Table VII. Feldmann's (1946) Subdivision of the Siphonales 



SIPHONALES 



Homoplastic {chloroplast only) 

 Filament wall with cellulose 



Heteroplastic {chloroplast and amyloplast) 

 Filament wall without cellulose 



ORDER Eusiphonales 

 Halicystidaceae 

 Bryopsidaceae 



Bryopsis 

 Codiaceae 



Codium 



ORDER Caulerpales 



Udoteaceae 



Halimeda, Udotea, Avrainvillea, 

 Penicillus, Cladocephalus, 

 Rhipocephalus, Pseudochlorodesmis, 

 Pseudocodium, 



Caulerpaceae 



Dichotomosiphonaceae 



D. tuberosus, D. pusillus 



Table VIII. Feldmann's (1954) Extended Subdivision of the Siphonales 



SIPHONALES, sensu late 



Homoplastic Heteroplastic 



DICHOTOMO- 

 CODIALES DERBESIALES CAULERPALES SIPHONALES 



Life cycle mono- 

 phasic and 

 diplontic 



(Not holocarpic) 



Cycle hetero- 

 morphic 



Zoospores with 

 crown of 

 flagellae 



Gametes strongly Anisogamous 

 anisogamous gametes 



Individual 

 gametangia 

 present 



Codium, 

 Bryopsis 



Individual 

 gametangia 

 absent 



Derbesia 

 Halicystis 



Gametes slightly 

 anisogamous 



Entire thallus 

 involved in 

 sexual repro- 

 duction, and 

 dies thereafter 

 (holocarpy) 



Individual 

 gametangia 

 absent 



Halimeda 



Caulerpa 



Oogamous 



Dichotomosiphon 



