THE FUNGI WHICH CAUSE PLANT DISEASE 621 



Altemaria Nees. (p. 616) 



Conidiophores fasciculate, erect, sub-simple, short; conidia 

 clavate-lageniform, septate, muriform, catenulate. 



In part=Pleospora. See p. 259. 



Some thirty or more species, many of pronounced economic im- 

 portance. 



A. sp. on Tropceolum=Pleospora tropoeoli. See p. 260. 



A. trichostoma Died, on barley=Pleospora trichostoma. See 

 p. 260. 



A. forsythise Harter.'^ 



Hjrphae cespitose, amphigenous; spot concentric zonate: conidia 

 18-60 X 10 X 16.5 II. 



It causes subcircular leaf spots on cultivated Forsjrthia. 



A. brassicse (Berk.) Sacc. 



Conidiophores short, continuous, short-branched, apically 

 equal, conidia elongate, fusoid, clavate, 60-80 x 14-18 ai, 6 to 8- 

 muriform-septate, oUvaceous. 

 On crucifers. 



A. brassicse (Berk.) Sacc. 

 var. phaseoli Brun. occurs on 

 beans in Italy. 



A. cucurbitse Let.^^ ^" may 

 be identical with A. brassicse. 



It was noted by Thax- 

 ter in Connecticut causing 



blight of melons. The black Fig. 419. — A. violae, germinating spores. 

 , , . . - , 1 11 After Dorsett. 



mold is copious in the older 



circular spots. Pure cultures were obtained and successful in- 

 oculations were made on normal iminjured melon leaves. 



It is also reported by Selby^^* as the probable cause of muskmelon 

 leaf spots in Ohio, and it is a common source of troubles on various 

 cruciferous hosts. 



A. tenuis Nees.'® is reported by Behrens on tobacco seedlings. 



A. violae G. & D. '» 



Conidiophores erect, pale-olive, septate, simple, 25-30 x 4 ^t, 

 conidia in chains at or near the apex of the conidiophore, clavately 



