Classification . 



1^1 



pletely evolved iu the zoosporangium and escaping in 

 the swarming state ; oogonia containing many, rarely 

 only one oospore ; antheridia small, clavate or ovate, 

 produced at the tips of special, slender branchlets. 



Saj/rolegnia, 'Nees, Nov. Act. Leop. xi. 2, p. 513; 

 Sacc. Syll. vii. p. 268. 



Remarkable for the manner in which the zoospo- 

 raDgia appear within each other, the walls of the older 

 ones being persistent and remaining as a sheath 

 round the younger ones. 



A. Species monoecious. 



* Oogonia i^olysporous, 



Saprolegnia androgynia, Archer. 



Monoecious ; oogonia barrel-shaped or elliptical, 

 generally in an uninterrupted terminal series, rarely 

 interstitial; antheridial branches springing from the 

 walls of the oogonia and fertilizing the oospheres of 

 the oogonium immediately above the oogonium from 

 which they originate, oospheres of lowest oogonium 

 of the series fertilized by antheridia springing from 

 the stem ; oospores numerous in each oogonium, 

 globose, 30-35 fjb diameter. 



Saprolegnia androgynia, Archer, Quart. Journ. Micr. 

 Sci. vol. vii. new ser. p. 123, pi. vi. f. 1 ; Sacc. Syll. 

 vii. n. 912. 



" In 'one instance, in the mass made by the plant, 

 three seeming sporangia (zoosporangia), evacuated by 

 zoospores, one ivithin the other, each showing a ter- 

 minal opening, were observed .... the whole plant 

 large and coarse as compared with other described 

 forms in this family '' (Archer). 



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