Classification. 121 



Peronospora affinisy Rossm. 



Gonidiopliores stout, regularly 5 — 7 times dichoto- 

 mously divided, brandies spreading, ultimate branch- 

 lets short, subulate, straight or curved towards the 

 base; gonidia elliptical, 22-26x15-18, obtuse, pale 

 dingy-lilac ; oospores globose, epispore smooth, brown. 



Peronospora affinis, Rossm. in Rab. Herb. Myc. ed. 

 ii. n. 189; De Bary, Ann. Sci. Nat. ser. iv. vol. xx. 

 p. 118; Sacc. Syll. vii. n. 837. 



On leaves of Fumaria officinalis. Rare. 



Peronospora violae, De Bary. 



Forming felt-like, effused, pale greyish-lilac 

 patches; gonidiophores fasciculate, short, 2 — 7 times 

 dichotomously divided, ultimate branchlets short, 

 subulate, deflexed ; gonidia elliptical, shortly apicu- 

 late, pale lilac, 20-24 x 14-18 /a. 



Peronospora violw, De Bary, Ann. Sci. Nat. ser. 

 iv. vol. XX. p. 125 ; Sacc. Syll. vii. n. 838. 



On living leaves of Viola tricolor and V. Riviana. 

 Rare. 



Recedes from the genus Peronospora in having th.e 

 gonidia apiculate, but typical in other respects. 



Peronospora tr if olio rum, De Bary. 



Forming effused greyish patches ; gonidiopliores 

 equally or unequally 6 — 7 times dichotomously or 

 rarely trichotomously divided, ultimate branchlets 

 subulate, acute, slightly curved; gonidia ellipsoid, 

 very obtuse, pale dirty lilac, 18-27x15-20 fi ■ 

 oospores globose, brown, smooth, 25-38 fju diameter. 



Peronospora trifoliorumf De Bary, Ann. Sci. Nat. 

 ser. iv. vol. xx. p. 117, 1863; Sacc. Syll. vii. no. 



