CHYTRIDIALES 357 



ment a rapid darting ; resting spores endobiotic, smooth-walled. (Modi- 

 fled from Sparrow and Barr.) 



On pine-pollen bait in sphagnum-bog debris, United States; pine 

 pollen, Rieth (1956b: 185, fig. 2), Germany. 



More material of this bizarre species was found in Cheboygan County, 

 in 1956, by W. J. Koch. In it anastomosis of the helical bands sometimes 

 occurred. 



Smooth-walled endobiotic resting spores thought possibly to belong 

 to this species were seen and so regarded by Rieth (1956b). 



Blyttiomyces laevis Sparrow 



Mycologia, 44: 765, fig. 1, l-o. 1952 



(Fig. 20 C, p. 330) 



Sporangium sessile, ovate, smooth- walled, 14-17 \x high by 12-16 \i 

 in diameter, with a subapical prominent thick-walled, strongly convex 

 apiculus, 2.5-3.5 jjl high by 3-4 \x in diameter; rhizoids coarse, sparsely 

 branched, arising from a small subsporangial apophysis.; zoospores 

 numerous, slightly ovoid, 3 \x in diameter, with one or two minute, 

 colorless, refractive granules and a long posterior flagellum, escaping 

 through one to three subapical pores; resting spore not observed. 



Parasitic on filaments of Zygnema sp., United States. 



The only smooth-walled member of the genus that is now known. 



IMPERFECTLY KNOWN SPECIES OF BLYTTIOMYCES 



? Blyttiomyces sp. Sparrow 

 Mycologia, 44: 767. 1952 



Sporangium spherical, 12-13 \x in diameter, wall minutely spiny, 

 with an apiculus 3 \l in diameter and one to three discharge pores; 

 endobiotic system consisting of a spherical apophysis 3 jjl in diameter 

 from which a sparingly branched rhizoidal system emerges; zoospores 

 and resting spores not observed. 



On Netrium sp., United States. 



