THE FUNGI WHICH CAUSE PLANT DISEASE 249 



120-150 fi high; conidia attenuate above, 5 to 7-septate, hyaline, 

 70-100 X 3 Ai. On cotton. 



The intercellular mycelium is irregular, branched, septate, and 

 produces tuberculate stromata from which the brownish hyphae 

 arise. The perithecia, much less common, are partly immersed 

 in old leaves. 



M. morifolia (Fcl.) Lin. in its conidial stages, Cylindrosporium 

 mori and Septoglceimi mori, affects Morus. 



M. maculifonnis (Pers.) Schr. grows on many trees. Especially 

 common are its conidial stages Cylindrosporium castinicolum and 

 Phyllosticta maculifonnis. 



M. rosigena E. & E. "«-"« 



Amphigenous on reddish-brown, purple-bordered spots which 

 are about 3-4 mm. in diameter; perithecia thickly scattered over 

 the spots, minute, 60-75 /*, partly erumpent, black; asci sub- 

 clavate to oblong, 25-30 x 8-10 ai; spores biseriate, clavate- 

 oblong, hyaline, 1-septate, 10-12 x 2 /*, ends subacute. 



It causes leaf spots of rose in America. 



M. brassicsecola (= Phyllosticta brassicsecola) grows on cabbage. 



M. punctiformis Pers. produces leaf spot on oak, lime, hazel; 



M. fagi Auser. on beech; 



M. pinifolia Due. on pine leaves; ^ 



M. abietis (Rost.) Lin. a leaf disease of balsam.^^ 



M. taxi Cke. grows on yew; 



M. hedericola Desm. on Hedera leaves; 



M. gibelliana Pass, on Citrus leaves; 



M. vitis Fcl. on grape leaves; 



M. elasticae Kr. ^^^ on Ficus elastica. 



M. cydoniae Vogl. ^^^ on quince is probably identical with 

 M. sentina on pear and apple. 



M. ulmi Kleb. occurs on elm with its conidial forms, a Phleo- 

 spora and Phyllosticta bellunensis. 



M. comedens Pass, is on the same host. 



M. larcina Hart, and its conidial form Leptostroma larcinum 

 affect larch, causing defoliation. 



M. loefgreni N. on oranges and M. coffeae N. on coffee are 

 tropical forms. 



M. populi Schr. (=Septoria popuU) is on Populus.'** 



