Classification. 1 99 



at the apex ; gonidial condition originating from 

 mycelium in the living host-plant^ white, forming 

 expanded tufts ; gonidia elliptical. 



Tuhurcinia, Fries, Syst. Myc. iii. p. 430 ; Sacc. 

 Syll. vii. pt. ii. p. 507. 



T^ihurcinia, Plow. Brit. Ured. and Ustilag. p. 293. 



Resembling Sorosporium in having* the resting- 

 spores of uniform size and structure aggregated in 

 clustei's, but differs in the absence of a gelatinous 

 integument sarrounding the spore- clusters. 



Tuhurcinia trientalis, B. and Br. (figs. 112 — 115). 



Sori 3 — 4 mm. broad^ black, bullate, for some time 

 covered by the epidermis ; spore-clusters globose, 

 elliptical, or irregular, composed of from 50 — 100 

 resting-sporcs, 40-120 /x diameter ; resting-spores 

 globose, elliptical, often irregularly compressed by 

 mutual pressure, 15-32x10-17 /jl, epispore smooth, 

 obscure brown, semipeUucid; primary sporidia 

 numerous, produced at the apex of the promycelium, 

 cylindrical-fusoid, conjugating in pairs towards the 

 base and bearing fusiform, secondary sporidia ; gonidia 

 colourless, elliptical or obpyriform. 



Tuhurcmia trientnlis, B. and Br. Ann. Nat. Hist. 

 (1S50) n. 488 ; Sacc. Syll. vii. pt. ii. n. 1853. 



Tuhercinia trientalisj Plow. Brit. Ured. and 

 Ustilag. p. 293. 



AscomycGs trientaUs^ Berk. Outl. p. 376; Cke. 

 Hdbk. p. 516 (gonidial condition). 



Sorosporium trientcdis, Woronin, Cke. Micr. 

 Fnug. ed. 4, p. 231. 



On the stem and leaves of Trientalis eiiropsea. Rare. 



