VAKIABILITY OF GLOMERELLA. 



63 



Table II. — Hosts from which ascogenous perithecia of Glomerella as well as conidi 

 have been reported either in cultures or on the host, or both — Continued. 



Host. 



Perithecia. 



Paraphyses. 



Investigators. 



Cultures. 



Host. 







Present 





Shear and Wood, 1909. 











Shear and Wood, 1907. 



Gleditsia triacanthos (honey 



locust). 

 Gossypium hirsutum (cotton) 

 Do 



do 







Do. 



do 







Do. 



...do 







Edgerton, 1908. 

 Edgerton, 1909. 



Shear and Wood, 1909. 



Do 





Present o n 

 bolls. 



Present 







Ligustrum vulgare (privet) . . . 



Do 



Malus sylvestris (apple) 



Do 



Present 



do 



do 



do 



do 



do. 





Stoneman, 1898. 

 Shear and Wood, 1909. 

 Clinton, 1902. 



On fruit and 



cankers. 

 On fruit 





Von Schrenk and Spaulding, 



1903. 

 Scott, 1906. 



Do 



do 





Do 



Do 



do 



do 



do 



do 





Shear and Wood, 1907. 

 Edgerton, 1908. 

 Shear and Wood. 



Mangifera sp. (mango) 





Present 





Maranta arundinacea 





do 





Shear and Wood, 1909. 



Maxillaria picta (orchid) 



Orchid 



Present 



Present o n 



leaves. 

 Present 





Stoneman, 1898. 





Edgerton, 1908. 



Oxycoccus macrocarpus 



(cranberry). 

 Persea gratissima (avocado). . 

 Phaseolus vulgaris (wax 



bean). 

 Phormium tenax 



Present 







Shear and Wood, 1907. 



do 



do 



Present 





Shear and Wood, 1909. 







Shear and Wood, 1907. 



do 







Shear and Wood, 1909. 



Pimenta acris (wild clove)... 



Piper macrophylla (pepper- 

 wort). 

 Pitcairnia corallina 



Present ; 

 sterile. 



Present 





Shear and Wood. 







Shear and Wood, 1907. 





Present 





Shear and Wood, 1909. 



Psidium guajava (guava) 



Do 



Present 





Present 



Sheldon, 1905. 







Shear and Wood, 1909. 



Ribes oxyacanthoides (goose- 

 berry). 

 Rubus occidentahs (black 



Present 







Shear and Wood. 



do 



do 



Present 





Shear and Wood, 1909. 



raspberry). 



berry). 

 Sarracenia purpurea (pitcher 



plant). 



Thea j aponica (camellia) 



Thea sinensis (tea) 







Stoneman, 1898. 





Present o n 



leaves. 

 Present 





Edgerton, 1908. 



Doubtful.... 

 Present 





Shear and Wood, 1909. 



do 



do 





Do. 



Theobroma cacao (chocolate 

 nut). 



Shear and Wood. 





do 





Stoneman, 1898. 



Vitis labrusca (Concord grape) 



Present 







Shear, 1907. 











VARIABILITY OF GLOMERELLA. 



The extreme variability of races of Glomerella from the same host 

 which is in some cases greater than that of forms from different 

 hosts renders it exceedingly difficult to make a satisfactory classifica- 

 tion of the forms. No character, either morphological or physiological, 

 seems to be well fixed. The appearance of the mycelium in cultures 

 on agar is usually rather uniform. The hyphae are mostly submerged 

 and white at first, forming a circular colony. After a short time the 

 mycelium frequently becomes dark greenish or smoke colored, and 

 occasionally a pink color develops, as was the case in the chromogenic 

 form obtained from the apple (p. 39). The dark color of the cultures 

 is sometimes due to colored hyphse and at other times to the presence 

 of the black perithecia or sclerotia and appressoria. 



252 



