220 MICEOSCOPIC FUNGI. 



and laterally compressed. — On Salix vmiaalis and S. caprtea. 

 Common. Spores perfected in February. (Plate IX. figs. 191, 

 193.) 



Ctstopus, Be Bary. 



Receptacle consisting of thick branched threads ; conidia con- 

 catenate, at length separating ; oospores deeply seated on 

 the mycelium. 



Cystopus candidus, L6v. Cstjciper White Eust; 

 conidia equal, globose ; membrane equal, ochraeeous ; oospores 

 subglobose ; epispore yellowish-brown, with irregular obtuse 

 warts ; warts solid. — On Shepherd's-purse, Cabbages, and other 

 Crnciferse. Summer. Very common. (Plate X. figs. 198-200, 

 205-207.) 



Cystopus eubicus, Str. Goatsbeabd White Rust; 

 conidia unequal; terminal cell sterile, larger than the rest; 

 membrane thickened, ochraeeous, rarely yellowish ; fertile cells 

 shortly cylindrical ; membrane hyaline ; oospores globose ; epi- 

 spore brown, verrucoses warts hollow, round, or irregular. — On 

 Goatsbeard, Salsify, and Scorzonera. Summer and autumn. 

 Common. (Plate X. figs. 201, 203, 210.) 



Cystopus Lepigoni, De By. Sandwort White Rust ; 

 conidia unequal: terminal cell sterile, globose ; membrane 

 thickened; fertile cells subglobose or cylindrical; membrane 

 hyaline ; oospores globose ; epispore brown ; tubercles minute, 

 irregular, very convex, often resembling spines. — On Spergutaria 

 rubra. Swanscombe Marshes. September. 



Cystopus spinulosus, De Bary. Thistle (White) Rust ; 

 conidia in time much elongated ; sori erumpent on bolh surfaces 

 of the leaves, white ; oospores globose ; epispore brown ; tubercles 

 minute, solid, very prominent, often acute and spinulose.— On 

 Thistles. Not uncommon. September. 



The residue of genera in this group contain in the majority of 

 instances imperfect forms. 



Lectthea, lev. 



Stroma surrounded or sprinkled with elongated abortive spores. 

 Spores free, invested with their mother cell, or concatenate. 

 —Berk. Outl., p. 334. 



* Spores free. 



