372 



ColletotricJium Lycopcrsici, n. sp. 



Spots depressed, circular, slightly discolored, center black, 

 5—10 n in diameter, afterwards becoming irregular and confluent. 

 Acervuli abundant, densely gregarious, rusty brown to black, 

 applanate, 95— 1 50 mm. in diameter. Setse abundant, fulignous, 

 generally curved, rarely undulate or straight, often geniculate in 

 places, gradually tapering, septate, length 65-1 12 /.i, about 5 /< at 

 base. Spores oblong 16— 22/^X4, average 18-20X4, ends sub- 

 acute, hyaline, generally containing two to three oil drops which 

 stain brown with osmic acid. Basidia short, slender, 30-40 /', 

 arising from a well-developed stroma. On fruit of cultivated 

 tomato. 



A Leaf Spot of Celery. 



Not long since some celery leaves were brought into my lab- 

 oratory by a local gardener with the complaint that his celery 

 plants were suffering badly. To general appearance the affection 

 seemed to be the ordinary leaf blight, {Ccrcospora Apii, Fres.), 

 but closer observation showed the spots to be covered with 

 numerous black pustules, which upon further examination proved 

 to be the pycnidia of a Septoria. 



Examinations were at once made in other celery gardens, and 

 in all the same disease was found. The effect upon the plant is 

 very similar to that of the well known leaf blight, causing in 

 extreme cases a complete wilting of the leaves, and in the case 

 of younger growths a complete destruction of the entire plant. 



The spores, which germinate readily in water, were sown 

 upon healthy leaves with the result that in fifteen days the char- 

 acteristic spots were produced at the points of infection, upon 

 which were developed pycnidia containing the spores of this 

 fnngus. The fungus of the disease is apparently dislinct from 

 Septoria Paslinacce, West, and from 5. pastiiiacina, Sacc, both 

 found on Pastinaca sativa, L.; the former species having larger 

 and septate spores, while the Septoria on celery is to all appear- 

 ance non-septate. The latter species differs in having much 

 smaller spores (20-30/* X 7-1 /a) and larger pycnidia (120-150 n). 



The fungus, according to the opinion of Mr. J. B. Ellis, is 

 more closely related to Septoria Petroselini, Desm., but is prob- 

 ably not identical with it. 



Through Dr. D. H. Halsted I am informed that Briosi has 

 named a variety of the last species, i. e. 5. Petroselini, var. Apu, 



