250 Puget Sound Marine Sia. Pub. Vol. 1, No. 25 



The 49 species of Phaeophyceae distributed in 36 genera in Puget 

 Sound fall under the following groups according to Engler's (2) classi- 

 fication. The characterization of groups is somewhat modified. 



I. PHAEOSPORALES. Reproductive organs develojaing from superficial 

 cells. 



1. EcTOCARPACEAE. All reproductive cells motile and produced in uni- 



locular or plurilocular sporangia. Thallus variable, but without 



distinct root-like or blade-like parts. 



Castagnea Leathesia Pylaiella 



Chordaria Mesogloia Ralfsia 



Coilodesme Myelophycus Scytosijihon 



Colpomenia Myrionema Soranthera 



Desmarestia Phycocelis Sphacelaria 



Dictyosiphon Phyllitis Striaria 



Ectocarpus Punctaria 



2. Laminariaceae. Unilocular sporangia present, in large sori; an- 



theridia and oogonia on protonema-like structure, known only in 

 a few species. Plant body variable, differentiated into root-like, 

 stem-like and leaf-like parts (holdfast, stipe and blade), growth 

 intercalary, later with localized intercalary growing region. 



Agarum Egregia Nereocystis 



Alaria Hedophyllum Pleurophycus 



Costaria Laminaria Postelsia 



Cymathere Macrocystis Pterygophora 



II. CYCLOSPORALES. Reproductive organs, antheridia and oogonia, 



produced in sunken conceptacles. No asexual reproduction by mo- 

 tile spores. 



3. FucACEAE. Antheridia many, with many obovate laterally biciliate 



sperms. Oogonia large, with two, four or more commonly eight 

 eggs. Plant body parenchymatous, variable in form, often much 

 branched and with many air bladders. 



Cystophyllum Pelvetia 



Fucus Pelvetiopsis 



III. DICTYOTALES. Asexual reproduction by non-motile spores.' 



Oogonia with one egg. Antheridia producing one uniciliate sperm in 

 each cell. Sexual and asexual generations alternating regularly. 



4. DicTVOTACEAE. Plant body flat, membranaceous, with apical 



growth. 



Dilophus. 



