588 AQUATIC PHYCOMYCETES 



variable in diameter, spindle shaped or oval swellings numerous or very 

 much scattered. Zoosporangia usually terminal on short lateral 

 branches or occasionally intercalary, smooth, hyaline, operculate, quite 

 variable in shape and size but commonly ovoid, ellipsoid, or pyriform, 

 usually 7.5-14.2 fx X 9.5-28.4 u. (commonly 11.5 x 17.2 jx) with one to 

 several exit papillae (or tubes), apical, subapical, or lateral, varying in 

 length up to 18 [x and usually about 4.0-4.7 ;x in diameter; operculum 

 circular, 3.1-3.5 jx in diameter, either remaining attached to the spo- 

 rangium or lying loose nearby. Zoospores hyaline, spherical or ovoid, 

 4.4-6.3 [x in diameter, with a single refractive globule; cilium attached 

 posteriorly, 32.5-40.0 (x in length. Resting bodies terminal or intercalary, 

 usually somewhat ellipsoidal, containing one to four thick-walled 

 hyaline resting spores and a corresponding number of empty cells. 

 Resting spores rather uniform in size, 8.5-12.6 fx X 11.6-15.6 [x (com- 

 monly 11.0 x 14.2 \x) usually somewhat hemispherical in shape; refrac- 

 tive globule in mature resting spores large with several smaller ones 

 commonly surrounding it. Germination unknown" (Shanor, be. cit.). 



On cellophane, Shanor (be. cit.), Karling (1942c : 620), on cellophane, 

 from soil, Karling (1948c: 510), on cellophane, Sparrow (1952d: 768), 

 United States; leaf bait, Shanor (1944:331), Mexico; cellophane, 

 Haskins (1946: 135), Great Britain; cellophane bait, from soil, Spar- 

 row (1952b: 69), Cuba. 



The species appears to be a common one in both soil and water. Its pe- 

 culiar method of resting-spore formation (Fig. 36 D-F) parallels that 

 found in Septosperma (p. 225) and Nephrochytrium stellatum (p. 575). 



Nowakowskiella elongata Karling 



Bull. Torrey Bot. Club, 71 : 375, figs. 30-44. 1944 



(Fig. 36 C p. 590) 



Rhizoidal system hyaline, profuse, copiously branched, 1-6 u. in 

 diameter, with nonseptate swellings, oval (5-13 by 7-15 \x), broadly 

 fusiform (4-8 by 8-17 jx), or globose (5-15 [x in diameter), with refractive 

 globules; sporangia terminal or intercalary, rarely apophysate, some- 

 times with a basal 1-3 septate sterile portion, straight, elongate-clavate 

 (8-40 by 20-820 jx), cylindrical with swollen apex, curved or coiled 



