HYPHOCHYTRIALES 147 



ANISOLPIDIUM Karling 



Amer. J. Bot., 30: 637. 1943 

 (Fig. 55 J-L, p. 752) 



"Thallus intramatrical, monocentric, olpidioid and holocarpic, var- 

 iable in size and shape. Zoosporangia similar in size and shape to 

 thalli, with one or more exit tubes of variable length. Zoospores anter- 

 iorly uniflagellate. Resting spores similar in size and shape to thalli, 

 thick-walled; germination unknown" (Karling, loc. cit.). 



Parasitic in marine algae. 



KEY TO THE SPECIES OF ANISOLPIDIUM 



Parasitic in Cladostephus, Sphacelaria, and Chaetopteris 



A. sphacellarum, p. 747 



Parasitic in Ectocarpus A. ectocarpii, p. 748 



Parasitic in Pylaiella A. rosenvingii, p. 749 



Anisolpidium sphacellarum (Kny) Karling 1 

 Amer. J. Bot., 30: 641. 1943 



Chytridium (Olpidium) sphacellarum Kny, Sitzungsber. Gesell. Naturforsch. 



Freunde Berlin, 1871: 97; Hedwigia, 11(6): 87. 1872. 

 Olpidium sphacellarum (Kny) Fischer, Rabenhorst. Kryptogamen-Fl., 1 (4): 



26. 1892. 

 Pleotrachelus sphacellarum (Kny) H. E. Petersen, Oversigt Kgl. Danske 



Vidensk. Selskabs. Forhandl., 1905:452, fig. II, 5-8. 

 ? Olpidiopsis sphacellarum (Kny) Sparrow, Aquatic Phycomycetes, p. 629. 



1943. 



Sporangia single or up to nine in a cell, frequently attacking the ter- 

 minal or other cells of the lateral branches and occasionally the apical 

 cell of the main axis, as well as the setae, causing swelling of the infected 

 cell, spherical, subspherical, or oblong, variable in size, 35-45 u. long 

 by 1 7-52 [x in diameter, wall thin, smooth, colorless, bearing from one 

 to three short stout discharge tubes 8-10 ;jl in diameter; zoospores 

 somewhat pyriform, 4 jjl long by 2 [i in diameter, with a colorless 

 granule near the broader posterior end and an anterior flagellum, ini- 



1 According to Professor H. H. Bartlett, this species name should have been 

 "sphacelariarumr Note that the host name has only one "1." 



