ioo6 
Journal of Agricultural Research 
Vol. V, No. 23 
These results, the writer believes, confirm the opinion regarding genetic 
relationships expressed by Ito and the culture work of Miyabe and 
Yamada and of Hara, referred to above. They also serve as additional 
evidence that Shirai’s successful infections were obtained with the leaf 
form rather than with the branch form. 
So far as the writer is aware, this is the first record of the complete 
establishment of any introduced species of Gymnosporangium in this 
country, though incomplete evidence of the establishment of the same 
species in California was brought to his attention through a specimen 
of Roestelia koreaensis found in the Arthur herbarium and collected on 
Pyrus sinensis at Oakland, Cal., July i, 1913, and communicated by 
Prof. H. S. Fawcett, of the California Experiment Station. Corre¬ 
spondence with Prof. Fawcett and Prof. W. T. Horne, also of the 
California Experiment Station, revealed that the specimens came from a 
nursery conducted by Japanese, and that among other things various 
oriental evergreens were grown. The pears were said to have been 
originally imported from France in the dormant condition. The pres¬ 
ence of this fungus on the leaves of the pears under the conditions is 
proof that the telial stage must have occurred on some species of Junip- 
erus in the immediate vicinity, though no observations or collections 
were made. It is evident from this that the rust was at least tem¬ 
porarily established in California at that time. 
TAXONOMIC CONSIDERATION 
Based upon the results of the infection experiments discussed above, 
together with the evidence presented in the literature and such studies 
as the writer has been able to make with the material available in the 
Arthur herbarium, the present status of the species under discussion is 
believed to be as follows: 
Gymnosporangium koreaense (P. Henn.), n. comb. 
Roestelia koreaensis P. Henn., 1899, in Warburg, Monsunia, v. i, p. 5. 
Tremella koreaensis Arth., 1901, in Proc. Ind. Acad. Sci,, 1900, p. 136. 
Gymnosporangium asiaticum Miyabe, 1903, in Bot. Mag. [Tokyo], v. 17, no. 192, p. (34). (hyponym) 
Gymnosporangium Haraeanum Syd., 1912, in Ann. Mycol., v. 10, no. 4, p. 405. 
Gymnosporangium chinense Long, 1914, in Jour. Agr. Research, v. 1, no. 4, p. 353. 
Pycnia and secia on Pomaceae: Cydonia vulgaris Pers., reported from Japan and 
cultured by Miyabe and Yamada; and from Oregon, cultured on June 3, 1915, by 
H. S. Jackson. Cydonia japonica Pers., reported from Japan and cultured by Miyabe 
and Yamada. No specimens seen. Pyrus sinensis , reported from Korea and Japan. 
(Part of type of R. koreaensis , examined.) Cultured in Japan by Sliirai, Miyabe and 
Yamada, and by Hara. Occurred naturally at Orient, Oreg., on June n, 1914 (H. S. 
Jackson), and at Oakland, Cal., on July 1, 1913 (H. S. Fawcett). Cultured at Cor¬ 
vallis, on Oreg., June 3,1915, by H. S. Jacksoh. 
Telia on Juniperaceae: Juniperus chinensis t reported from Japan (part of type of 
G. Haraeanum , examined) and from United States in a nursery at Westville, Conn., 
on stock just imported from Japan on March 28, 1911, by G. P. Clinton (type of G. 
chinense , examined), and from Orient, Oreg., on March 29, 1915, by H. S. Jackson.. 
