Gymnosporangium. 235 
spore mycelium, while the teleutospores only require two or three 
weeks in which to perfect the mycelium bearing the ecidiospores. 
The germ-tubes of the aécidiospores will not enter old leaves, but 
only those produced the same year the experiment is made; or, if 
they do enter the former, the mycelium will not penetrate into the 
perennial tissues of the host-plant. Hence it is useless attempting to 
infect a bush which has recently been transplanted ; but there is no 
difficulty with an established plant, which has thrown out a number of 
young leaves. Once established in the juniper, the mycelium lives in 
a vigorous condition, annually producing teleutospores for many years. 
Gymnosporangium juniperinum. (Linn.) 
:cidiospores—Pseudoperidia on orange or red, roundish spots, 
cylindrical, curved, yellowish brown, 8-10 mm. long, open 
above, fimbriate. Spores subglobose, brown, finely verrucose, 
21-28 X I19-24p. : 
Teleutospores—Mycelium perennial. Spore-masses at first dark 
brown, then orange, soft, gelatinous, subglobose. Spores of 
two kinds: (1) fusiform, brown, with thick epispore, 75 X 27h; 
(2) yellow, with thinner epispore, about 66X17p, having 
six germ-pores. 
Synonyms. 
Winter, Joc. cét., p. 234. 
Tremella juniperina. WLinn., “Sp. Plant.,” p. 1625. 
Gymnosporangium junipert, Link. Berk., “Eng. Flor.,” vol. v. 
p. 361; “Out,” t. ii fig. 2. Cooke, “ Hdbk.,” p. 509; “ Micro. 
Fungi,” 4th edit., p. 214. 
cidium cornutum, Pers. Berk., “ Eng. Flor.,” vol. v. p. 373. 
Johnst., “ Flor. Berw.,” vol. ii. p. 207. Sow., t. 319. Grev., t. 180; 
“Flor. Edin.,” p. 447. 
Restelia cornuta, Tul. Cooke, “ Hdbk.,” p. 534; “ Micro. 
Fungi,” 4th edit., p. 190, t. ii. figs. 18, 19. 
LExsicatt. 
Cooke i, 1; ii, 441. Vize, “Micro, Fungi Brit.,” 54. 
fEcidiospores on Pyrus aucuparia, July to October. 
Teleutospores on Juniperus communis, May to June. 
BioLocy.—The teleutospores do not generally appear until May. 
They readily produce promycelial spores in water, which, when applied 
