LAGENIDIALES 1011 



pic, without a specialized vegetative system, forming the rudiment of a 

 single male or female gametangium, cyst and infection tube of zoospore 

 persistent; zoosporangia and zoospores not observed; plants dioecious 

 (?), the female gametangium swollen locally and, after fertilization, 

 bearing in it the thick-walled resting spore, germination not observed; 

 male gametangium smaller than the female, broadly expanded distally 

 where it is applied to the female gametangium, separated from the 

 concomitant thallus by a cross wall, forming a fertilization tube. 



In oogonia of Characeae. 



Until the zoospores can be described, the systematic position of this 

 genus must remain uncertain. The persistence of the cyst and infection 

 tube does lend weight to its being correctly placed in the Lagenidiaceae. 

 De Wildeman was not certain whether the organism is always dioecious. 

 In some specimens the male gametangium appeared to form by sep- 

 tation of the thallus into two gametangia. 



The genus has been merged with Lagenidium by Karling (1942e). 



? Lagenidiopsis reducta de Wildeman 

 Ann. Soc. Beige Micro. (Mem.), 20: 115, pis. 6-7. 1896 



Lagenidium reduction (de Wild.) Karling, Simple Holocarpic Biflagellate 

 Phycomycetes, p. 80. 1942. 



Characters of the genus; resting spore spherical or ellipsoidal, 13-19 

 (j. in diameter, lying loosely in the gametangium, with a thick rough 

 wall, contents granular, with one or several large globules, after fer- 

 tilization the gametangium collapsing somewhat and soon disintegrat- 



ing. 



In oogonia of Characeae, Switzerland. 



