982 AQUATIC PHYCOMYCETES 



Schulz (1922: 149, fig. 87) has figured in Micrasterias rotata, from 

 Danzig, the empty sporangia and resting spores of a fungus which is 

 very similar to Myzocytium irregulare. 



The two-celled forms of this species resemble Bicricium (see p. 188). 



? Myzocytium lineare Cornu 

 Ann. Sci. Nat. Bot., V, 15: 21. 1872 



Sporangia tubular, simple or branched, never ovoid, disposed in 

 rows; oogonia very tubular, swollen, and irregular. 



In desmids, France. 



Cornu (1877b) identified with his incompletely described species 

 certain fungi found by Reinsch (1878: 300, pi. 17, figs. 5, 14) only in 

 Cosmarium spp. (Type II). It is not clear from Reinsch's figure whether 

 the twisted complex of tubes {op. cit., fig. 5) consists of one or more cells. 

 De Wildeman (1895a: 57) doubts that the fungus belongs in Myzo- 

 cytium. Cejp( 1933a: 8) considers it disputable whether the form belongs 

 to Lagenidium or to Myzocytium, although he favors the latter. Since 

 the zoospores were not observed by either Cornu or Reinsch the fungus 

 may belong in the Chytridiales. 



LAGENIDIUM Schenk 



Verhandl. Phy.-Med. Gesell. Wurzburg, A. F., 9: 27. 1859 



(Figs. 79 D-E, p. 977; 80-82, pp. 987, 1002, 1034) 



Resticidciria Dangeard, Le Botaniste, 2:96. 1890-91. 



Thallus endobiotic, occupying one cell or extending through several 

 cells of host, holocarpic, without specialized vegetative structures, 

 either a one-celled and saccate body or a more or less extensive, irregu- 

 larly branched or unbranched tube which at maturity becomes trans- 

 versely segmented to form the rudiments of the zoosporangia or game- 

 tangia or both, contents at first having a dull clear lustrous matrix 

 within which are imbedded more refractive, irregularly shaped large 

 clods and fat droplets, later becoming evenly and coarsely granular 

 and vacuolate, walls giving a cellulose reaction, zoospore cyst and 

 infection tube frequently persistent; each of the zoosporangia bearing a 



