ON' THE UREDINEAE PARASITIC ON TPIE JAPANESE GR AMINE AE. 213 
Honshü.— Prov. Echigo : Mt Tohö (I. Aug. 12, 1908. S. Irö). 
Distrib. Asia, Africa, Europe, America and Australia. 
REMARKS. The “ black rust,” as the present species is popularly called, 
was known from ancient times in several countries. Naturally the works on 
this species are numerous, but those cited above are the most important 
concerning its classification. 
In 1865, the zEcidium on Berberis was for the first time proved 
scientifically by DE BARY as a stage in the life cycle of this species. This is 
the beginning of our knowledge on heteroecism. J. ERIKSSON and E. 
HENNING (2) studied this species quite exhaustively and enumerated as its 
host- plant the names of 109 species of grasses. He (6) classified this species 
as the result of his own infection experiments into the following specialized 
forms : — 
1. f. sp. Secalis. 
2. /.sp. Tritici. 
3. f. sp. Avenae. 
4. f. sp. Airae. 
5. J- sp. Agrostis. 
6 . f. sp. Poae. . 
However, in North America, Cari.eton (t) found only the following 
two specialized forms well established ; namely, i.f. sp. Tritici and 2. f. sp. 
Avenae. 
In our country, barley, oats, wheat and Agrostis are known as the host- 
plants of this fungus. Especially wheat seems to be most severly attacked. 
25 . Puccinia kozukensis Diet., in Engl., Bot. Jahrb., 32 , 1903, (48); 
Sydow, Monogr. Ured., 1 , 1904, (721 ) ; Sacc., Syll., 17 , 1905, (379). 
Hab. On Andropogon micranthus Kth. 
Honshu.— Prov. Közuke : Mt. Myogi (III. Nov. 4, 1899. S. Kusaxo). — P rov. Hitachi (III. Oct. 
1 1, 1900).— Prov. Ugo: Akita (III. Nov. 1903. Y. Tokubuchi). 
Distrib. Japan. 
Remarks. As has been well remarked by Dietel (6), the present 
species is very easily distinguished from other species of Puccinia on 
Andropogon by the roundish form of its teleutospore, and also by the thinner 
epispore of its lower cell. 
