COLEOSPORIUM 325 



Uredospores. Sori small, round or oblong, girt by the 

 epidermis, in irregular groups, especially along the veins, 

 yellowish-orange ; spores roundish-oval, densely and finely 

 verruculose, 18 — 25 x 15 — 21 /z. 



Teleidospores. Sori forming small, flat, roundish, waxy-red 

 crusts ; spores prismatic, length reaching 100 fi, breadth 18 — 

 30 fi ; epispore at summit reaching 18 p, thick. 



^Ecidia on leaves of Piiuts silvestris; uredo- and teleuto- 

 spores on Sonchus arvensis, 8. asper, S. oleraceus, August — 

 November, not uncommon. (Fig. 244.) 



Klebahn, Fischer, and AVagner have demonstrated the life-cycle of this 

 parasite; the two former have also proved that it cannot be transferred to 

 Cacalia, Campanula, Senecio, or Tussilago. Fischer records this species 

 on Sonchus palustris as well as on the hosts given above. 



Distribution: Europe. 



5. Coleosporium Cacaliae Fckl. 



Uredo Cacaliae DC. Flor. fr. vi. 65. 



Coleosporium Cacaliae Fckl. Synib. Myc. p. 43. Cooke, Micr. Fung. 

 p. 218. Fischer, Ured. Schweiz, p. 446. 



C. Sonchi Plowr. Ured. p. 250 p.p. 



Peridermium Magnusianum Fisch. Contrib. etude du genre Coleo- 

 sporium, in Bull. Soc. Bot. Fr. xli. 171. 



P. Magnusii Wagner, Zeitschr. f. Pflanzenkr. vi. 9 and viii. 257. 



L J . . ** [ Resembling those of other Coleosporia.] 



AjCidwspores ) 



Uredospores. Sori numerous, roundish, at first covered by 

 the epidermis, at length pulverulent, orange ; spores ellipsoid ; 

 verruculose, deep-yellow, 24 — 35 x 21 — 24 /jl. 



Teleidospores. Sori hypophyllous, forming flat, red, waxy 

 crusts; spores prismatic, up to 140 jx long, 18 — 25 /x broad, 

 thickened (up to 28 //,) at the summit. 



[iEcidia on leaves of Pinus montana, perhaps also of P. 

 silvestris;] uredo- and teleutospores on Cacalia hastata, G. 

 suaveolens. The spermogones and gecidia have not been observed 

 in Britain ; the other spore-forms at Bath (Rev. J. E. Vize), 



