304 GYMNOSPORANGIUM 
GYMNOSPORANGIUM Hedvw. fil. 
Hetereecious. All the sori subepidermal. 
Spermogones spherical, with ostiolar filaments. Atcidia 
more or less elongated or tubular; peridium membranous, 
rupturing by lateral slits; spores brown, with numerous evident 
germ-pores, Teleuto-sori erumpent, naked, variously shaped, 
gelatinous, expanding when moist; spores with long pedicels, 
usually two-celled, generally with two pores (1—4) in each cell, 
mostly near the septa; the cell-wall of the pedicels becomes 
gelatinised. Germination by an ordinary basidium and roundish 
basidiospores: these are thrown off with a jerk, at maturity, 
like the spores of the Hymenomycetes (Coons, 1912). 
There are many species of Gymnosporangium in America 
(Kern in N. American Flora gives 32), of which only three 
occur in Europe, and one or two in Japan. Several of these 
have three, four, or five-celled teleutospores. The ecidia of the 
Gymnosporangia are on Rosacee (except one on Hydranges) ; 
the teleutospores are all on Cupressinese (Juniperus, Cupressus, 
Chamaecyparis, Libocedrus), on which they often form swellings, 
Le. galls. But we get also one remarkable exception to this 
rule in the autcecious species (the only one known) G. bermu- 
dianum, which produces both its ecidia and its teleuto-sori on 
Junipers (J. bermudiana and other species). 
1. Gymnosporangium clavarieforme DC. 
Tremella clavariaeformis Jacq. Collect. ii. 174. 
Podisoma Junipert Fr. ; Cooke, Handb. p. 510; Mier. Fung, p. 214. 
Roestelia lacerata Tul. ; Cooke, Handb. p. 534; Micr. Fung. p. 193, 
pl. 2, £. 226. 
R. carpophila Bagnis, Flora, 1xiii. 317. 
Gymnosporangium clavariaeforme DC, Flor. fr. ii. 217. Plowr. Ured. 
p. 233. Fischer, Ured. Schweiz, p. 383, f. 275. Sacc. Syll. vii. 
737 p.p. Kern, in North Amer. Fl. vii. 202. Sydow, Monogr. 
iii. 59, f. 29, 
Spermogones. Numerous, amphigenous, but chiefly epi- 
phyllous, in little clusters on red spots, yellow, then dark-brown. 
