986 AQUATIC PHYCOMYCETES 



In Green Algae 



Discharge tube strongly expanded beneath the host wall; 



in Closterium L. closterii, p. 1001 



Discharge tube cylindrical throughout; in Oedogonium 



L. marchalianwn, p. 1003 

 In animal substrata 



Saprophytic on human skin L. humanum, p. 1005 



Parasitic in animal tissue 



In microscopic animals and mosquito larvae L. giganteum, p. 1005 

 In eggs and newly hatched young of blue crab (Callinectes) 



L. eallineetes, p. 1006 



Lagenidium cyclotellae Scherffel 



Arch. Protistenk., 52: 18, pi. 2, figs. 49-59. 1925 



(Fig. 80 F, p. 987) 



Thallus rounded, or by the formation of short lobes more or less 

 irregularly saccate, one-celled, pushing apart the valves of the host, 

 attached to the cyst of the infecting zoospore by the persistent infection 

 tube, forming a single more or less flask-shaped sporangium with a 

 short blunt discharge tube 3 \x long by 3 u. in diameter which protrudes 

 between the separated valves of the host; zoospores from five to six, 

 fully formed in the sporangium, within which motility is initiated, emerg- 

 ing individually from the discharge tube, (primary?) zoospores ovoid, 

 about 6 u, long by 3.5 \x broad, with two oppositely directed flagella, 

 about 6 [x long, which arise subapically from the concave side of the 

 body, contents bearing a posterior parietal refractive fat body, secondary 

 zoospores not observed; plants dioecious, the gametangia like (?) the 

 sporangia, wall of the male gametangium collapsing after fertilization; 

 female gametangium completely filled by the resting spore; resting spore 

 spherical, 10 \x in diameter, or broadly ovoid or occasionally somewhat 

 angular or irregular, 10-12 \x long by 8-10 \i wide, with a smooth thick 

 colorless wall, dense glittering parietal contents, a large eccentric lus- 

 trous globule, and a lateral bright spot, germination not observed. 



In Cyclote/la kutzingiana, Hungary. 



Scherffel justly emphasizes the close similarity of the zoospore dis- 

 charge in this remarkable species to that in both Olpidiopsis and 

 Ectrogella. (The fungus also resembles most species of Olpidiopsis in 



