122 Bulletin 313 



Cladosporium carpophilum Thiim. — On fruit, foliage and twigs 

 of peaches, plums, nectarines and cherry. Causes the scab or 

 freckles. Fungus grows on surface of fruit, causing small, circu- 

 lar, blackish, occasionally confluent spots on the surface of the fruit. 

 It also attacks the twigs, causing a cracking of the cuticle and also 

 causes "shot holes" in the foliage. The conidiophores are erect, 

 simple, sinuous, septate; conidia, ovate, obtuse, continuous or 1-sep- 

 tate, 10-12 X 4-6 /x. 



741. Infected peach. 742. Conidiophores and conidia, 1/12. 



Cladosporium fulvum Cke. — On the leaves and fruit of the 

 tomato, in the greenhouse and sometimes in the field. Causes a 

 dense white or grayish to brownish mold on the imder surface of the 

 leaves, and in severe cases on the upper surface, and a rotting of 

 the fruit. Upper surface of the leaf yellow. Conidiophores rup- 

 turing the cuticle, dense, sparingly branched, septate nodulose ; coni- 

 dia few, elliptic to oblong, 1-4 septate, translucent, tawny, 10-20 x 



743. Infected tomato leaf. 744. Conidiophores, 1/12. 745. Conidia, 1/12. 



Cladosporium herbarum (Pers.) Lk. (= Mycosphcerella tulas- 

 nei Jarz.). — On the maturing heads of wheat. Causes a dense, vel- 

 vety black growth over the glumes ; conidiophores erect, septate, 

 rarely branched, often nodose or keeled ; conidia often in chains of 

 2 or 3, more or less cylindrical with rounded ends, pale olive-green, 

 1-3 septate, 10-15 x 4.7 /i. 



746. Infected head of wheat. 747. Conidiophores, 1/12. 748. Spores, 1/12. 



Helminthosporium inconspicuum C. & E. — On corn leaves. 

 Causes peculiar large, elongated, brownish blotches, frequently sur- 

 rounded by a broad reddish-border. Hyphse elongated, septate, no- 

 dulose, pale brown ; conidia lanceolate, thick-walled, 3-5 septate, 

 80-120 X 20 fi. An Alternaria sp. is frequently present on the larger 

 and older spots. 



749. Part of infected leaf of corn. 750. Conidiophores, 1/12. 751. Conidia, 



1/12. 



PoLYTHRixciu^t TRiFOLii Ktze. {= Phyllachora trifolii (Pers.) 

 Fcl., page 42). 



Fusicladium dendriticum (Wal.) Fcl. (= Venturia in^qualis, 

 page 48). 



Fusicladium pirinum (Lib.) Fcl. (= Venturia pinna,-pdige4S) . 



