98 Bulletin 313 



or less circular or oblong, sometimes confluent spots with white 

 sunken centers and red margins on the leaf and stem. Spots fre- 

 quently crack open. Acervuli most common on fruit and twigs, very 

 small, grouped, sub-epidermal, spore masses pink, conidia, usiially 

 oblong with rounded ends, sometimes slightly curved, hyaline, 5-6 x 

 2-3 fx. 



585. Infected gfape cane. 586. Infected berry. 587. Cross-section throno:h 

 acervulus showing conidiophores and conidia in various stages of development, 

 1/12. 588. Spores, 1/12. 



Glceosporium betularum E. & M. — On the leaves of the red birch 

 (B. nigra). Causes more or less circular yellowish-brown spots with 

 black borders about 2-3 mm. in diameter. Acervuli brown, 

 120-140 fjL. in diameter. Conidia, obovate, hyaline, 9-10.5 x 6 /*. 



589. Infected leaf of red birch 590. Cross-section of acervulus, 2/3. 5^1. 

 Same, 1/12. 592. Spores, 1/12. 



Glceosporium cingulatum Atk. = Glomerella cingulata (Atk.) 

 S. & S., page 52). — On the leaves of Ficus elastica. Causes large 

 spots and dying of the leaves. Acervuli numerous, black, erumpent, 

 spore tendrils salmon-colored, broad and flat ; conidia oblong, usually 

 rounded at ends, sometimes sHghtly curved, hyaline, guttulaie, 

 12-16.6 X 3.3-5 fx. 



593. Acervuli on Ficus elastica, 2/3. 594. Spores, 1/12. 595. Infected twig 

 of privet. 596. Conidiophore and conidia, 1/12. 



Glceosporium cary^ E. & D. (= Gnomonia carycB Wolf, page 

 58). — On the leaves of the hickory. Causes a spotting and blighting. 

 Spots suborbicular, reddish-brown on lower surface, ^ cm. in di- 

 ameter, frequently confluent with indefinite margins ; acervuli on the 

 lower surface, numerous, subcuticular, brown, 70-150 /i, in diameter; 

 conidia oblong, or allantoid, 1-celled, 7-10 x 1.5-2 ju. Spores develop 

 in late summer or fall. 



597. Infected hickory leaflet. 598. Spores, 1/12. 



Glceosporium caulivorum Kirch. — On the stems of red clover. 

 Causes peculiar cankers. Acervuli very small, punctiform, grouped, 

 erumpent, more or less sunken ; conidiophores cylindrical, stipitate 

 and slightly longer than the conidia. Conidia, cylindrical to fusoid, 

 straight or curved, ends obtuse or acute, hyaline, granular, 12-22 x 

 3.5-5.2 [I. 



.599. Spores, 1/12. 



*Syn. Leptostromella elastica E. & E. 



