1 82 British Fungi. 



globose, or variously elongated, violet - brown, 

 minutely verruculose, sometimes almost smooth, 7- 

 12 or 10-20 X 8-11 /z; promycelium cylindrical, 3- 

 septate, sporidia elliptic, produced laterally in con- 

 siderable quantities, conjugating in pairs. 



Sphacelotheca hydroj^iiperis, De Bary, Morpb. Pilze, 

 p. 187; Sacc. Syll. vii. ii. no. 1834; Plow. Brit. 

 Ured. and Ustilag. p. 499. 



Ustilago Candollei, Tub Mem. sur les Ustilag. p. 

 93 ; Cke. Micr. Fung. ed. 4, p. 299. 



In tbe ovaries of Polygonum historta, P. hydroiJijwr, 

 P.^ersicaria, P. vivijjara. Not common. 



Tilletia, Tulasne. 



Resting- spores simple on branches of the mycelium 

 which becomes gelatinized, produced in sori or 

 clusters -that become pulverulent when mature; 

 epispore thick, generally ornamented with raised 

 bands combined to form a network, or warted ; pro- 

 mycelium producing sporidia at the apex only ; gonidia 

 are formed by the mycelium in a nutritive solution. 



Tilletia, Tub Ann. Sci. Nat. 1874, p. 112; Plow. 

 Brit. Ured. and Ustilag. p. 283 ; Sacc. Syll. vii. pt. 

 i. p. 81. 



The resting-spores on germination give origin to a 

 septate promycelium which in turn produces at the 

 apex a variable number of slender, elongated primary 

 sporidia which usually conjugate or become connected 

 in pairs by the formation of a transverse branch, thus 

 forming H-like bodies ; after conjugation small 

 secondary gonidia are produced by the primary 

 gonidia. The so-called conjugation is not a sexual 



