136 British Fmigi. 



presenting a reticulated appearance ; oogonia one or 

 many spored, not perforated. 



Bidyuclnis, Liete. in Pringsh. Jalirb. vii. p. 357; 

 Sacc. Syll. vii. p. 273. 



Closely resembling Pythium, the generic difference 

 depending almost entirely on the thin membranes 

 originally clothing the zoogonidia remaining in an 

 empty condition in the zoosporangia, and giving to 

 the latter a cellular appearance. 



Bidyuclnis monosporus, Lietg. (figs. 102 — 104). 



Dioecious ; hyph^ aseptate, branched ; oogonia 

 terminal on tbe branchlets, spherical, not perforated, 

 25-30 fi diameter, containing one globose, hyaline 

 oospore; antheridia vermiform, branched, clasping, 

 but not perforating, the oogonia; zoosporangia 

 elongato-clavate, containing numerous spherical, bi- 

 ciliate zoosfonidia, which emerg-e in the active condition, 

 leaving their exceedingly delicate membranes in the 

 form of a tissue or netvrork in the zoosporangia. 



Bictyuchus monosporus, Lietg. in Pringsh. Jahrb. 

 vii. p. 371, pi. xxii., xxiii.; Sacc. Syll. vii. n. 936. 



In rotting bulbs of tulips and hyacinths in water. 

 Rare. 



Biplanes, Lietg. 



Zoosporangia delicate, perforated, zoogonidia bi- 

 ciliate, at first enclosed in a delicate membrane, from 

 which they escape before leaving the zoosporangium ; 

 oogonia perforated, polysporous. 



Biplanes, Lietg. in Pringsh. Jahrb. vii. p. 374 ; 

 Sacc. Syll. vii. p. 274. 



Yeiy near to the genus Saprolcgnia, differing in the 



