232 AGRICULTURAL EXPERIMENT STATION. [Jan. 



Our form may be described as follows : Pycnidia appearing 

 on the brown leaves after the coalescence of Cercospora 

 spots, amphigenous, black, scattered, 100 to 160 mmm. in 

 diameter ; flattened when of the larger, globular when of the 

 smaller, diameter ; pycnospores somewhat curved, slightly 

 tapering to both ends, usually 3-septate, rarely 2- or 4- 

 septate, 24.-34. x 1.7-2. mmm. 



It remains much to be desired that the perfect form of this 

 fungus should be discovered. It will probably be found 

 eventually on blighted celery leaves which have lain on the 

 ground through the winter, or on rubbish near by, in spring. 



Note. — Since the above was written Mr. F. D. Chester, 

 of the Delaware Experiment Station, has described * what is 

 doubtless this form as occurring on celery in that State, and 

 thinks it may be that known in Europe as Septoria Petrosel- 

 {m'Desio., var. .4/mBriosi. 



Clover Fungi. — Two fungi annually cause much damage 

 to the clover on the station meadows and elsewhere in 

 Amherst and in other parts of the State. One of these is 

 the rust fungus ( Uromyces Trifolii (Hedw.) Lev.), which is 

 most harmful in its summer and winter spore stages, which 

 are developed almost simultaneously in June and July. 

 They appear in the form of pustules of different shades of 

 brown, which burst through either surface of the leaf, and 

 consist of the closely packed spores of the fungus. 



The other fungus is the black mould (Polythrincium 

 Trifolii Kze.), which appears in thickly scattered black 

 spots over the under surface of the leaves. This form is 

 often followed by the development of black crusts on the 

 affected leaves, which have been named Phyllachora Trifolii 

 Pers., and are supposed to represent the perfect form of the 

 fungus ; but the winter spores which should develop in them 

 have never been described. 



Both of these fungi reduce the fodder value of the clover to 

 a minimum, and cause considerable reduction in the size of 

 the leaves and in the general vigor of the plant, and are 

 therefore real pests and sources of real loss. 



A Fish-hatchery Fungus. — Early last spring I received 

 from the Northampton fish-hatching establishment, through 



* Bulletin Torrey Bot. Club, December, 1891, p. 373. 



