366 AQUATIC PHYCOMYCETES 



SCHERFFELIOMYCES PARASITANS SpaiTOW 



Mycologia, 26: 377. 1934; J. Linn. Soc. London (Bot.), 50: 446, pi. 18, figs. 



14-28. 1936 



(Fig. 21 M-O, p. 360) 



Scherffelia parasitans Sparrow, Trans. Brit. Mycol. Soc, 18:216. 1933. 



Sporangium sessile, at first lachrymose, becoming spherical or sub- 

 spherical at maturity, resting in the concavity formed by the collapsed 

 host cell, 17-22 [x in diameter, joined by a narrow tube of varying 

 length to the spherical (2.5-3 \x in diameter) cyst of the zoospore, 

 contents at first colorless, at maturity charged with orange oil droplets, 

 with a barely perceptible single short unbranched endobiotic tube; 

 zoospores minute, innumerable, spherical or ovoid, 2-3 \x in diameter, 

 with a single orange globule, emerging in a compact mass from the 

 broad mouth of the sporangium and remaining for a few seconds at the 

 orifice, the mass then becoming disorganized as the spores assume 

 motility, movement swimming or strongly amoeboid; resting spore 

 spherical or ovoid, thick-walled, brownish, 8-10 y. high by 10-14 y. in 

 diameter, attached by a narrow, often somewhat curved tube to the 

 spherical (3 [x in diameter) cystospore, germination not observed. 



Parasitic on resting cells of Euglena sp., Great Britain. 



SCHERFFELIOMYCES APPENDICULATUS (Zopf ) Sparrow 



J. Linn. Soc. London (Bot.), 50: 449. 1936 



Rhizidium appendiculatum Zopf, Nova Acta Acad. Leop. -Carol., 47: 203, 



pi. 20, figs. 17-27. 1884. 

 Rhizophydium appendiculatum (Zopf) Fischer, Rabenhorst. Kryptogamen- 



Fl., 1 (4): 101. 1892. 



Sporangium within the gelatinous sheath of the host, sessile on the 

 contents of the alga, pyriform, up to 14 jx long by 1 1 ;x in diameter, 

 with a prominent sometimes elongate apiculus, wall thin, smooth, 

 colorless, cystospore ellipsoidal or ovoid, laterally attached by a short 

 tube to the apiculus, contents colorless; rhizoidal system sparingly 

 branched, arising from the tip of a short axis; zoospores from a few 

 to twenty or thirty, spherical, with a basal colorless globule and a long 

 flagellum, escaping through an apical pore; resting spore borne like the 



