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 fi. 



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 toi brownish mold on the under 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 

 4/x. 



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



Cladosporium herbarum (Pers.) Lk. (=r Alycosphcerella 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 /a. 



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- 

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

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

 80-120 x 20 /x. 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. 



Polythrincium trifolii Ktze. (= Phyllachora trifolii (Pers.) 

 Fcl., page 42). 



FusiCLADiuM DENDRiTicuM (Wal.) Fcl. (= Venturia incequalis, 

 page 48). 



FusicLADiUM piRiNUM (Lib.) Fcl. (= Veuturia piHna, page 48). 



