386 AQUATIC PHYCOMYCETES 



swelling appears. The distal part of the swelling enlarges more rapidly 

 than the proximal part and becomes the rudiment of the zoosporangium, 

 while the proximal swelling enlarges to become the apophysis. The 

 apophysis, then, appears at the same time as the sporangium." We are 

 inclined to believe that all observations reported are correct and that 

 in this genus, as elsewhere, nothing is static about the precise sequence 

 of development of parts of the thallus. 



KEY TO THE SPECIES OF DIPLOPHLYCTIS 



Resting spore spiny or verrucose 

 Resting spore spiny 



Sporangium typically with one discharge tube 



Resting spore typically spherical, subspherical, or broadly ellip- 

 soidal; primarily in moribund or dead members of the 



Characeae D. intestina, p. 386 



Resting spore typically oval and somewhat bean-shaped; sapro- 

 phytic on vegetable debris D. amazonense, p. 388 



Sporangium typically with more than one discharge tube 



D. sexualis, p. 389 



Resting spore verrucose D. verrucosa, p. 390 



Resting spore smooth D. laevis, p. 390 



Diplophlyctis intestina (Schenk) Schroeter 



Engler and Prantl, Natiirlichen Pflanzenfam., 1 (1): 78. 1892 



(Fig. 23 A-C, p. 385) 



Rliizidium intestinum Schenk, pro parte, Ueber das Vorkommen contract- 

 iler Zellen im Pflanzenreiche, p. 5, figs. 1-9. Wurzburg, 1858. 



Entophlyctis intestina (Schenk) Fischer, Rabenhorst. Kryptogamen-Fl., 

 1 (4): 116. 1892. 



Sporangium predominantly spherical, subspherical, pyriform, or 

 obliquely ellipsoidal, occasionally somewhat cylindrical, clavate, or 

 irregular, variable in size, up to 80 [jl or more in diameter, wall thin, 

 smooth, colorless, discharge tube generally single, cylindrical, slightly 

 tapering distally, of variable length, apophysis appearing basal, variable 

 in shape and size, usually spherical, subspherical, or pyriform and 

 3-6 [jl in diameter; rhizoids richly branched, extensive, up to 400 u, in 

 length, ordinarily arising from a single short basal axis, the main 



