1 1 6 British Ftifto-i, 



culate, emerging througli the stomata, cylindrical, 

 generally many times dichotomously divided above, 

 terminal branchlets often acuto-incurved and bearing 

 tlie elliptical gonidia, which are not furnished with an 

 apical papilla, and germinate by the protrusion of a 

 lateral germ-tube. 



Peronosjwra, Corda, Icon. i. p. 20 ; Sacc. Syll. vii. 

 p. 244. 



Peronospora, Cke. Hdbk p. 592 (in part). 



Forming thin " mildew ^' on the living leaves of 

 plants ; known amongst its allies by the filiform 

 branched haustoria, and absence of a papilla at the 

 apex of the gonidium. 



A. Calotliecse, De Bary. Oospore globose, epispore 

 warted, or with ridges that often anastomose and form 

 a reticulation. Mycelium generally bearing filiform 

 branched haustoria. 



Peronospora calotlieca, De Bary. 



Gonidiophores slender, 7 — 9 times dichotomously 

 divided above, primary branches suberect, remainder 

 spreading on every side, ultimate branchlets very 

 slender, short, straight or slightly curved ; gonidia 

 elliptical, 25-30x14-17 fi, rounded and obtuse at 

 both ends, very pale lilac ; oospores globose, epispore 

 stout, bay, with thin ridges united to form a minute 

 reticulation. 



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

 ser. iv. vol. xx. p. Ill (1863) ; Sacc. Syll. vii. 

 817. 



Peronospora galii, Fuckel, F. Rhen. n. 28. 



Peronospora slier ardix, Fuckel. 



