ox THE UKEmXEAF. PARASITIC ON THE JAPANESE GRAMIXBAE. 213 



Honshu. — Prov. Echigo : Mt Toho (I. Aug. 12, 1908. S. Irö). :^-> 



Distrib. Asia, Africa, Europe, America and Ausfralia. 



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 yEcidium on Bcrberis 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. Sccalis. 



2. f. sp. Tritici. 



3. f. sp. Avcnac. 



4. f. sp. Airae. 



5. /. sp. Agi-ostis. 



6. /. sp. Poae. 



However, in North America, C.ARI.ETOX (ij found only the following 

 two specialized forms well established ; namely, \.f. sp. Tritici Sii\d 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 niicrantlius Kth. 



Honshu.— Prov. Közuke : Mt. Myogi (III. Nov. 4, 1S99. S. KusAxoj.-^Prov. Hitachi (III. Oct. 

 II, 1900).— Prov. Ugo: Akita (III. Nov. 1933. \'. Tokubuchi). 



Distrib. Japan. 



Rem.^RKS, 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. 



