, 
Del. Exp. Sta. 5th Ann. Rpt. and by Dr. Halsted on p. 350, N. J. Exp. Stas, 
Rpt. for 1893, New Brunswick, N. J. 
? Del. Exp. Sta. 5th Ann. Rpt. p. 78. 
