THE FUNGI WHICH CAUSE PLANT DISEASE 551 



C. trifolii Bain."*-^^'' 



Spots dark, depressed; acervuli erumpent, scattered or gre- 

 garious; eonidia straight, ends rounded, 3-4 x 11-13 /t; conidio- 

 phores cylindric or fusoid, hyaline; setae few or many, continuous 

 or uniseptate, dark, paler apically, 4-7 x 39-62 n, sinuous, or 

 nodose. 



It occurs as an anthracnose producer on stems, rarely on leaves, 

 of clover and alfalfa causing very serious injury. In general ap- 

 pearance it is much like Gloeosporium caulivorum. 



C. spinacisB E. & H.^" 



Spots roundish, dirty-white, or greenish, 2-4 mm., with a slightly 

 raised border; acervuli amphigenous, punctiform, 40-75 n, with 

 3-12 erect or spreading bristle-like setae, 60-75 x 4-4.5 n, sub- 

 bulbous at base, subhj'aline, subacute above, dark brown below; 

 eonidia subfalcate, fusoid, 2 to 4-guttulate, 14-20 x 2.5-3 /*, ends 

 subacute; conidiophores short. 



It produces blotches on spinach leaves. 



C. phomoides (Sacc.) Ches.'®'««' i"-i"' i" 



Spots depressed, circular, slightly discolored, center black, 

 5-10 nmi., later irregular and confluent; acervuU abundant, 

 densely gregarious, rusty brown to black, applanate, 95-150 n; 

 setae abundant, fuliginous, generally curved, septate, 65-112 n; 

 eonidia oblong, 16-24 x 4 /i, ends subacute; conidiophores 

 short, slender, 30-40 /x high, arising from a well developed 

 stroma. On tomato. 



This is a common cause of ripe rot of tomatoes. The fungus was 

 studied in culture by Stoneman^ who reported it as somewhat 

 different from G. rufomaculans, though Edgerton '^ thought the 

 apple and tomato forms the same. Work by Gueguin ^^* throws 

 doubt on the American form on tomato being identical with the 

 European form known as G. phomoides. Chester ^^^' **^ has 

 reported what he regarded as the last species as setigerous. 



C. nigrum, E. & H.i»' ^^ 



Spots blackish, depressed; decaying; acervuli nimierous, su- 

 perficial; setae numerous, slender, setae pointed; eonidia ob- 

 long. 



This form which appears quite different from G. piperitum was 

 described from New Jersey by Halsted. 



