C^OMACEI. 



525 



hyaline; oospores globose, epispore brown, tubercles minute, 

 irregular, very convex, often resembling spines. — Cooke M. F. p. 

 214. Cooke exs.jio. 88. 



On Spergularia rubra. June. — Sept. 



1566. 



Cystopus spinulosus. Be Bar y. "Thistle White Rust." 



Conidia in time much elongated ; sori erumpent, on both sur- 

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

 tubercles minute, solid, very prominent, often acute and spinu- 

 lose, — De Bary,Ann. des Sc. Nat. 1864, xx. ^. 133. Cooke exs. 

 no. 89. 



On Cirsiumarvense. Sept, 



Gen, 179. 



UREDO, Lev. 



Fig. 216, 



Stroma composed of little irregu- 

 lar cells, forming a lentiform disk, 

 ■whose surface is covered with many 

 layers of cells, each of which en- 

 closes a spore ; spores simple, 

 always without any appendage. — 

 Berk, Outl p. 331. {_Fig. 216.) 



1567. 



* Spores more or less yellow. 

 ITredo potentillazuxn. B.C. " Potentilla Uredo." 



Spots yellowish; sori subrotund and oval, bullate, aggregate, 

 open, confluent; spores subglobose, subcoherent, orange. — D.C. 

 Fl. Fr. Yi. p. 81. Eng.Fl.Y.p.m2,p)artly. Cooke M.F. p. 204. 

 Cooke exs. no. 120. Moug. exs.no. '^1. 



On various Eosaceoe. Common. 



1568. 



Vredo saxifxagaarum. B.C. " Saxifrage Uredo." 



Spots palhd ; sori subrotund and oval, raised, scattered and 

 aggregate on the under surface ; epidermis ruptured, persistent ; 

 spores subglobose, yellow. — D.C. Fl. Fr. vi. p. 87. Eng. Fl.Y.p. 

 381, Cooke,3I.F.p.204:. 



On various Saxifrages. 



