no Bi'itisJi Fiuin. 



<^ 



zoogouidia on germination, globose or globoso-cylia- 

 drical, wall tliin, colourless, 18-21 /jl ; oospore 

 globose, epispore brown, with numerous minute warts 

 whicb sometimes become spinulose, 45-55 fx dia- 

 meter. 



Gystopus lepigoni, De Bary, Ann. Sci. Nat. ser. 

 iv. vol. XX. p. 132; Cke. Hdbk. n. 1565; Cke. Micr. 

 Fung. p. 214; Sacc. Syll. vii. n. 796. 



On leaves of various caryophyllaceous plants, as 

 Spergularia rubra, Arenaricv meclia, &c. Local. Dis- 

 tinguished from other species having a large apical 

 gonidium by the very small, numerous warts on the 

 epispore of the oospore. 



Phytophtliora, De Bary. 



Mycelium ramifying in the tissues of the host, 

 haustoria scattered or absent; gonidiophores 

 generally sparingly branched, gonidia at first terminal 

 on the branchlets, then apparently lateral also, ellip- 

 tical, apex papillate, producing zoogonidia on germina- 

 tion. Oospore globose, epispore smooth, rather thin, 

 brown. 



PhytopJithora, De Bary, Journ. Bot. 1876, pp. 105 

 —126, 149—154; Sacc. Syll. vii. p. 237. 



Peronospora of various authors. The gonidia at 

 first appear on the tips of the branches, but after the 

 formation of a gonidium, the branch producing it 

 continues to elougate in the direction of the original 

 branch, and the first gonidium, that was a terminal 

 product, is pushed on one side, and appears as a lateral 

 development; this process is repeated two or three 

 times by each branch. 



