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 fungus. Acervuli 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 yu,. 



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

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



CoLLETOTRiCHUM OMNivoRUM Hals. — On Icavcs of Aspidistra 

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

 yellowish margins, gradually spreading and frequently destroying the 

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

 pointed; conidia hyaline, usually slighth' curved, 20-28 x 3-5 fx. 



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



COLLETOTRICHUM PHOMOiDES (Sacc.) Chcs. — 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. 

 Acervuli abundant, grouped, brown or black, 95 to 150 ;«,; setae num- 

 erous, dark, usually curved, septate, 65-112 ^w.; conidiophores short, 

 slender, 30-40 /x in length ; conidia oblong with rounded ends, 16-24 

 X 4/x. 



664. Infected fruit of tomato. 665 Acervulus showinj.> 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, 

 (lark, sunken spots. Acervuli scattered or grouped ; erumpent ; setae 

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

 l)hores cylindric or f usoid and hyaline ; conidia pinkish in mass, more 

 or less oblong, 3-4 x 11-13 ju. 



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

 1/12. 



COLLETOTRICHUM viOL^-TRicoLORis R. E. Smith.-^On the leaves 

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

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



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



