284 THE FUNGI WHICH CAUSE PLANT DISEASE 



top-shaped, with papillate ostioles and usually projecting, some- 

 times practically superficial. Few to many in a stroma and usually 

 interspersed among pycnidia; 175-250 ii in width. Asci clavate, 

 80-120 X 17-20 II, and with numerous filiform paraphyses. 

 Spores fusoid, continuous, hyaline, 16-23 x 5-7 /x. 



Pycnidia of the compound stylosporic form, Dothiorella, are borne 

 in the same or similar stromata; spores fusoid, continuous, hyaline,. 

 18-31 X 4.5-8 IX. Pycnidia of the simple stylosporic form, Macro- 

 phoma, are embedded in the outer bark under the much-raised 

 primary cortex of young shoots, depressed globular, 175-250 mm. 

 wide; spores fusoid, hyaline, continuous, 16-25 x 4.5-7.5 m- 



The cause of a blight of canes of currants. 



The fungus was first noted in sterile form by Fairchild.^ Its 

 history was first fully worked out by Grossenbacher & Duggar.^* 

 Extensive inoculation experiments and pure cxilture studies de- 

 finitely estabUshed its pathogenicity. 



B. dothidse Ces. & d. Not. causes epidemics of disease among 

 cultivated roses.** 



B. gregaria Sacc. is injiuious on willows in Europe.®* 



Melanops Fuckel (p. 283) 



Stroma lens-shaped, black; perithecia sunken; asci elongate, 

 8-spored; spores elongate, 3-celled, hyaline; paraphyses elongate, 

 brown. 



According to Shear, '^® the conidial stage of some members of 

 this genus is a Sphaeropsis which is indistinguishable from S. vitic- 

 ola and S. malorum. 



Melogramma henriquetii Br. & Cav. is parasitic on cork oak. 



Xylariaceae (p. 224) 



Stroma variable, usually free but often more or less sunken in 

 the matrix, either upright and often branched or horizontal, ef- 

 fused, crustaceous, pulvinate, globose or hemispheric, black or 

 becoming black, usually woody or carbonous; perithecia periph- 

 eral, inmiersed, leathery or carbonous, black; asci cylindric or 

 cylindric-clavate, 8-spored; spores continuous, brown or black, 

 fusiform or eUipsoid, paraphyses present or absent. 



A fainily of over five hundred species. 



