Feb. 28,1916 
An Asiatic Species of Gymnosporangium 
1007 
Gymnosporangium asiaticum Miyabe is included here on the authority 
of Ito (4). Regarding G. chinense , the writer, after comparing portions 
of the original collection of this with a specimen of the type collection 
of G. Haraeanum , is inclined to agree with Clinton (2) that they should 
not be separated. Long (5) gives us the most important basis for 
separating G. chinense from G . Haraeanum , the presence of a single 
apical pore in the upper cells of the former species, found rarely in the 
thick-walled form, but more commonly in the thin-walled form. He 
states that in the latter there are two pores in the upper cells always 
occurring near the septum. A careful examination of a portion of the 
original collection of G. chinense in the Arthur herbarium shows that 
apical pores occur rarely, even in the thin-walled form, and in every 
case observed there was a second pore near the septum. The same 
condition was observed in the type material of G. Haraeanum , though 
rarely. The collection of the writer, made in Oregon, also shows the 
same condition, but with the apical pores more abundant in the thick- 
walled form. In all of the collections examined spores were occasionally 
found in which one of the pores in the upper cell occurred at or near 
the septum and the other at a point from one-third to one-half the 
distance from base to apex. The other differences mentioned by Long 
are largely, the writer believes, due to variation and are not sufficient 
to justify separation. 
Gymnosporangitun photiniae (P. Henn.) Kern, 1911, in Bui. N. Y. Bot. Gard., v. 7, 
no. 26, p. 443. 
Roestelia photiniae P. Hetrn., 1894, in Hedwigia, Bd. 33, Heft 4, p. 231. 
Gymnosporangium japonicum Syd., 1899, m Hedwigia, Beibl., Bd. 38, No. 3, p. (141). 
Pycnia and aecia on Pomaceae: Pourthiaea villosa reported from Japan, cultured 
successfully by Ito. 
Telia on Juniperaceae: Juniperus chinensis , reported from Japan and from United 
States in a nursery at Westville, Conn., on stock just imported from Japan, March 28, 
1911, by G. P. Clinton, and at Seattle, Wash., May 19, 1915, by J. W. Hotson. 
ECONOMIC IMPORTANCE 
Little is known concerning the economic status of the species under 
discussion. It may be said, however, that any fungus introduced from 
a foreign land is an unknown quantity and should be treated with sus¬ 
picion until its status has been established. Several of the American 
species of Gymnosporangium are already of considerable economic 
importance, notably G. juniperi-virginianae Schw. in the eastern United 
States and G. Blasdaleanum (D. and H.) Kern in the Pacific States. 
Gymnosporangium koreaense has been shown to have its aecial stage 
on the cultivated quince and the Japanese pear. While attempts to 
infect Pyrus communis were unsuccessful, it should be pointed out that 
only a single attempt was made and it is reasonable to expect that cer¬ 
tain varieties of pears, particularly those derived directly or by hybridi- 
