Phylum：Oomycota　>>　Class： Oomycetes　>>　 Order： Saprolegniales 
   
 
　BCRC Number： NO BCRC Number!  
   
　Scientific Name： Saprolegnia ferax
 
   
   
　Author：

Saprolegnia ferax (Gruith) Thuret. Ann. Sci. Nat. Bot. Ser, Ⅲ, 14: 214, pl. 22. 1850.
   
 
 
 
 
　Description： Hyphae stout, 20-50 μ in diameter, sparingly branched. Gemmae abundant, variable in shape, filiform pyriform, often irregular; terminal or intercalary; single or catenulate; functioning as zoosporangia. Zoosporangia filiform; renewed by internal proliferation. Zoospore discharge saprolegnoid. Oogonia generally abundant, rarely forming only after prolonged period of time; terminal or lateral; sometimes intercalary or catenulate; spherical or pyriform, sometimes clavate; (40)-60-70(140) μ in diameter. Oogonial wall pitted; often with basal in growth. Oogonial stalk short in general, sometimes branched. Oosphere maturing. Oospores centric, or subcentric ; spherical, (1)-7-12-(35) in number; (20)-22-25-(30) μin diameter, sometimes lacking; monoclinous or androgynous. Antheridial cells tubular or clavate, sometimes branched laterally or rarely apically appressed usually persistent.
 
 
 
 
 
　Specimens：

Collected in cooler river water; wide-spread in Taipei. (April 4, 1974.Shih-Lin, river).
 
 
 
　Habitat： Soil and water
 
 
 
　Distribution：

German ; Austria; Italia ; Swiss; Netherland
 
 
 
　References：

Coker WC. 1923; Seymour RL. 1970.
   
   
   
　Provided：

T. S. Chiou and H. S. Chang
 
 
　Note： One of our isolates has antheridia on less than 10 percent of the oogonia, the others have antheridia on all the oogonia, but Seymour (1970) and others show them to be unrecognizable as distinct entities. Additionally, we find the cylindrical oogonium grows in the sporangia in some of our isolates. In Taiwan this species isolated and recorded by Chung without describing it in detail, but two simple figures.