282 puccinia 



usually truncate above and thickened (up to 6fi), gently con- 

 stricted, attenuated downwards, smooth, pale-brown, darker at 

 the apex, 40 so, ll -22/*; pedicels very short, persistent, 



somewhat hyaline, with a dark-brown band at the apex.] 



.Kridi.-, on Clematis Vitalba, May— July: [uredo- and teleuto- 

 spores on species of Triticum (Agropyron), but not recorded as 

 ye1 for Britain]. (Fig. 213.) 



Dietel first showed, by culture experiments, that tlic secidium on 

 Clematis Vitalba is connected with a Puccinia on Triticum glaucum. 

 In Europe the Eecidium is frequently observed (probably because of the 

 striking distortions it produces), but the Puccinia has been far more 

 rarely noted, being by no means conspicuous in its appearance. According 

 to Sydow, it occurs also on Triticum junceum and T. repens, on which it 

 may presumably be found in this country, if looked for. 



The statement of Rathay, that JEcidium Clemati<l'<* belongs to a 

 Melampsora on Poplar, is now universally discredited. It has been 

 observed on many (nineteen) species of Clematis^ but it must be noted, as 

 remarked by Sydow, that the genus Triticum is also very widely distributed. 



According to Fischer, the teleutospores are often accompanied by 

 brown paraphyses, which subdivide the sori into smaller compartments, 

 something like what obtains in P. dispersa and P. persistem. Other 

 authors have not found the paraphyses, but they are easily overlooked ; 

 abnormal three-celled teleutospores are recorded. Probably more than 

 one species has been included under the name. P. agropyrina Eriks. 

 is distinctly different. 



Distribution: Europe, North and South America, Turk- 

 estan, Japan, Australia. 



134. Puccinia persistens Plowr. 



JEcidium Ranunculacearum var. Thalictri Cooke, Handb. p. 540. 

 Puccinia persistens Plowr. Ured. p. 180. Sac-. Syll. ix. 312. Sydow, 

 Monogr. i. 825. Fischer, Ured. Schweiz, pp. 347. .>5f>, f. 2.">4. 



Spermogones. Epiphyllous, in little clusters, orange. 



jEcidiospores. ^Ecidia hypophyllous, in clusters on thick- 

 ened spots which are purple-brown above and yellow with a 

 brownish border below, urn -shaped or subcylindrical, yellow, 

 with a torn white margin ; spores minutely verruculose, orange, 

 U_28^. 



