328 AQUATIC PHYCOMYCETES 



(commonly 4 \x) in diameter, hyaline, containing a refractive globule, 

 with a posterior flagellum; resting spores not observed. (Modified from 

 Kobayasi and Ookubo.) 



On Gracillaria confervoides (marine), Japan. 



Somewhat resembling the fresh-water Rhizophydium messanense (p. 

 296), but, since a pronounced apophysis is typically formed, the species 

 is placed in Phlyctochytrium. 



Phlyctochytrium equale Atkinson 

 Bot. Gaz., 48:338, fig. 8. 1909 



Sporangium sessile, spherical, 5-7 u. in diameter, with a short apical 

 discharge tube 1.5 u, high by 2 \x in diameter, wall thin, colorless; 

 rhizoids delicate, branched, of limited extent, arising from the base 

 of the spherical subsporangial apophysis, which is equal to the spo- 

 rangium in diameter (5-7 jx); zoospores not described; resting spore 

 not observed. 



Parasitic on Spirogyra insignis, Atkinson {he. cit.), S. spreeiana, 

 Graff (1928: 162), United States. 



Graff pointed out that the toothlike projections described by At- 

 kinson as being on either side of the exit pore are in reality the side 

 walls of the short discharge tube viewed in optical section. He also 

 states that there is no cross wall separating the endo- and epibiotic 

 parts of the fungus and that the sporangium is not spherical but dumb- 

 bell-shaped, and neither wholly outside nor wholly inside the host. 

 Further observations on this feature, which, incidentally, has also been 

 noted by Schenk in Phlyctochytrium lagenaria, are needed. Atkinson 

 did not see zoospore discharge, and Graff describes it as occurring 

 "in a manner typical for the genus." 



Phlyctochytrium longicollum Sparrow 



Mycologia, 44: 763, fig. 1 j. 1952 



(Fig. 20 A, p. 330) 



Sporangium sessile, spherical, smooth-walled, 1 7—20 ;jl in diameter, 

 bearing at maturity a cylindrical, straight or somewhat undulating 

 discharge tube 18-20u. in length by 5 u. in diameter; rhizoids delicate, 



