528 AQUATIC PHYCOMYCETES 



Chytridium megastomum Sparrow 



Dansk Bot. Ark., 8 (6): 21, pi. 4, A-D. 1934 



(Fig. 31 0, p. 496) 



Sporangium sessile, obpyriform, 12-18 [a high, diameter at the base 

 5-7 [i, increasing distally to 10-15 [x at the apex, wall smooth, colorless; 

 rhizoids rudimentary, sparingly branched, arising from a single stalk; 

 zoospores spherical, 3 [i in diameter, with a small colorless slightly 

 eccentric globule, discharged through a broad usually somewhat sub- 

 apical pore 8-10 [x in diameter formed upon the dehiscence of a large 

 convex operculum; resting spore not observed. 



Parasitic on the setae of Striaria attenuata, Sparrow (be. cit.), Den- 

 mark; Ceramium diaphanum, Sparrow (1936b: 255), United States. 



Distinguished from its closest marine relative, Chytridium polysipho- 

 niae, by the obpyriform shape of its sporangium and the subapical oper- 

 culum. 



RECENTLY DESCRIBED TAXA l 



Chytridium neochlamydococci Kobayashi and Ookubo 



Rept. Osegahara Gen. Sci. Surv. Comm, 1954: 571, fig. 13. 1954 



Sporangia gregarious, epibiotic, ovoid or citriform, 8-10 \i high by 

 6.5-8 jjl broad, with an obconical base and smooth, hyaline, thin wall 

 and apical papilla surmounted by a discoid, 4-5 \l in diameter, opercu- 

 lum; endobiotic part with a poorly developed, or obscure elongate- 

 obconical apophysis from which emerge distally a simple or two-to 

 three-branched rhizoidal system of limited extent; zoospores about five, 

 globose, 4-5 \x in diameter; resting spore not observed. 



Parasitic on Chlamydomonas nivalis in "red snow," Japan. 



Text in Japanese. Description in Latin. 



Chytridium parasiticum Willoughby - 



Trans. Brit. Mycol. Soc, 39: 135, figs. 5-7. 1956 



Sporangium pyriform, 8-27 \l long by 6-22 [x wide with a narrow 



1 Not included in the key. 



- See also Willoughby, in loc. cit., 41:309-319, 1958, where a multioperculate 

 chytrid on Mucor is described. 



