532 AQUATIC PHYCOMYCETES 



in diameter, wall smooth, colorless; rhizoids not clearly seen; zoospores 

 spherical, 3 \i in diameter, with a prominent colorless basal globule 

 and a fairly long flagellum, emerging from a point on the sporangium 

 and forming a large mass from which they slowly escape. 



On the cortical cells of Elodea canadensis, France. 



As suggested by Dangeard, this is probably an incompletely observed 

 species of Cladochytrium. It should be noted, however, that the spo- 

 rangia are said to be "sur les cellules'" rather than inside. 



? Chytridium euglenae Braun 



Monatsber. Berlin Akad., 1855: 382; Abhandl. Berlin Akad., 1855: 47, pi. 4, 



figs. 26-27. 1856 



Phlyctidium euglenae (Braun) Sorokin, Arch. Bot. Nord France, 2: 20, 

 fig. 16. 1883 (separate). 



Sporangium inoperculate, extramatrical, somewhat irregularly tub- 

 ular, with a small knoblike sterile continuous basal or lateral part 

 resting on the host cell, 50-66 \i long by 16-33 u. in diameter; endobiotic 

 part not observed; zoospores ovoid, longer than wide, 3.3 \x long, 

 with a basal colorless globule and a smaller anterior vacuole, flagellum 

 about three times the length of the body, escaping through a pore formed 

 at the tip of the sporangium ; resting spore not observed. 



Parasitic on resting cells of Euglena viridis, coll. von Siebold and 

 Meissner, Braun (loc. cit.), Germany; encysted Euglena, Sorokin (/oc. 

 cit.\ 1874b: 7, pi. 1, figs. 12-17), Russia. 



Because of the lack of information on the vegetative system the 

 species cannot be placed generically with certainty. Fischer and Minden 

 have referred it to Polyphagus euglenae, but this course seems hardly 

 justified because of the differences in shape of the sporangium, the 

 formation of zoospores in the sporangium, the bulbous base, and 

 colorless globule of the zoospore. On the other hand, the fungi collected 

 by Bail and Gross and later mentioned by Braun (loc. cit.) in his 

 discussion of this species probably are referable to Nowakowski's 

 Polyphagus. Braun (1856b: 592) subsequently referred Bail's fungus to 

 Rhizidium. 



Rhizidium (= Phlyctochytriuin) euglenae of Dangeard (1889b: 64) 

 approaches closely the fungus found by von Siebold and Meissner. 



