372 AQUATIC PHYCOMYCETES 



Sporangium predominantly spherical, basal axis delicate 



E. vaucheriae, p. 377 

 Sporangium predominantly spherical, broadly ellipsoidal, 

 or somewhat pyriform, main axis relatively stout 



E. confervae-glomeratae, p. 377 

 Rhizoids arising from three to twelve main axes; in Chara- 



ceae E. helioformis, p. 379 



Protoplasm bright orange at maturity; zoospore lacking a single prom- 

 inent oil globule E. aurea, p. 380 



Entophlyctis apiculata (Braun) Fischer 



Rabenhorst. Kryptogamen-Fl., 1 (4): 117. 1892 



(Fig. 22 A-B, p. 371) 



Chytridium apiculatum Braun, Monatsber. Berlin Akad., 1855:383; Ab- 



handl. Berlin Akad., 1855: 57, pi. 5, figs. 5-20. 1856. 

 Olpidium apiculatum (Braun) Rabenhorst, Flora Europaea algarum, 3: 



283. 1868. 

 Rhizidium apiculatum (Braun) Zopf, Nova Acta Acad. Leop. -Carol., 47: 



207, pi. 21, figs. 21-31. 1884. 



Sporangium broadly pyriform or nearly spherical, its papillate 

 apiculus 3 [j. long, piercing the host wall, main body resting between 

 the retracted host contents and the wall, up to six sporangia in a cell, 

 11-13 u. in diameter, wall smooth, colorless; rhizoids imbedded in the 

 host plasma, short, delicate, sparsely branched, arising from a short 

 main axis; zoospores from three to twenty, small, spherical or ellip- 

 soidal, with an eccentric colorless globule and a long flagellum, escaping 

 upon the dissolution of the apex of the apiculus; resting spore spherical, 

 subspherical, or ellipsoidal, with a thick colorless smooth wall, contents 

 densely granular, rhizoidal system like that of the sporangium, germi- 

 nation not observed. 



Parasitic in immobile and moving cells of Gloeococcus (Chlamy- 



Spirogyra. E. Entophlyctis (?) rhizina (Schenk) Minden in Vaucheria. F. 

 Entophlyctis bulligera (Zopf) Fischer in Spirogyra; epibiotic knob is per- 

 sistent case of zoospore. G-H. Entophlyctis helioformis (Dang.) Ramsbottom 

 in Nitclla: G, mature sporangium bearing stubby rhizoids; H, underside 

 of empty sporangium showing attachment of stubby rhizoids. 



(A-B, F, Zopf, 1884; D-E, Sparrow, 1936a; C, G-H, Sparrow, 1943) 



