310 THE BOTANICAL MAGAZINE. [Vol. xxx. No. aw. 



pycnospores of the present fungus before germination is not so 

 gt-eat as in the case of Valsa japonica.'^^ They are not septated 

 before germination, as I noticed in the study of Valsa japonica. 



From the characters of the pycnidia and the pycnospores, 

 we ma}' recognize our fungus to be a species of Cytospora. But 

 such an unh)bed, and deprcssedh- globose pycnidium and such jl 

 peculiar flask shaped stroma are not common to this genus. 



Perithecia, Asci and Ascosporcs. The perithecia are subglo- 

 bose in shape each provided with a long neck. There are about 

 fifteen perithecia in a stroma, but the number varies greatly. 

 The bodies of the perithecia arrange themselves compactly form- 

 ing the base of a stroma. Apices of long necks of the perithecia 

 project to a greater or less extent above the exposed surface of 

 the stroma as black minute papillae. Rarely the projecting por- 

 tion of the neck of the perithecia is so long as to appear to be 

 a long black thread. The perithecial wall is black and firm, and 

 its neck also has commonly the black wall which is distinctly 

 differentiated from the tissue of the stroma. But there are 

 sometimes cases in which the lower portion of the neck is not 

 evidently differentiated from the stroma. The perithecia measure 

 about 150 to 300 ^a in diameter. The length of the neck varies 

 with the luxuriance of the stroma, but in general it is 2 or 3 

 times the diameter of the body. 



When mature the cavity of the perithecium is filled with 

 asci, each containing eight allantoid spores. The asci arc c\-lin- 

 drical or clavate, more or less curved and subsessile or short 

 stalked, measuring 32-52 x 8-10/^ (commonly 44 x 8.8/i). 

 The wall of the ascus is hyaline £ind more or less thickened at 

 the tip. Usually the asci soon dissolve themselves \\hile they 

 are in the perithecia. In consequence, it often happens that the 

 whole perithecial cavity is filled with the spores presenting on 

 appearance of a pycnidium. 



The ascospores are arranged in an ascus mostly bi.'^eriateh-, 

 sometimes irregularly or rarely uni^eriateh'. They are allantoid 

 in shape with rounded ends, and are In^aline, becoming some- 

 times slightly darker. The\' measure about 10-18 x 2-4// 

 (commonly 14-16 x 3.2 /i) ; and their contents are homogeneous. 



