140 AQUATIC PHYCOMYCETES 



cal, with a small centric yellow-orange globule and a long posterior 

 flagellum, formed in the sporangium as well as in an extramatrical 

 vesicle which is extruded through a wide sessile pore to the outside 

 of the host cell, escaping upon the dissolution of the vesicle, movement 

 hopping; resting spore not observed. 



Parasitic in Euglena sp., France (rare). 



The species differs from other members of the genus in the method 

 o\' formation of the zoospores. Further observations may indicate 

 that it should be segregated from Olpidium. At maturity the sporan- 

 gium opens by a sessile pore to the outside of the host and there forms 

 a sac equal to or exceeding the endobiotic part in size. The proto- 

 plasm of both parts is then quickly divided into zoospores. In this 

 unusual instance the endobiotic part functions both as a prosporan- 

 gium and a sporangium. From Dangeard's Figure B it is also appar- 

 ent that sometimes at least the globules of the spores are already 

 organized before extrusion of the vesicle. 



Olpidium hantzschiae Skvortzow 

 Arch. Protistenk., 51 : 430, text figs. 3-4. 1925 



Sporangia spherical, from nine to twenty-seven in the abnormally 

 swollen host cell, 3.4-5.5 u. in diameter, without projecting discharge 

 papilla or tube, opening by a pore; zoospores at first spherical, then 

 egg-shaped, with a colorless oil droplet and a long flagellum, 3.4 jx 

 long by 1.5-1.7 \x in diameter; resting spore spherical, 5-6 u. in diam- 

 eter, with dense plasma and a smooth wall, germination not observed. 



In Hantzschia amphioxys, Manchuria. 



In its small size, lack of a discharge tube, and general habit the 

 organism strongly resembles a flagellate, particularly Aphelidium. 



Olpidium pendulum Zopf 



A. Schenk, Handbuch d. Bot. . . , 4: 555, fig. 66 (1-5). 1890 



Sporangia spherical, with a slightly thickened smooth wall, up to 



twelve in a host cell, up to 30 \x in diameter and with a short broad 



discharge tube when occurring singly, smaller and with a long narrow 



discharge tube when there are several in a cell; zoospores spherical, 



