CORYNEUM 



455 



other causes also are capable of causing gummosis. I have 

 shown that in one instance the production of large quantities 

 of gum was due to the presence of Cladosporium epiphyllum. 



In October Vuillemin noted the presence of pycnidia on 

 the dead patches formed by Coryneum on the shoots. To 

 these he gave the name of Phyllosticta beyerinckii (=Phyl- 

 losticta persicae, Sacc.). The same author also observed in 

 the spring months perithecia nestling amongst the pycnidia 

 seated on old Coryneum scars on mummified cherries that 



FlG. 139. i, Coryneum beyerinckii ; 2, Cycloconium oleaginum on olive 

 leaf; 3, fungus of same ; 4, Scoletotrichum melophthornm ; 5, Trichothecium 

 roseum ; 6, Acremoniella occulta ; 7, Ophiocladium hordei ; 8, Meria laricis ; 

 9, basidia and spores of same. All except Fig. 2 highly mag. 



had remained hanging on the tree throughout the winter. 

 These perithecia were considered by Vuillemin as constituting 

 the perfect form of fruit of Coryneum, and received the name 

 of Ascospora beyerinckii (^=Asterula beyerinckii, Sacc.). 



The relationship of the three forms mentioned above has 

 not been established by means of cultures, but rests on their 

 successive appearance on the same scar. Future research is 

 required to definitely settle this point. 



Coryneum form. Crowded, short conidiophores spring 

 from a minute stroma situated under the epidermis. Each 



