464 FUNGI IMPERFECTI. 



as injurious, especially in nurseries and groves where the trees 

 are grown in number. 



Ph. sphaeropsoidea E. et E. is another American species 

 which has become prominent on account of its ravages in 

 nurseries of horse-chestnut. The disease appears about the end 

 of June, and by August the foliage of attacked trees is almost 

 entirely dead. 



Ph. grossulariae Sacc. On leaves of Ribes Orossularia iu Italy and North 

 America. 



Ph. vulgaris Desm. A common species on leaves of species of Lonicera, 

 (Britain and U.S. America.) 



Ph. sambuci Desm. On species of Sambucus. (Britain.) 



Ph. comicola (D.C.). On leaves of species of Comus in America. 



Ph. limbalis Pers. On oblong white spots on leaves of box. (Britain.) 



Ph. tiliae Sacc. et Speg. On leaves of Tilia. (Britain.) 



Ph. maculiformis Sacc. is probably a stage of Sphaerella macidiformU 

 Auersw. It is a dangerous parasite causing a leaf-spot on sweet chestnut 

 {Castanea) and other trees. 



Ph. violae Desm. A source of considerable damage to violets in America ; 

 it also occurs in Europe and Britain. 



Ph. althaeina Sacc has been reported as dangerous to hollyhock in the 

 United States.' 



Ph. phaseolina Sacc appears occasionally as a parasite on leaves of 

 kidney beans. (U.S. America.) 



Ph. viciae (Lib.). On Vicia sepium. (Britain.) 



Ph. cjrsii Desm. On leaves of Cirsium. (Britain.) 



Ph. apii Hals.' produces a leaf-spot on celery, and has caused con- 

 siderable loss in America. 



Ph. tabaci Pass, occurs on leaves of tobacco in Italy. 



Ph. bataticola Ell. et Mart., and others, have been recorded on sweet 

 potato in America. 



Ph. betae Oud. occurs on leaves of sugar beet and mangel. 



Ph. tabifica Prill.^ Prillieux believes the disease of beet- 

 root known as " heart-rot," to be due to this Phyllosticta. It is 

 probably a conidial form of Sphaerella tahijica Prill. The symp- 

 toms of disease are withering of the outer leaves, followed by 

 the appearance of whitish spots with withered tissue filled up 

 with mycelium. Thence the disease spreads into the younger 

 parts and causes " heart-rot " of the root. 



Frank is of opinion that " heart-rot " is caused by Sporides- 



'^N. J. Agric. Exper. Station Report, 1891. 



^Prillieux et Delacroix, Bvllet. de la soc. mycoL de France, vii., 1891. 



