336 AQUATIC PHYCOMYCETES 



Phlyctochytrium papillatum Sparrow 



Mycologia, 44: 764, fig. 1 p-q. 1952 



(Fig. 20 B, p. 330) 



Sporangium sessile, spherical, 23-25 jjl in diameter, with three to 

 five distinctly elevated, discharge papillae, 4 u, in diameter; rhizoidal 

 system moderately coarse, branched, arising from the base of a sub- 

 sporangial endobiotic, somewhat ovoid apophysis ; zoospores spherical, 

 4 [i. in diameter, with a single minute, colorless eccentric globule and 

 a long flagellum, emerging through three to five pores formed upon 

 the deliquescence of the discharge papillae; resting spores sessile, sub- 

 spherical, 27 u, in diameter, with a moderately thick wall beset with 

 numerous stout, blunt, colorless papillae, rhizoidal system like that 

 of the sporangium, germination not observed. 



Parasitic on pine pollen in association with Rhizophidium bulla turn 

 (p. 250). 



The species appears to be nearly identical with that described from 

 pollen grains as "Phlyctochytium n.sp." by Reinbolt (1951 : 197, fig. 9). 



Phlyctochytrium palustre Gaertner 

 Archiv f. Mikrobiologie, 21 : 123, figs. 5-6. 1954 



Sporangium round, somewhat flattened at the base, 10-40 u. in diam- 

 eter, wall smooth, with three to five small, conical papillae, 3 u, long 

 by 2.5 \x at base; rhizoids usually very delicate, one to three axes arising 

 from a 5 \x in diameter apophysis ; zoospores 3-4 u., with one large 

 oil droplet, several small granules and a 25 \x long flagellum, escaping 

 upon the dissolution of the papillae; resting spore spherical, 20-28 u, 

 in diameter with a smooth, 1-1.5 [x thick wall, large oil globule and 

 finely granular contents. 



isolated from soil on pollen, Gaertner (loc. cit.), Germany. 



On nutrient agar the sporangia attained a size of 55 u, but there 

 was no increase (beyond five) in number of discharge papillae. In 

 cultures with diminished bacterial populations there was a tendency 

 for the thalli to be interbiotic on the pollen grains. 



