208 AQUA TIC PH YCOM YCETES 



klVTO THE SUBFAMILIES AND GENERA OF THE PHLYCTIDIACEAE 



Sporangium epibiotic or extracellular l , resting spore epi or endobiot- 

 ic; vegetative system varied in nature; zoospore cyst usually 



persistent and functional Subfamily Phlyctidioideae, p. 210 



Body of the encysted zoospore wholly or in part enlarging to 

 form a sporangium, the latter usually sessile, with or 

 without a sterile base 

 Epibiotic or extracellular part completely ferile; endobiotic 

 part varied 

 Endobiotic part a distinctly double-contoured tube, irregu- 

 lar sac, sphere, digitation, or papilla, never branched 

 or tapering 

 Endobiotic part not digitate 



Resting spore completely filling its container 



Phlyctidium, p. 210 

 Resting spore formed in the distal part only of its con- 

 tainer Septosperma, p. 225 



Endobiotic part a complex of blunt digitations arising 



from a central knob Loborhiza, p. 227 



Endobiotic part a single tapering rhizoid or a branching 

 system of rhizoids arising from an apophysis or directly 

 from the tip of the germ tube or a prolongation of it 

 Endobiotic part a tapering rhizoid or a branching system 

 of rhizoids arising from the tip of the germ tube 

 Sporangium and resting spore epibiotic; rhizoids devel- 

 oped to a varying degree; parasitic or saprophytic 



on a variety of substrata Rhizophydium, p. 230 



Sporangium and resting spore extracellular; rhizoids 

 forming a bushy tuft or of small extent; parasitic 



on plankton algae Dangeardia, p. 319 



Endobiotic part with the rhizoids arising from an apo- 

 physis 



Sporangium without an apiculus, the discharge pore usu- 

 ally apical; resting spore epibiotic 



Phlyctochytrium, p. 323 

 Sporangium with an apiculus, and lateral discharge pore; 



resting spore endobiotic Blyttiomyces, p. 354 



That is, imbedded in material of the host, as, for example, in a gelatinous 

 sheath, but resting on the cytoplasm (Dangeardia, etc.). 



