POLYTHRINCIUM CLADOSPORIUM. 393 



Erect, hyphae or conidiophores usually erect or ascending, 

 simple, branched, or nodulose, usually forming velvety olive 

 tufts or cloud-like patches on leaves, &c. Less robust than 

 Helminthosporium and distinguished by the smaller, usually 

 1 -septate spores. 



f On Dicotyledons. 



Cladosporium epiphyllum. Mart. 



Tufts minute, forming rather olive-black, circular patches ; 

 hyphae at first erect, then more or less declinate, branched, 

 much intermixed, pale olive ; conidia elliptic-oblong, con- 

 tinuous, then 1-3-septate, arranged in chains, olive 10-22 x 

 4-6/i. 



Cladosporium epiphyllum, Mart., Erlang., p. 351 ; Sacc., 

 Syll., iv. n. 1718. 



On leaves of Quercus, Platanus, Populus, Laurocerasus, 

 Hedera, &c., usually appearing on the under surface, under 

 the form of numerous small patches. 



Cladosporium sphaerospermum. Penz. 



Tufts conspicuous, aggregated, confluent, forming a velvety 

 layer; hyphae erect, septate, brown, 150-300 X 3-5-4 \L; 

 conidia terminal or very near the apex, very variable, 

 generally spherical or elliptical, concatenate, rarely 1 -septate, 

 smaller form 3-4 x 4 /x, ; larger 6-14 x 8*5-4 /A, olivaceous, 

 smooth. 



Cladosporium sphaerospermum, Penzig, Fung. Agrum. in 

 Mich., ii. p. 473 ; Sacc., Syll., iv. n. 1688. 



On fading twigs and leaves of Cilrus. 



Cladosporium fulvum. Cooke. 



Effused, minutely velvety, reddish-brown ; hyphae erect, 

 wavy, sparsely septate, nodulose, sparingly branched, 

 brownish ; conidia elliptical, 1-septate, scarcely constricted 

 at the septum, pale fulvous, pellucid, 10-20 x 4-5 p.. 



Cladosporium fulvum, Cke., in Eavenel's Fung. Amer. Exs., 

 n. 599; Grevillea, 1883. p. 32 ; Sacc., Syll., iv. n. 1731. 



Cladosporium lycopersici, Plow. 



On living leaves of tomato (Solatium lycopersicum). 



Cladosporium lignicolum. Corda. 

 Tufts thin, rather compact, black, -1 in. across ; fertile 



