Classification, 1 2 5 



mously divided, branclies flexuous, ultimate branclilets- 

 subulate, curved and often deflexed ; goaidia broadly 

 elliptical or subglobose, distinctly pedicellate, apex 

 very obtuse, 20-28 x 17-21 yj, pale dingy lilac; 

 oospores globose, brown, smooth, 21-25 /a dia- 

 meter. 



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

 iv. vol. XX. p. 116; Sacc. Syll. vii. n. 856; Cke. 

 Hdbk. n. 1782 ; Oke. Micr. Fung. p. 216. 



On the under surface of leaves of common nettle, 

 TJrtica dioica and U. urens. Not uncommon. 



Forming small lilac-grey patches. Cooke says that 

 the gonidia have the apex papillseform, but very obtuse 



Peronospora Schleideni, Unger. 



Forming greyish-lilac tufts ; gonidiophores large, 

 erect, aseptate, 250-400 //. high, branched alternately 

 or in a dichotomous manner, ultimate and penulti- 

 mate branches strongly arched; gonidia obovate, apex 

 obtuse or subacute, pale dingy violet, 45-55 x 22-25 

 /ju; oospores broadly elliptical or globose, epispore 

 thin, smooth. 



Peronospora Schleideni, Unger, Bot. Ztg. 1847, p. 

 315; Sacc. Syll. vii. n. 857. 



Peronospora Schleideniana, Cke. Hdbk. n. 1787; 

 Cke. Micr. Fung. t. 13, f. 263. 



Botrytis destructor, Berk. Ann. Nat. Hist. vol. vi. p. 

 436, t.'l3, f. 23. 



On leaves of various species of Allium. Not un- 

 common. 



Forming broadly effused patches which sometimes 

 entirely cover the leaves ; very destructive during 

 some seasons to the cultivated onion. 



