220 MICEOSCOPIC FUNGI. 



and laterally compressed. — On Salix viminalis and S. caprcp.a. 

 C"mmon. Spores perfected in February. (Plate IX. figs. 191, 

 192.) 



Cyst OPUS, Be Bary, 



Keceptscle consisting of thick branched threads ; conidia con- 

 catenate, at length separating ; oospores deeply seated on 

 the mycelium. 



Cystopus candidus, Lev. Crucifer White Rust ; 

 coniaia equal, globose; membrane equal, ochrapeous ; oospores 

 subglobose ; epispore yellowibh-bro':vn, with irregular obtuse 

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

 Cruciferse. Summer. Very common. (Plate X. figs. 19S-20O, 

 205-207.) 



Cystopus cnbious, Str. Goatsbeahd "White Rust ;■ 

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

 membrane thickened, ochraceous, rarely yellowish ; fertile cells 

 sDortly cylindrical ; membrane hyaline; oospores _ globose ; epi- 

 spore brown, verrucose ; warts hollow, round, or irregular. — On 

 Goatsbeard, Salsifv, and Scorzonera. Summer and autumn. 

 Common. (Pla^e X. figs. 201, 202, 210.) 



Cystopus Lepigoni, De By. Saxdwoet "White Rust ; 

 conidia unequal; terminal cell sterile, globose; membrane 

 thickened; fertile cells subglobose or cylindrical; membrane 

 hya'me; oospores globose; epispore brown; tubercles minute, 

 irregular, very convex, often resembling spines. — On Spergv.taria 

 rubra. Swanscombe Marshes. September. 



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

 coniaia in time much elongated ; sori erumpeut on both 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. 



Lecythea, Led. 



Stroma surrounded or sprinkled with elongated abortive spores. 

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

 — Berk. Outl., p. 334;. 



* Spores free. 



