322 AQUATIC PHYCOMYCETES 



globule and flagellum 15 jx long, or somewhat oval, 3.5 by 1.8 u,, with 

 an oil globule and an anterior minute rod-shaped oscillating granule, 

 moving away directly from the sporangium or resting a short time at 

 the orifice before assuming motility, movement hopping; resting spore 

 sexually formed with its thick-walled clavate germ tube persistent, 

 lying on the surface of the host cell, oval, spherical, 7.5-13 u. in diam- 

 eter, or ellipsoidal and 13.6 \x long by 10.2 \x broad, wall thick, smooth, 

 granular, papillate, or spiny, contents with a large eccentric globule 

 or numerous scattered ones, at germination functioning as a prospo- 

 rangium and forming a thin-walled zoosporangium; male thallus cla- 

 vate, connected by a tube to the base of the receptive thallus, which 

 becomes the resting spore. 



Parasitic in nonsexual colonies of Pandorina morum, 1 Schroder (be. 

 cit.), Germany; Bartsch (comm.), United States; Eudorina elegans, 

 Ingold (1940: 102), Griffiths (1925: 75), Canter (1946: 128, figs. 1-5, 

 pi. 7; 1951: 153), Great Britain. 



Skvortzow (1927:206, figs. 5-8) reported this fungus from Man- 

 churia. No bushy rhizoids nor resting spore were observed; hence, 

 his organism may be referable tc Rhizophydium eudorinae (see p. 281). 



Dangeardia laevis Sparrow and Barr 



Mycologia, 47: 549, figs. 1-20. 1955 



(Fig. 20 D-E, p. 330) 



"Zoosporangium flask-shaped or pyriform, embedded in the gelat- 

 inous sheath, zoospore cyst forming the apex of the somewhat elon- 

 gated neck, 22-38 [j. in total length by 8-16 u, in diameter, neck 4.8 u. 

 in diameter, wall smooth, colorless, slightly thickened; rhizoids several, 

 short, unbranched; zoospores globose or ovoid, 3.2-4.8 u. in diameter, 

 with a posterior flagellum 8-16 u, long and an eccentric colorless re- 

 fractive globule 1-1.6 [j. in diameter, the first ones to emerge resting 

 in a cluster at the orifice before assuming motility, the later ones emerg- 

 ing singly and swimming away at once, movement hopping; resting 

 spore immersed in the gelatinous host sheath, globose, with a long, 

 broad, persistent germ tube, terminated by the somewhat wider and 



1 According to Hood (1910), the host figured is Eudorina elegans. 



