Classificatio n, 109 



verse, ttickened, 1*111^* 19-23 jm diameter, procluciDg 

 zoogonidia on germination ; oospore spherical, epi- 

 spore brown, with, large, hollow, irregular warts, which 

 are themselves minutely warted, 45-60 iju. 



Cystopus tragopogonis, Schroet. Kr. Fl. Schles. 

 Pilze, p. 234 ; Sacc. SylL vii. n. 793. 



Cystopus cuhicus, De Bary, Ann. Sci. Nat. ser. iv. 

 vol. XX. p. 132, tab. 2; Cke. Hdbk. n. 1563; Cke. 

 Micr. Fung. pi. x. ff. 201, 202, and 210. 



Uredo Candida, yS tragopogi, Pers. Syn. Fung. p. 

 223. 



On both surfaces of leaves of various composite 

 plants, especially goat's-beard, Tragopogon pratensis ; 

 also on some plants belonging to the order Convol- 

 vulacece, as Convolvulus and Ipomcea. Not un- 

 common. 



Bearing a superficial resemblance to Cystopus 

 candiduSy but readily distinguished by the cuboid 

 gonidia. 



Var. spinulosus. 



With the general characters of C tragopogonis, but 

 eventually the gonidia become elongated, warts of 

 oospore very prominent, often becoming spinulose. 



Cystopus spinulosus, De Bary, Ann. Sci. Nat. ser. 

 iv. vol. 20, p. 133; Cke. Hdbk. n. 1566; Sacc. 

 Syll. vii. n. 794. 



On leaves of various thistles. Local. 



Cystopus lepigoni, De Bary. 



Sori yellowish, usually in minute, scattered pustules ; 

 terminal gonidium of chain longer than the rest, 

 thick- walled, globose, sterile, the remainder producing 



