149 Mycologia 



shorter, pointed, lower cell sometimes attenuate, mostly rounded, 

 2-nucleate in each cell. 13-17X4-5/^, hyaline, colorless. 



On leaves of Colocasia antiqnoruui. 



Type locality: Not given. Probably Main Island (Honshu), 

 Japan. 



Spots solitary or confluent, at first round, testaceous brown, 1.5 

 mm. across, finally increasing to 6-30 mm., concentrically zoned 

 and more or less sunken from the surface level, with dark brown 

 margin and broad surrounding area of the same color; perithecia 

 appear on the upper surface of the spots.. When the diseased 

 spots reach full maturity they can be seen from the lower surface 

 of the leaf and appear light brownish with dark green margin. 



The disease is frequently observed when the host plants are 

 cultivated in damp soil and the first symptoms show during the 

 hottest season. The disease greatly decreases the crop as the 

 tubers cannot grow to the usual size. 



For protection against this disease Bordeaux mixture should be 

 used twice or three times in early summer, and if the diseased 

 leaves can be found they should be carefully collected and buried 

 underground with lime. Also avoid cultivation on low, damp soil. 



Valsa Mali Miyabe et Yamada ex M. Miura in Noji Shiken 

 Seiseki (Agricultural Experiment Station lUilletin) Aomori- 

 ken, Japan, No. 15: 117-141. ph. 1-3, T. 4, ix, Nov., 1915. 

 (Japanese.) 



Hyphae septate, hyaline or very pale olivaceous, intercellular, 

 2-4 /x across ; stromata cortical, punctiform or wart-like, of various 

 sizes (1-3 mm. diam. in cultures), no definite border to the host 

 substratum, black, hyphae slate-black to black ; pycnidia deeply 

 immersed at the center of a stroma, flask-shaped, opening with a 

 slender canal-like neck, 80-200 ^u, diam., circumscribed by black 

 walls ; pycnospores expelled as thread-like bufif tendrils which at 

 maturitv are readily disseminated by water ; cylindrical or allan- 

 toid, obtuse at both ends, /-ioXi-I-Sm- homogeneous inside, 

 hyahne ; perithecia circinate surrounding the pycnidial cavity, 

 flask-shaped, long-necked, with black walls, of various sizes, 

 100-250 /x diam. :, asci numerous, clavate, often pedicellate, 20-30 X 

 5-8 /x, hyaline, octosporus, aparaphysate ; ascospores cylindrical, 

 slightly curved, continuous, nearly as large as pycnidia, hyaline, 

 agranulate. 



