SAPROLEGNIALES 811 



breaking through the dorsal side of the host and extending to the outside; 

 primary zoospores moving within the sporangium, pyriform, flattened 

 and grooved on one side, 3.5 by 2.5-2.8 \x, with numerous fat drops, one 

 or two vacuoles and two nearly equal, about 5.5 u. long, oppositely 

 directed flagella that are inserted in the groove, after a period of motility 

 encysting, cysts spherical, 3.5 \x in diameter; secondary zoospores not 

 observed; resting spore not observed. 



Parasitic in Eunotia arcus, Austria. 



A few cytological observations are given by Friedmann. 



RECENTLY DESCRIBED TAXA l 



Ectrogella eurychasmoides J. and G. Feldmann 

 Rev. Mycologique, 20: 238, fig. 1. 1955 



Sporangium ovoid, 35-40 u. by 20-25 y., nearly filling the host cell, 

 mostly with two broad discharge tubes of unequal length, one behind 

 the other, which penetrate the siliceous connective face of the host; 

 zoospores dimorphic, the primary ones elongate-ovoid, asymmetrical, 

 biflagellate, 2.5-3 [x long, and undergoing swarming within the sporan- 

 gium after which they encyst, secondary zoospores not seen; resting 

 spore spherical, 16-18 \x in diameter, with a stratified wall 3-3.5 y. 

 thick, contents with a large eccentric vacuole and oil globule, germi- 

 nation not observed. 



Parasitic on Licmophora lyngbyei (marine), France. 



Ectrogella marina (Dang.) J. and G. Feldmann 



Rev. Mycologique, 20: 238, fig. 2. 1955 



Olpidium marinum, Dangeard, Le Botaniste, 12:XVI, figs. 23, 24. 1912. 



Sporangium, when occurring singly within the cell, ovoid, 8-12 y. by 

 7-8 \x, when several, spherical and 5-6 y. in diameter, with a single 

 lateral cylindrical discharge tube which extends 5-8 y. beyond the host 

 wall; zoospores eight to sixteen in a sporangium, ovoid, somewhat 

 elongate, sometimes reniform, 3-4 y. long, biflagellate (?), upon emer- 

 gence forming a moving compact cluster near the orifice of the discharge 



1 Not included in the key. 



