Classijicatio n, 135 



witliin tlie cells of the host^ spherical or oblong, BO- 

 SS fi ; zoogoiiidia subreniform, witb a cilium at each 

 end ; oogonia globose, terminal or intercalary, oospore 

 globose, epispore thick, with ridges forming a vague 

 reticulation, 40-45 fj, diameter ; antheridia termiDai 

 on branches developed near the oogonia, which are 

 perforated by a short beak. 



Pythium cystosiphon, Lindstedt, Syn. Saproleg. 

 p. 50; Sacc. Syll. vii. n. 927. 



Cystosiplion pythioides, E,oze et Corun, Ann. Sci. 

 Nat. ser. v. vol. xi. p. 72, t. iii. figs. 1 — 22. 



In living fronds of WolffiaMiclielii{ —Lemna arrldza, 

 L.) Rare. 



PytJiium megalacanthum, De Bary. 



Mycelium branched, aseptate, branches tapering ; 

 zoosporangia spherical, elliptical, obovate, or irregular 

 in outline, usually with several elongated beaks: 

 zoogonidia subglobose, biciliate, 18-20 /jl diameter; 

 oogonia terminal or intercalary, 38-45 /ul diameter, 

 wall thick, with numerous stout, conical spines, 8- 

 10 JUL long; oospores globose, 25-30 /j. diameter, 

 smooth. 



PytJiium megalacantlium, De Bary, in Schroet. Kr. 

 Fl. Schles. Pilze, p. 232. 



In semiputrid vegetable remains in water. Rare. 



Distinguished by the many beaked zoosporargia 

 and the coarsely spinulose oogonia. 



Dictyuchus, Lietgeb. 

 Zoospores of two forms, escaping from their proper 

 membranes before leaving the zoosporangia, the 

 empty membranes remaining in the zoosporangia and 



