KERN: JAPANESE SPECIES OF GYMNOSPORANGIUM 249 



Tremella koreaensis Arth. Proc. Indiana Acad. Sci. 1900: 136. 



1901. 

 Gymnosporangium asiaticiim MIyabe, Bot. Mag. Tokyo 17-: 34. 



1903. [Hyponym] 

 Gymnosporangium Haraeanum Sydow; H. & P. Sydow, Ann. Myc. 



10: 405. 1912. 

 Gymnosporangmm chine?ise [''is''] Long, Jour. Agr. Research 1: 



354- 1914- 



I. Aecia with rugose peridial cells, on Cydonia vulgaris (L.) 

 Pers., Cydonia japonica (Thunb.) Pers., and Pyrus sinensis LIndl, 



III. Telia with spores 35-50 /x long, on the leaves and green 

 twigs of Juniper us chinensis L. 



I to in the paper already cited remarks that if we accept names 

 according to priority G. japonicum would become G. Photiniae 

 and G. Haraeanum would be changed to G. koreaense. He states, 

 however, that he is retaining the old names. An interesting 

 problem in nomenclature is presented by such provisional trans- 

 fers. There are other similar cases on record. 



In the account of the genus Gymnosporangium in the North 

 American Flora, vol. 7, the species G. japonicum was included as 

 no. 21, p. 201, and the error of associating R. koreaensis was 

 continued there. The species was included because it was known 

 to have been imported into America.^ Every effort was made to 

 stamp it out and it probably did not become established. There 

 is the same basis for including G. koreaense in such a descriptive 

 account.- It should be inserted among the forms appearing on 

 leaves or leafy twigs. It might well follow G. fraterjtum, from 

 which it could be separated by the teliospores being not or only 

 occasionally thickened at the apex, whereas they are uniformly 

 thicker above in G. fraternum. 



Having determined that there is a caulicolous form, G. Pho- 

 tiniae, on Juniperus chinensis with aecia on Pourthiaea and 

 Cydonia, and a foliicolous form, G. koreaense^ on the same host 



1 Since this paper was prepared two other importations of this species have come to 

 the attention of the writer, one collected by F. N. Rhodes, Seattle, Washington, im- 

 ported from Yokohama, Japan, the other collected by J. W. Hotson on the campus of 

 the University of Washington, Seattle, Wash., both in May, 1915. 



2 Recently (Feb. 28, 1916) Professor H. S. Jackson has reported in the Journal of 

 Agricultural Research (5: 1003-1009) the complete establishment of this species in 

 Oregon, and has referred to incomplete evidence of its establishment in California. 



