CHYTRIDIALES 373 



domonas?) mucosus, Braun (he. cit.), Chlamydomonas pulvisculus (coll. 

 Pringsheim), Braun (1856a: 57), Gloeocystis or Gloeococcus mucosus, 

 Kloss (in Braun, 1856b: 588), Gloeococcus {?), Zopf {he. cit.), Germany; 

 Gloeococcus mucosus, Sorokin (1874b: 10, pi. 1, figs. 11-43; 1883:32, 

 fig. 36), Russia; Gloeococcus, de Wildeman (1890: 10), Belgium; 

 Chlamydomonas sp., Constantineanu (1901:382), Rumania; Euglena 

 sp., Berczi (1940:86, pi. 2, fig. 38), Hungary. 



Sparrow (1936a: 451, pi. 14, figs. 7-9) tentatively referred a fungus 

 on resting cells of Euglena sp. in England to this species. However, 

 since no rhizoids were observed in the dense contents the fungus might 

 have been a species of O/pidium. Indeed, the same might be said of 

 Braun's specimens. It was only after Zopf extracted the chlorophyll 

 of his host plants that he was able to detect the rhizoids. 



Zopf, to whom we owe most of our knowledge of the species, found 

 it during February and March in several localities. It caused an epidemic 

 of nearly three weeks' duration in one pond, where very few of the 

 millions of algal cells escaped infection. He confirmed the observation 

 of all investigators of the species, namely, that actively moving swarm 

 cells of the alga were attacked by the fungus zoospores. 



Braun states that the epibiotic cyst of the infecting zoospore and the 

 germ tube are persistent in this species, the former producing the 

 apiculus, the latter, the body of the sporangium. ZopPs figures bear 

 out these observations. 



Entophlyctis bulligera (Zopf) Fischer 



Rabenhorst. Kryptogamen-Fl., 1 (4): 116. 1892 



(Fig. 22 F, p. 371) 



Rhizidium bulligerum Zopf, Nova Acta Acad. Leop. -Carol., 47: 195, pi. 

 18, figs. 5-8. 1884. 



Sporangium spherical, variable in size, with an epibiotic knoblike 

 or ovoid part — the body of the infecting zoospore — which functions as 

 a discharge tube at maturity, wall slightly thickened, smooth, colorless; 

 rhizoidal system extensive, branched, often passing through several 

 cells of the alga, arising from a single point on the underside of the 

 sporangium or from numerous places on the lower half, rhizoids often 



