308 GYMNOSPORANGIUM 
Aeidiospores. Aicidia hypophyllous, in irregular or circular 
groups, horn-shaped, conical, curved, 
Ve 4mm. wide, 2mm. long, at length 
a open and fimbriate above, yellowish- 
ie brown, on round spots which are 
brownish below, and bright-orange or 
x red on the upper side; spores finely 
verruculose, brown, 21—28 x 19—24u; 
Mig 2c gig ais gern-pres 8—10, sntered 
of Mountain Ash x14; Teleutospores. Spore-masses on 
ve unopened peridium sung twigs and occasionally on leaves, 
more or less globose, 1—3 mm. across, 
at first chocolate-brown, then orange, soft, gelatinous; spores 
obtusely fusiform, of two kinds, first thick-walled and brown, 
second thin-walled and yellowish, 31—52 x 21—30 yw (Dietel), 
66—75 x 17—27 w (Plowright); germ-pores one or two in each 
cell; pedicels rather long. 
Zcidia on Pyrus Aucuparia, July—October ; teleutospores 
on Juniperus communis, May and June. Not common; Surrey, 
etc. /Ecidia very abundant at Blair Athol, August, 1905 
(D. Prain). (Fig. 233.) 
The teleutospores differ from those of the other European species in 
the possession of a broad colourless papilla over each germ-pore. Their 
mycelium causes fusiform swellings of the smaller branches. Brebner 
infected a leaf of Mountain Ash from the teleutospores and obtained 
spermogones in eleven days. 
DistRiBuTION: Europe, North America. 
4. Gymnosporangium Sabine Wint. 
Tremella Sabinae Dicks. Pl. Crypt. Brit. i. 14. 
Podisoma Sabinae Fr.: Cooke, Handb. p. 510; Micr. Fung. p. 214. 
Roestelia cancellata Reb. Fl. Neom. p. 350. Cooke, Handb. p. 533 ; 
Micr. Fung. p. 193, pl. 2, f. 20, 21. 
Gymnosporangium Sabinae Wint. Pilze, p. 232. Plowr. Ured. p. 230, 
pl. 4, f. 11, 12. Fischer, Ured. Schweiz, p. 394, f. 279. Sace. 
Syll. vii. 739. Sydow, Monogr. iii. 51, f. 26. 
Spermogones. Epiphyllous, on large yellow or orange spots, 
very crowded, at length black. 
