128 



PHYCOMYCETES. 



arise in tufts from the stomata; they are branched in various 

 ways, and from each branchlet a single conidium is abjointed. 

 The contents of the conidia emerge as swarming cells with two 

 lateral cilia, or as vesicles which emit a germ-tube. The egg-cells 

 occur singly in each oogonium, and are fertilized by an antheridium. 

 The oospores remain long enclosed in the thick-walled oogonium. 



Fig. S9.~Plojsmopara viticola. Vine leaf with white spots on the under surface, 

 from which tufts of conidiophores emerge, (v. Tubeuf deL) 



Flasmopara nivea (Unger). (Britain and U. S. America). 

 Inflicts great injury on various wild and cultivated Umbelliferae, 

 e.g. carrot (Daucus Carota), parsley {Petroselinum sativum), chervil 

 (Anthriscus Gerefolium). 



Flasmopara viticola, Berk.^ The Downy or False Mildew of 



' Bibliography. De Bary, Annal. d. sci. not. , 1863. Viala, Die Pihe d. 

 Weinstockes ; with good bibliography. Prillieux, Annal. de. Vinstit. nat. 

 agr<momigue, 1881. Cornu, Le Pironospora des Vignes, Paris, 1882. Sajo, 



