370 PLANT DISEASES 



papillate, about i mm. diam.. smooth ; asci cylindrical or 

 subclavate, base narrowed, 160-170x8-10 /*, 8-spored ; 

 spores obliquely i-seriate, fusoid, guttate, both ends acute, 

 brown, 28 x 6-7 /*. 



Rosellinia ligniaria, Nits., Fuckel's Symb. Myc., 150 (1869- 

 70). Perithecia gregarious, globoso-conic, superficial, black, 

 sparingly covered with minute hairs, J mm. diam. ; asci 

 cylindrical, stipitate, 8-spored, 80-96x10-12 //, ; spores 

 obliquely i-seriate, ends obtuse, blackish-brown, continuous, 

 16x8 //. 



Rosellinia necatrix, ^>^\. Dematophora necatrix, Hartig. 

 Perithecia densely gregarious, seated on a byssus or 

 subiculum, obovate, blackish, nearly 2 mm. diam., surrounded 

 at the base by fascicles of conidiophores ; asci cylindrical, 

 8-spored ; spores fusiform, often inaequilateral, continuous, 

 brown, 40 X 7 /* ; paraphyses filiform ; conidiophores spring- 

 ing from small black sclerotia, fasciculate, branched ; conidia 

 elliptical, hyaline, 2-3 /x long; pycnidia springing from 

 sclerotia, black, subglobose; stylospores hyaline, elliptical, 

 continuous, or 1-3 celled, averaging 25X8 ft. 



Rosellinia radiciperda, Massee, Kew BitlL, 1896, p. i, 

 i pi. Ascophores densely gregarious, seated on a black, 

 velvety byssus, globoso-depressed,mamillate, black, glabrous, 

 large; asci cylindrical, apex truncate; spores 8, i-seriate, 

 elliptic-fusiform, slightly inaequilateral, continuous, brown, 

 40-45X12. /x; paraphyses filiform; pycnidia globose- 

 depressed, sparingly pilose, black, stylospores elliptic-oblong, 

 continuous, hyaline, continuous, 7-8 X 4-5 /* ; conidiophores 

 springing in fascicles from small black sclerotia, much 

 branched at the apex ; conidia terminal on the branchlets, 

 hyaline, continuous, elliptic-oblong, 7 X 4 /*. 



