THE FUNGI WHICH CAUSE PLANT DISEASE 631 



conidiophores cespitose, small, densely gregarious, fuliginous, 

 subcontinuous, 20-40 x 3-5 n, conidia cylindric, straight, short, 

 30-50 X 3.5-5 /I, subfuscous, 2 to 4-septate. 



On roses. 



C. hypophylla Cav. on roses in Europe is very like the preceding 

 species. 



C. omphacodes E. & H. and C. phlogina Peck, are the causes of 

 rather unimportant leaf spots of cultivated phlox. 



C. neriella Sacc. is on oleander. 



C. sordida Sacc. produces leaf spots and defoliates Tecoma. 



C. angreci Roum. is on orchids; 



C. cheiranthi Sacc. on Cheiranthus. 



C. brunkii E. & G. is reported on the geranium (Pelargonium 

 zonale.) 



C. resedae Fcl.'^ 



Spots punctiform, greyish; conidiophores fasciculate, simple, 

 continuous or few-septate, 50-70 x 4-5 n, fuscous; conidia apical 

 to linear, obclavate, 4 to 5-septate, hyaline, 100-140 x 2.5-3 ju- 



Spots are caused on the mignonette and the plants are blighted. 

 The hyphse appear through the stomata. 



C. odontoglossi P. & D. occurs on cultivated Odontoglossum; 



C. unicolor S. & P. on lily. 



C. richardisecola Atk.^' 



Spots amphigenous, black, with small white centers, subcircular, 

 2-6 mm. broad; conidiophores fasciculate, light-brown with a 

 reddish tinge, becoming reddish-brown, erect or apically flexuose, 

 denticulate, 30-80 x 5 mJ conidia hyaline, obclavate, 4 to 10 

 or more septate, 50-100 x 3-4 fi. 



On calla lily. 



C. microsora Sacc.'' 



Spots amphigenous, minute, brown, gregarious; conidiophores 

 subfasciculate from a tubercular stroma, short, continuous, sub- 

 olivaceous, 20-30 X 3 j«; conidia filiform, 3 to 5-septate, con- 

 stricted at the septa, olivaceous, 35^5 x 3.5 ii. 



It causes spotting and defoliation of Tilia. 



C. cercidicola E. 



Spots amphigenous, dull grey above, rusty-brown beneath, 

 with a blackish-brown raised border; conidiophores amphigenous, 



