CHYTR1DIALES 369 



eccentric globule and a long flagellum, emerging singly through from 

 two to five pores formed upon the deliquescence of the papillae ; resting 

 spore spherical, with a moderately thick colorless wall, 13.2[jl in 

 diameter, contents with numerous small oil droplets, germination not 

 observed. 



On Zygnema sp., Hungary. 



SUBFAM. ENTOPHLYCTOIDEAE 



Sporangium endobiotic, resting spore endobiotic; vegetative system 

 rhizoidal; zoospore cyst usually evanescent. 



ENTOPHLYCTIS Fischer 

 Rabenhorst. Kryptogamen-Fl., 1 (4): 114. 1892 

 (Fig. 22, p. 371) 



Thallus endobiotic, monocentric, eucarpic, consisting of the evanes- 

 cent epibiotic cyst of the zoospore and the endobiotic rudiment of the 

 sporangium or resting spore and a rhizoidal system arising from it; spo- 

 rangium inoperculate, with a discharge tube the tip of which at least is 

 extramatrical; zoospores posteriorly uniflagellate, usually with a single 

 globule, formed within the sporangium, escaping upon the deliquescence 

 of the tip of the discharge tube ; resting spore thick-walled, endobiotic, 

 borne like the sporangium, apparently asexually developed, upon 

 germination forming zoospores in an externally produced sporangium. 



Primarily inhabitants of fresh-water green algae. Several species have 

 been described by Nemec (1912) as parasites of phanerogams. 



There is some question as to the precise method of development of 

 the thallus in Entophlyctis. All the earlier investigators stated that 

 the rhizoids are outgrowths of the rudiment of the sporangium — the 

 endobiotic part of the thallus being first established. Indeed, Karling 

 (1928a), in an hour-by-hour account of the formation of the sporangial 

 rudiment in E. helioformis, has described and figured such a sequence. 

 Later, however, (1931a) he observed that in "2s. cienkowskiana" (now 

 E. confervae-glomeratae) the rudiments of the rhizoidal system are laid 

 down first by the penetrating zoospore. Thereafter, by a subsequent 



