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 u. 
Teleutospores. Sori forming small, flat, roundish, waxy-red 
crusts; spores prismatic, length reaching 100 p, breadth 18— 
30 4; epispore at summit reaching 18 « thick. 
AKcidia on leaves of Pinus silvestris; uredo- and teleuto- 
spores on Sonchus arvensis, S. asper, S. oleraceus, August— 
November, not uncommon. (Fig. 244.) 
Klebahn, Fischer, and Wagner have demonstrated the life-cycle of this 
parasite; the two former have also proved that it cannot be transferred to 
Cacalia, Campanuta, Senecio, or Tussilago. Fischer records this species 
on Sonchus palustris as well as on the hosts given above. 
DISTRIBUTION : Europe. 
5. Coleosporium Cacalie Fckl. 
Oredo Cacaliae DC. Flor. fr. vi. 65. 
Coleosporium Cacaliae Fckl. Symb. Myc. p. 43. Cooke, Micr. Fung. 
p. 218. Fischer, Ured. Schweiz, p. 446. 
C. Soncht Plowr. Ured. p. 250 p.p. 
Peridermium Magnusianum Fisch. Contrib. étude du genre Coleo- 
sporium, in Bull. Soc. Bot. Fr, xl, 171. 
P. Magnusti Wagner, Zeitschr. f. Pflanzenkr. vi. 9 and viii. 257. 
[Spermogones 
Aeidiospores 
Uredospores. Sori numerous, roundish, at first covered by 
the epidermis, at length pulverulent, orange; spores ellipsoid, 
verruculose, deep-yellow, 24—35 x 21—24 p. 
Teleutospores. Sori hypophyllous, forming flat, red, waxy 
crusts; spores prismatic, up to 140 long, 18—25 4 broad, 
thickened (up to 28 ) at the summit. 
} Resembling those of other Coleosporva.] 
[Mcidia on leaves of Pinus montana, perhaps also of P. 
silvestris ;] uredo- and teleutospores on Cacalia hastata, C. 
suaveolens. The spermogones and ecidia have not been observed 
in Britain; the other spore-forms at Bath (Rev. J. E. Vize), 
