Coleosporium. 249 



young branches, producing fusiform swellings from the perennial 



mycelium. Pseudoperidia larger, crowded, whitish, saccate, 



mouth patent, widely torn, 5-6 mm. broad, 2 '5-3 mm. high. 



Spores orange, spherical or ovate or angular, coarsely and 



thickly verrucose, 30-40 X 18-30/x. 

 Uredospores — Sori orange, small, scattered, soon pulverulent 



Spores in short chains, elliptical, ovate, or almost cylindrical, 



epispore densely verrucose, 20-30 x 15-25/A. 

 Teleutospores — Sori at first orange, then forming red crusts. Spores 



cylindrical or clavate, consisting of about four superimposed 



cells, dark orange-red, 90-110 x 17-30//. 



Syno7iy)ns. 



Winter, loc. cit., p. 248. Schrot., loc. cif., p. 367. 



Uredo farinosa, var. senecionis. Pers., " Syn.," p. 218. 



yScidium pi?ii, Pers. Berk., " Eng. Flor.," vol. v. p. 374. 

 Grev., t. 7 ; " Flor. Edin.," p. 444. 



Peridermuun piiii, Chev. Cooke, " Hdbk.," p. 535 ; " Micro. 

 Fungi," 4th edit., p. 191, t. ii. figs. 27, 28. 



Peridertnmm acicolian^ Link. Cooke, " Micro. Fungi," 4th 

 edit., p. 191. 



Puccinia glomerata (uredospores). Cooke, " Hdbk.," p. 500. 



Uredo senecionis, Schlecht. Berk., "Eng. Flor.," vol. v. p. 379. 

 Grev., "Flor. Edin.," p. 438, Johnst., "Flor. Berw.," vol. ii. 

 p. 198. 



TricJiobasis senecionis. Berk., " Outl.," p. 322. Cooke, " Micro. 

 Fungi," 4th edit., t. vii. figs. 145, 146. 



Coleosporium senecionis, Fries. Cooke, " Micro. Fungi," 4th 

 edit., p. 218, t. vii. figs. 145, 146. 



Exsiccati. 

 Cooke, i. 66; ii. 53. Vize, " Micro. Fungi Brit," 20. 



-^cidiospores on the leaves and on the young branches of 

 Piniis sylvestris, austriaca, May and June. 



Uredospores and teleutospores on Senecio vidgaris, viscosus, 

 sylvaticus, zxidijacobcea, all the year. 



Biology. — The connection between Coleosporium senecionis and 

 Peridermiitm pini was first demonstrated by Wolff in 1872. He first 



