508 FUNGI IMPERFECTI. 



leaves of Mespilus (Eriobotrya) japonica causing them to become 

 spotted and to wither. The hyphae live in the epidermis, 

 and form a stroma from which conidia are given off. 



F. tremulae Frank. Frank * gives this as the cause of a 

 disease of the aspen (Populus tremulci). The leaves turn 

 brown and fall, the shoots in consequence soon drying up. 

 Conidia are developed on the surface of dead leaves and ger- 

 minate on living leaves of aspen, producing a germ-tube which, 

 after forming an adhesion-disc, penetrates into the cavity of 

 the epidermal cells. 



F. depressum B. et Br. is found on living leaves of Angelica sylvestris. 

 (Britain and U.S. America.) 



F. praecox Rabh. On living leaves of Tragopogon oriental/is. 



F. sorghi Pass. On living leaves of Sorghum halepense. 



The following are North American species : 



F. caryogenum Ell. et Langl. On leaves of Carya olivaeformis. 



F. effusum Wint. On leaves of Carpinus americana. 



F. destruens Peck. On living Avena sativa. 



F. fascicalatum C. et E. On leaves and steins of Euphorbia. 



Scolecotrichum. 



Mycelium greenish. Conidia oblong or oval, produced both 

 terminally and laterally on the conidiophores. 



Scolecotrichum melophthorum (Prill, et Del.).' 2 This pro- 

 duces a melon disease in France known by the name " Nuile." 

 It consists in the fruits and stems becoming spotted, the tissue 

 being completely destroyed. 



Sc. graminis Fuck. Occurs on grasses, especially on the oat. 

 Pammel 3 reports it as also injurious on barley during 1891, 

 in some parts of the United States ; the diseased leaves were 

 marked with brown or purplish brown spots. 



Sc. fraxini Pass. On living leaves of Frcucinus excelsior 

 and F. Ornn*. 



Cladosporium. 



Mycelium greenish. Conidia globose or ovoid, one to four- 

 celled, and of variable form. The species are mostly sapro- 

 phytes on substrata of all kinds. 



1 Bar. d. deutxch. botan. GexeU, 1883, p. 29. 

 -Bull' tin <!' la sof. mi/co/oi/. <l /'/<///<<?, 1891. 

 '''Journal of Mycology, vn., p. 96. 



