324 COLEOSPORIUM 
Uredospores. Sori scattered, orange, at first covered by the 
epidermis, soon pulverulent; spores ovate or ellipsoid, densely 
and evenly verruculose, 21—34 x 14—2] p. 
Teleutospores. Sori forming little red crusts; spores pris- 
matic, length up to 100 yw, breadth 18—24 1; epispore up to 
14 thick at the summit. 
Aicidia on leaves of Pinus silvestris; uredo- and teleutospores 
on Petasites 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. 
DistTRisurion : Europe. 
4, Coleosporium Sonchi Lévy. 
Uredo Sonchi Pers. Syn. Fung. p. 217. 
Coleosporium Sonchi Lév. Ann. Sci. Nat. 1847, p. 373. Cooke, Handb. 
p. 521; Micr. Fung. p. 218, pl. 8, f. 178, 179. Plowr. Ured. 
p. 250 p.p. Sace, Syll. vii. 752. Fischer, Ured. Schweiz, p. 453. 
Peridermium Fischeri Kleb. Zeitschr. f. Pflanzenkr. v. 13, 
Spermogones 
Aycidiospores 
those of neighbouring species; spores ellipsoid or polygonal- 
roundish, verrucose, 25—32 x 18—25 wu. 
} fKcidia (P. Fischert) and spermogones like 
Fig. 244. C. Sonchi. On S. arvensis. Two chains of young uredospores ; 
teleutospore, showing fusion-nucleus ; and uredospore. 
