154 British Fungi. 



flattened, scarcely projecting above the surface of tbe 

 leaf; resting-spores globose^ brown, smooth, 50-80 i^ 

 diameter ; sori globose or elliptical. 



Synchytrium taraxaci, De Bary et Wor. ; Beitr. 

 Kennt. Chytrid. 1863 ; Sacc. Syll. vii. n. 999. 



Forming orange-red or blood-red crust-like expan- 

 sions on the leaves and involncral bracts of various 

 composite plants. The galls are flattened and pro- 

 ject very slightly above the surface of the leaf. Not 

 uncommon. 



Synchytrium steUaria, Fckl. 



Galls hemispherical, scattered or aggregated in 

 broad crust-like patches ; resting-spores solitary or 

 in pairs in cells of the matrix, globose, protoplasm 

 reddish, epispore chestnut colour, thick, smooth, 

 50-150 /jl diameter, generally about 75 /jl. 



Synchytrium stellariae, Fuckel, Symb. Myc. p. 189 ; 

 Sacc. Syll. vii. n. 1001. 



On stems, leaves, and sepals of SteUaria media. 

 The warts are usually confluent, forming broadly 

 expanded crust-like patches devoid of any special 

 colour. Bare. 



Rhizidium, A. Braun. 



Sporangia sessile on the host, composed of two 

 superposed cells, the inferior cell sterile, giving origin 

 to rhizoids that penetrate the host ; upper cell fertile, 

 becoming transformed into a zoosporangium or a thick- 

 walled resting-spore, which after a lengthened period 

 of rest germinates and produces a thin-walled cell 

 containing zoogonidia. 



lihiziditun, A. Braun, Ueber Chytrid. 1856; Sacc- 

 Syll. vii. 1, p. 296. 



