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JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



whitish, with the mouth spreading and much torn (5-6 mm. broad). 

 The flpcidiospores are spherical or angular by compression, of an orange 

 colour, and coarsely and thickly warted (30-40 x 18-30 ft). 



The remaining stages of this parasite are affirmed to be passed upon 

 the leaves of different species of Ragwort, as Senecio vulgaris, viscosus, and 

 Jacobcea, and has generally been known as Coleosporium senecionis. 



Recorded also in France, Belgium, Netherlands, Germany, Russia, 

 Bohemia, Hungary, Transylvania, Switzerland, Italy, Asiatic Siberia, and 

 North America. 



Sacc. Syll. vii. 2633 ; Plow. Br. Ured. p. 249 ; Cooke, Hdbk. No. 1600 ; 

 Cooke, M.F. p. 191, t. ii. f. 27, 28 ; Hart, tf- Som, Dis. Trees, p. 172, 

 fig. 102 ; Marshall Ward, Timbers dc. p. 256, fig. 37-39. 



Pine Witches' Broom. 

 Pcridermium elatinum (A. & S.), PI. XXI. fig. 47. 



This parasite produces on the branches of Pitms Pinea that peculiar 

 form of distortion known as Witches' Broom. The mycelium causes 

 fusiform swellings in the branches affected, from which arise the deformed 

 shoots, bearing pale green swollen leaves. 



The cups are whitish, opening irregularly. iEcidiospores elliptical or 

 angular, coarsely warted (16-30x15-17 /u). 



Known in Germany Belgium, Hungary, and North America. 



Sacc. Syll. vii. 2932 ; Ploior. Br. Ured. 271 ; Cooke, Hdbk. No. 1601 ; 

 Cooke, M.F. p. 104; Hart. & Som. Dis. Trees, p. 179, figs. 109, 110, 

 111. 



Silver Fir Cluster-cups. 

 JEcidium pseudo - columnar e (Kuhn), PI. XXI. fig. 48. 



This is the species which has been known in this country as Peri- 

 dermium columnare, but which Dr. Plowright affirms is not that species, 

 but another which is known by the above name. It occurs on Abies 

 pectinata, Nordmanniana, amabilis, and cephalonica, as well as on 

 Spruce. 



The cluster-cups appear in two rows on the under side of the affected 

 leaves, which are not otherwise altered, except that they are paler in 

 colour. They are either spherical or elongated, with the edges irregularly 

 torn. ^Ecidiospores white, finely warted, ovate or long elliptical, some- 

 times irregular, angular, and even triangular in section (33-37 x 18-25 /u). 



Recorded for Germany and Britain. The teleutospore condition is 

 known as Melamspora Gocppertiana. 



Sacc. ShII. vii. 2987 ; Plowr. Br. Ured. p. 271 ; Cooke, Hdbk. No. 

 1602 ; Cooke, M.F. 194, figs. 27, 28. 



Pine Branch Twist. 

 Cceoma pinitorquum (Br.), PI. XXI. fig. 50. 



This disease is prevalent throughout Germany, often attacking Pine 

 seedlings. The infection is said to be caused by the teleutospores of 



Me lam psora t re m u la. 



