THE FUNGI WHICH CAUSE PLANT DISEASE 



617 



Fia. 416. — Sporodesmium 

 antiquum. After Sac- 

 caxdo. 



S. exitiosum var. solani Schenck is reported as the cause of a 

 potato disease. 



S. solani-varians Yanha is the cause of 

 potato disease in Europe, the foliage bearing 

 brown spots and finally dying in a manner 

 resembling death caused by Phytophthora. 

 Cladosporium and pycnidial forms are said 

 to exist. 



S. mucosum Sacc. was reported by Ader- 

 holt on cucumber fruit and leaves causing 

 disease. 



S. scorzonerae Aderh. causes a salsify 

 stem and leaf disease.'^* 



Other parasitic species are: 



S. melongena Thiim. on egg plant; 



S. dolichopus Pass, on potato leaves in 

 Italy; 



S. ignobile Karst. on asparagus; 



S. putrefaciens Fcl. on beet; 



S. brassicae Mas. on Brassica in Bengal. 



Coniothecium Corda (p. 615) 



Hyphse obsolete or poorly developed; conidia 

 genuniform in origin, variously septate. 



Over fifty species of very simple parasitic or 

 saprophytic fungi. 



C. chomatosporum Cda. resembling apple 

 scab in its effect is noted as common in Tas- 

 mania^** and Australia.^*" 



Stemphylium Walroth (p. 616) 



Conidiophores decumbent, intricately 



branched, hyaline or smoky; conidia acrogenous, 



ovoid to subglobose, 2 to many-muriform- 



^Sum'-^tWa^d septate, fuligineus. 



cardo. Over thirty species. 



S. ericoctonum B. & deB. is parasitic on Erica in green-houses. 



