Classification, 117 



On leaves of several rubiaceous plants, as Galium 

 verum, G. aparinej G. fcdustris; Asperula dor at a ; 

 Sherardia arvensis, &c. Not common. 



Peronospora myosotidis, De Bary. 



Gonidiopliores slender, elongated, generally emerg- 

 ing through the stomata of the leaf in pairs_, uni- 

 formly 6 — 9 times dichotomously divided, all the 

 branches spreading, terminal branchlets very slender ; 

 gonidia elliptical, very obtuse at both ends, 20-23 

 X 13-18 iJbj wall thin, with a faint tinge of lilac; 

 oospores globose, 25-30 ^l, epispore stout, clear 

 yellow -brown, with thick ridges combined to form a 

 regular, large-meshed reticulation. 



Peronospora myosotidis, De Bary, Ann. Sci. Nat. 

 ser. iv. vol. xx. p. 112 ; Sacc. Syll. vii. 818. 



On various boraginaceous plants, as Myosotis arven- 

 sis, M. hispida ; Symphytum officinalis, S. tuherostim ; 

 Lithosperumum arvense, &c. Not common. 



Peronospora vicise, De Bary. 



Gonidiophores forming dense, effused, whitish, then 

 pale pinkish-grey tufts, equally, rarely irregularly 

 6 — 8 times dichotomously branched, branches 

 squarrose, the ultimate branchlets subulate, short ; 

 gonidia elliptical, apex rounded, base blunt or rather 

 acute, membrane thin, pale dingy violet, 25-28 x 

 15-18 /a; oospores globose, pale yellow-brown, with 

 ridges united to form a regular, wide-meshed reticu- 

 lation. 



Peronospora vicise, De Bary, Ann. Sci. Nat. ser. iv. 

 vol. XX. p. 112; Sacc. Syll. vii. 819; Cke. Hdbk. 

 n. 1779 ; Cke. Micr. Fung. t. 15, f. 266 ; t. 10, f. 212. 



