106 Bulletin 313 



CoLLETOTRiCHUM KENTi-^ Hals. — Oil the leaves of Kentia foster- 

 iana. Causes more or less circular, more or less grayish-brown ir- 

 regular spots with dark margins. Acervuli nmnerous on both sur- 

 faces of the leaf, epidermis forced up and ruptured by the growing 

 fungus, spores, salmon-colored in mass, cylindrical rounded ends, 

 straight or slightly curved, hyaline, 16.6-20 x 5-6 /a. 



643. Infected leaflet of Kentia fostcriana. 644. Conidiopliores, bristles and 

 spores, 1/12. 



COLLETOTRICHUM UEDERicoLA Laub.- — On the living leaves, rarely 

 on petioles and branches of Hedera helix. Oval or circular brown 

 spot about 15 mm. in diameter on both surfaces of the leaves. Acer- 

 vuli on both surfaces, gregarious ; setae straight or curved, septate, 

 7 [X broad at base, sometimes as much as 140 /x in length ; conidia 

 1-ceIled, hvaline oblong or subfusiform slightly curved, usually gut- 

 tulate, 17-26.6 X 3.3-3.5 ja. 



645. Portion of leaf of Hrdcra helix showing spot. 646. Acervulus, 2/3 

 647. Conidiophores, liri sties uid spores, 1/12. 648. Mature spores, 1/12. 



CoLLETOTRiciruM LAGENARiuM (Pcrs.) E. & H. — Causes spots on 

 the fruit and leaves of watermelons, cucumbers, squash, pumpkins 

 and citrons. Causes brown spots on the leaves and in severe cases 

 an early maturity ; causes water-soaked, sunken spots on fruit which 

 develop into rotten areas of various sizes containing numerous acer- 

 vuli. Spore mass prominent -and pink in color. Conidia variable in 

 size and shape, hyaline. There is considerable evidence to indicate 

 that this is really Colletotrichum lindemuthiannm. 



649. Spots on fruit of watermelon. 650. Spores , 1/12. 



Colletotrichum lindemuthianum (Sacc. & Mg.) B. & C. — On 

 the stems, leaves, pods and seeds of the bean, causing elongated, 

 black spots or streaks on the stems, which become somewhat sunken 

 and pinkish during exudation of spores ; causing similar spots on 

 petioles and veins of leaves ; causing small, dark-colored more or 

 less circular spots on pods becoming large, sunken and pinkish with 

 spore formation and frequently uniting into unsightly canker-like 

 areas ; causing yellowish, brownish or blackish spots on seeds. 

 Acervuli scattered and surrounded by few, rather inconspicuous 

 black setae, conidiophores cylindric, simple, 45-55 fi. Conidia ob- 

 long, ends rounded, 15-19 x 3.5-5.5 /*. 



651. Infected root and stem of bean. 652. Infected pods. 653. Cross-section 

 through infected pods. 654. Infected seedlings. 655. Bristles, 1/12. 656. 

 Spores, 1/12. 



