200 British Fuiwi. 



3 



ForQiiug crust-like expansions on tlie stem and 

 irregularly rounded spots on tlie leaves ; gonidial 

 condition forming \Yliite, effused patches on the under 

 surface of the leaves^ gonidiopliores slender, erect, 

 originating from mycelium in the tissues of the leaf, 

 and passing into the air either through the stomata or 

 between the epidermal cells. The life history of the 

 present species is worked out and beautifully illustrated 

 by A\"oronin, Beitrag. zur Kenntniss der Ustilagineen. 



Thecaphora, Fiugerh. 



Spore-clusters composed of resting-spores of equal 

 size and firmly adherent, difficult to separate without 

 rupturing, free portion of surface convex, lateral 

 contiguous portions flattened; promycelium filiform, 

 sometimes with short lateral branches, primary 

 sporidia fusoid, solitary at apex of promycelium. 



Tlieccqiliora, Fingerhuth, in Linneea, x. (1835), p. 

 230 ; Sacc. Syll. vii. pt. ii. p, 507 ; Plow. Brit. Ured. 

 and Ustilag. p. 295. 



Agreeing with Sorosporium in having all the 

 resting-spores of the spore-cluster fertile and of equal 

 size, but in Sorosporium the resting-spores are very 

 numerous, small, and spherical, and easily fall apart, 

 in the present genus the resting-spores are firmly 

 adherent to each other, the surfaces in contact 

 flattened, the free portion convex. 



Thecaphora hi/alina, Fingerli. (figs. 88, 89, 111). 



Produced within the seeds of the host, sori pale 

 reddish-brown, coarsely pulverulent ; spore-masses 

 irreo-ularly globose, very variable in size, 25-50 /x 



