Tanaka: New Japanese Fungi 



87 



reproductive organs of the fungus appear on the decayed por- 

 tion of the plant, giving it an appearance of powdery, fine fur. 



Phyllosticta (Phoma) Kuwacola K. Hara sp. nov. in Dainip- 

 pon Sanshi Kwaiho (Journ. Sericultural Association of Japan), 

 Tokyo, 26 304 : 390-391, T. 6, v, May 1917. (Japanese.) 



Spots amphigenous, first minute (the size of Sesamum seeds), 

 brownish, then increasing in size to 6-12 mm. diam., circular or 

 polygonal, sometimes irregular, rufous, finally cinereous with con- 

 centric zones and determinate margins, punctate with minute 

 black dots, mostly appearing on the upper surface of the spots ; 

 pycnidia sphaeroid or depressed sphaeroid, at first buried in the 

 matrix, finally sub-emergent, dark-brown, 60-100 /x diam. ; wall 

 fungoid-parenchymatous, cells 5-10 /x diam.; ostiola slightly 

 prominent or mammillate, later perforate ; pycnospores numerous, 

 ellipsoid, ovoid, cylindric or sub-fusoid, both ends rounded, nu- 

 cleate at both ends but sometimes not, hyaline, 4-6 X 2-3 ^ ; 

 sterigmata obsolete. 



On living leaves, shoots and twigs of Morus alba. 



Localities: Mino (Gifu-ken) and adjacent prefectures — the 

 annual damage seems to be considerable. 



The spots appear on the leaves and then gradually dry up, 

 becoming lacerate in dry weather and rotting in rainy weather. 

 When they appear on the margins of leaves, very frequently 

 semi-circular holes are made ; when two or more are formed close 

 together they coalesce, becoming irregular spots which sometimes 

 occupy considerable space on the leaf and cause the entire blade 

 to decay. Young twigs are also attacked and quickly change to 

 a brownish color and die, showing minute black pustules over 

 the surface. Hard twigs when attacked by the fungus display 

 rufous spots which later become blackish and sink considerably 

 below the level, showing much roughness and cracking on the 

 surface and finally causing the death of the upper part of the 

 twig. 



New Japanese name of the disease: Kuwa no Rinmonbyo 

 (circle blotch of mulberry). 



Phoma Mororum Berl. is the nearest to this species, but the 

 pycnospores in the former species are curved while in P. Kuwa- 



