3<>X QYMNOSPOEANGIUM 



JEcidiospores. zEcidia hypophyllous, in irregular or circular 



groups, horn-shaped, conical, curved, 

 .1 nun. wide, 2 nun. long, at length 

 open and fimbriate above, yellowish- 

 brown, on round spots which are 

 brownish below, and bright-orange or 

 'xli red on the upper side; spores finely 

 verruculose, brown, 21 — 28x19 — 24/^; 



Pig. 233. G. Juniperi. germ-pores 8— 10, scattered. 

 Groups of reculia on leaflet ° J 



of Mountain Ash xih; Teleutospores. Spore-masses on 



"•: m anopened peridium young 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 — 52x21 — 30 /z, (Dietel), 



66 — 75 x 17 — 27 /x (Plowright); germ-pores one or two in each 



cell ; pedicels rather long. 



.Ecidia on Pyrus Aucuparia, July — October; teleutospores 

 on Juniperus communis. May and June. Not common: Surrey, 

 etc. iEcidia 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. Brcbner 

 infected a leaf of Mountain Ash from the teleutospores and obtained 

 spermogones in eleven days. 



Distribution : Europe, North America. 



4. Gymnosporangium Sabinae Wint. 



Tremella Sabinae Dicks. PI. Crypt. Brit. i. 14. 



Podisoma Sabinae Fr. : < 'ooke, Handb. p. 510 ; Micr. Fung. p. 214. 



Roeslelia cancellata Reb. Fl. Neom. p. 350. Cooke, Handb. p. 533 ; 



Micr. Fung. p. 193, pi. 2, f. 20, 21. 

 Gymnospora n <ji a in Sabi/iae Wint. Pilze, p. 232. Plowr. Ured. p. 230, 



pi. 4, f. 11, 12. Fischer, Ured. Schweiz, p. 394, f. 279. Sacc. 



Syll. vii. 739. Sydow, Monogr. iii. 51, f. 2&. 



Spermogones. Epiphyllous, on large yellow or orange spots, 

 very crowded, at length black. 



