324 



C< >LEOSPORIUW 



Uredospores. Sori scattered, orange, at first covered by the 

 epidermis, soon pulverulent : spores ovate or ellipsoid, densely 

 and evenly verruculose, 21 — 34 x 14 — 21 p. 



Teleutospores. Sori forming little red crusts; spores pris- 

 matic, 1 « ■ i i ■_; 1 1 i up to 100 (x, breadth IS — 24^: epispore up to 

 14^ thick at the summit. 



Jv-idia on loaves of l'i ims sih-,- s t ,-is\ uredo- and teleutospores 

 on Peta&ites officinalis, August — November, not uncommon. 



The life-cycle has been demonstrated by Fischer and Wagner for 

 P. officinalis : the parasite may also extend to other species of Petasites. 



Distribution : Europe. 



4. Coleosporium Sonchi Lev. 



Credo Sonchi Pers. Syn. Fung. p. 217. 



Coleosporium Sonchi Lev. Ann. Sci. Nat. 1847, p. 373. Cooke, Handb. 



p. 521 ; Micr. Fung. p. 218, pi. 8, f. 178, 179. Plowr. TJred. 



p. 250 p.p. Sacc. Syll. vii. 752. Fischer, Ured. Schweiz, p. 453. 

 Peridermium Fischeri Kleb. Zeitschr. f. Pflanzenkr. v. 13. 



JLcidia (P. Fischeri) and spermogones like 



S per i nog ones 



uEcidiospores 



those of neighbouring species : spores ellipsoid or polygonal- 

 roundish, verrucose, 25 — 32 x 18 — 25 /x. 



Fig. 244. C. Sonchi. On S. arvensis. Two chains of young uredospores ; 

 teleutospore, showing fusion-nucleus ; aud uredospore. 



