458 AQUATIC PHYCOMYCETES 



rangium ; aplanospores spherical, with a small eccentric colorless globule, 

 germinating in the sporangium or upon the rupturing of its wall, free 

 in the medium; resting spore ovoid, acuminate, 31.5 \x long by 23.5 u, 

 wide, thick-walled, pale brown, the outer surface covered with minute 

 spines, contents with a single globule, germination not observed; con- 

 tributing thallus ovoid, smooth-walled. 



Parasitic on Draparnaldia glomerata, Serbinow (loc. tit.), Russia; 

 Draparnaldia plumosa, Graff (1928: 166), United States. 



The immature thallus on Draparnaldia from Denmark figured by 

 Petersen (1909:410, fig. 20b; 1910: fig. 20b) and doubtfully assigned 

 to Sporophlyctis rostrata is probably this species. 



Sporophlyctis chinensis, nom. nov. 

 Polyphagia rostratus (Serb.) Shen, Amer. J. Bot., 31: 233, figs. 1-21. 1944. 



"Thallus holocarpic, hyaline, containing several refractive globules, 

 polyphagous, attached to the algal filaments by means of the thread-like 

 rhizoids which grow out from all parts of the plant, variable in shape 

 and size, measuring 21-31 X 16-22 jx. Asexual reproduction by means 

 of zoosporangia; mature thallus budding out an outgrowth which 

 gradually enlarges and becomes a sporangium, spherical to elliptical, 

 17-21 X 25-29 (x. Sporangium quickly disintegrating after the emer- 

 gence of the zoospores. Zoospores ovoid, 8-8.5 x 5.8-6.5 \l, posteriorly 

 uniflagellate, with a central refractive body 2.5 jj. in diameter, flagellum 

 up to 28 [x long; swimming away directly from the sporangium without 

 delay. 



"Sexual reproduction by conjugation between two individuals; the 

 smaller individual (18-21 X 4-6 jx) when conjugating with the larger 

 one (16.4-18 x 31.2-36.6 jx), becoming spiny and finally being con- 

 verted into the zygote. Mature zygotes spherical or subspherical (1 5.6-18 

 X 18-20.5 jx), yellowish brown, strongly spiny (spines 1 [x long), thick- 

 walled, containing a central oily globule 11.4 jx in diameter. Germi- 

 nation unknown." (Shen, loc. tit.). 



Parasitic on Draparnaldia sp., China. 



Distinguished from Sporophlyctis rostrata by the lack of an apiculus 



