USTILAGINACEAE 405 



glomerules of spores globose or elliptical, iy-24X 15-20 /A, 

 fertile central spores 18-20 /z diam., dark brown ; peripheral, 

 pale, sterile spores forming an interrupted zone; spores 

 soon germinating ; sporidiola rarely conjugating, producing 

 a germ-tube from the base. 



Sorosporium, Rudolphi. Resting-spores of uniform size, 

 small, all fertile, at first in dense clusters, soon breaking 

 up, produced by tufts of intertwined hyphae which become 

 gelatinised, the entire spore-mass at first involved in 

 a gelatinous integument ; promycelium filiform ; sporidia 

 unknown. 



Sorosporium scabies, Fischer de Waldh., Aper$u, p. 33. 

 = Tuberdnia scabies, Berk. Sori forming large, olive, scab- 

 like expansions ; spore-clusters globose or elliptic-oblong, 

 forming a hollow sphere, perforated, here and there, 20-50 p. 

 diam. ; resting-spores subangular from mutual pressure, 

 smooth, pale olive-brown, about 5 /* diam. 



Described from Berkeley's specimens in Herb. Kew. 



Oedomyces, Sacc. Mycelium very delicate, intercellular, 

 sporiferous branches bearing a terminal spore, immediately 

 below which is a large vesicular swelling ; spores rarely 

 solitary, most frequently occurring in great numbers; 

 epispore thin, brown, smooth. 



Oedomyces leproides, Trabut, Rev. generate Bot., 1894, 

 No. 70, i pi. ; Sacc., *$>//., xi. p. 234. Forming large, 

 nodulose, fleshy tumours on the upper part of the root of 

 Beta vulgaris, var. rapacea \ spores globoso-depressed, 

 umber, 40-50 X 30 ft, acrogenous ; mycelium inflated into 

 a vesicle below the spore \ spores produced in masses 

 within spherical cysts in the substance of the tumours. 



