784 AQUA TIC PH YCOM YCETES 



budding (?), and eventually forming multinucleate plasmodia, which 

 cleave into uninucleate segments. Cleavage segments developing into 

 small zoosporangia which produce few zoospores. Secondary zoospores 

 reinfecting host and forming additional plasmodia. Sporogenous Plas- 

 modium partly or completely filling host cell, moving slowly in amoe- 

 boid fashion within the host cell and in migrating from cell to cell; 

 occasionally undergoing schizogony into uni- and multinucleate mer- 

 onts; rarely encysting; cleaving into resting spores at maturity" (Kar- 

 ling, 1942d:22). 



Type species: Plasmodiophora brassicae Woronin. 



Parasites of terrestrial and aquatic vascular plants. The known aquatic 

 species are all parasites on marine hosts, on which they produce swell- 

 ings of various types. 



SPECIES IN AQUATIC VASCULAR PLANTS 

 Plasmodiophora diplantherae (Ferdinandsen and Winge) Cook 



Hong Kong Naturalist (Suppl.), No. 1 : 34. 1932; Arch. Protistenk.,80: 194, 



text fig. 9, pi. 6, figs. 5-6. 1933 



Parasitic in Diplanthera wrightii. 



Plasmodiophora halophilae Ferdinandsen and Winge 



Centralbl. f. Bakleriol., Parasitenk. u. Infektionskrankh., Abt. 2, 37; 167, 



3 figs. 1913 

 Parasitic in Halophila ovalis. 



Plasmodiophora bicaudata Feldmann 

 Bull. Soc. d'Hist. Nat. de l'Afrique du Nord, 31 : 173, figs. 1-2. 1940 

 Parasitic in Zoster a nana. 



LIGNIERA Maire and Tison 

 C. R. Acad. Sci. Paris, 152: 206. 191 1 

 "Resting spores not consistently aggregated in cystosori of character- 

 istic shape and structure; variously-shaped with relatively thin hyaline 

 or colored, smooth or verrucose walls. Plasmodium relatively small, 

 partly or completely filling the host cell; segmenting into either zoo- 



