356 PLANT DISEASES 



Epispore of oospore smooth. 



Peronospora schleideni, Unger., Bot. Ztg.^ 1847, p. 315. 

 — Forming greyish-lilac tufts ; conidiophores erect, 250- 

 400 \i high, branched alternately, or in a dichotomous 

 manner, ultimate and penultimate branches strongly 

 curved ; conidia obovate, apex obtuse or subacute, pale 

 dingy violet, 44-52X22-25 /x ; oospores broadly elliptical 

 or globose, epispore thin, smooth. 



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

 vol. XX. p. 117 (1863). — Conidiophores 350-450 /x high, 

 forming broadly effused tufts, equally or irregularly 6-7 

 times dichotomous, rarely trichotomous, primary branches 

 4-5 times dichotomous ; ultimate branchlets pointed, 

 slightly curved ; conidia ellipsoid, about 21 /x diam., wall, 

 pale violet ; oospores globose, epispore thick, smooth, 

 brown, 25-34 /x diam. 



Peronospora schachtii, Fuckel, Synib. Myc, p. 71 

 (1869-70). — Forming dense grey tufts; conidiophores 

 erect, 6-8 times dichotomous, primary branches 2-5, short, 

 ultimate branchlets generally unequal, short, straight, 

 wide - spreading, obtuse ; conidia ovate, pale umber, 

 20-24X15-18 /x ; oospores globose, wall thick, smooth. 

 Very closely allied to F. effusa. 



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

 vol. XX. p. 125. — Forming somewhat dense, clear, pale 

 violet tufts; hyphae rather short, about 300 /x, 4-7 times 

 dichotomously branched, ultimate branchlets short, acute, 

 deflexed ; conidia elliptical, blunt, shortly apiculate, aver- 

 aging 25X 18 /x, pale violet; oospore with a golden-brown 

 epispore. 



Peronospora cubensis. Berk, and Curt., Poiirn. Linn. Soc 



