108 Bulletin 313 



CoLLETOTRiCHUM NIGRUM. E. & H. — On the pods of the pepper. 

 Causes black, sunken spots and is followed by decay. The seed are 

 frequently affected with the fungiis. Acervmli numerous, superficial 

 and on both outside and inside of the pods ; setae numerous, black, 

 long, pointed, 3- or 4-septate ; conidia oblong, somewhat curved, 

 acutely pointed, 18.2-26.6 x 3-3.3 /i. 



657. Acerv'ulus showing bristles, 2/3. 658. Acervulus showing emerging 

 spores, 2/3. 659. Conidiophores, spores and bristles, 1/12. 660. Spores, 1/12. 



CoLLETOTRiCHUM oMNivoRUM Hals. — On leaves of Aspidistra 

 and other plants. Causes spots which are dry, irregular gray with 

 yellowish margins, gradually spreading and frequently destroying the 

 entire leaf. Setae numerous (Halsted says "few"), black, prominent, 

 pointed ; conidia hyaline, usually slightly curved, 20-28 x 3-5 ju,. 



661. Spot on leaf of Aspidisfta sp. 662. Bristles, 2/3. 663. Spores, 1/12. 



CoLLETOTRiCHUM PHOMOiDEs (Sacc.) Ches. — On the fruit of the 

 tomato. Causes circular, depressed, water-soaked spots which vary 

 in size and become blackish, unite and finally rot the entire fruit. 

 Acervtdi abundant, grouped, brown or black, 95 to 150 /u.; setae num- 

 erous, dark, usually curved, septate, 65-112 fi; conidiophores short, 

 >iender, 30-40 fj. in length ; conidia oblong with rounded ends, 16-24 

 x4 fi. 



664. Infected fruit of tomato. 665 Acervulus showing bristles, 2/3. 666. 

 Bristles, 1/12. 667 and 668. Spores from different sources, 1/12. 



CoLLETOTRiCHUM RUBicoLUM E. & E. (= Glomerella ruhicola 

 (Ston.) E. &E., page52). 



COLLETOTRICHUM TRiFOLii Bain.— On the stems and occasionally 

 on the leaves of clover and alfalfa. Causes more or less elongated, 

 dark, simken spots. Acervuli scattered or grouped ; erumpent ; setae 

 few or many, usually septate, dark, with light-colored tips ; conidio- 

 phores cylindric or fusoid and hyaline; conidia pinkish in mass, more 

 or less oblong, 3-4 x 11-13 /i. 



669. Spots on infected stem of Trifolinm sp. 670. Bristles, 1/12. 671. Spores, 

 1/12. 



CoLLETOTRiCHUM viOL^.-TRicoLORis R. E. vSmith. — On the leaves 

 and blossoms of the pansy. Causes small, yellowish, often confluent 

 spots with distinct black margins. Acervuli numerous 50-150 /x in 

 diameter; setae solitary or in twos, brownish, 1-3 septate, 20-70 fi 

 long, tapering to a blunt tip; conidia oblong, rounded at the end, 

 sometimes slightly curved, granular, guttulate, 20 x 5 /i. 



672. Infected pansy leaf. 673. Bristle, 1/12. 674. Spores, 1/12. 



