408 
THE SEAWEEDS 
CENSUS OF KNOWN SOUTH AUSTRALIAN BROWN 
ALGAE. 
CLASSIFICATION ACCORDING TO KYLIN (1933) AND TAYLOR 
(1936). 
PHAEOPHYCEAE Hauek 1885. — Plants multicellular, varying from 
simple or branched filaments and single-layered membranes to solid bodies 
made up of differentiated tissues ; cells typically uninucleate, with distinct 
walls, containing olive-brown chromatophores ; internal cells in higher 
forms elongated and forming definite mechanical conducting and storage 
systems; outer tissues consisting of absorbing and assimilatory cells; life- 
cycle exhibiting a definite morphological alternation of similar or dissimilar 
generations, or in the Fucales a cytological alternation of generations; 
gametophytes producing similar gametes or sperms and eggs; sporophyte 
producing spores in sporangia, following meiosis. 
(A) ISOGENERATAE Kylin 1933.— Morphological alternation of 
similar generations known or inferred to be present. There are 
five orders. 
(i.) Ectocarpales Oltmanns 1922. — Plants generally filamen- 
tous, branched and uniseriate with an apical, tricho- 
thallic, but more usually an intercalary growing point; 
sporophyte and gametophyte phases similar in appear- 
ance, reproducing by iso- or aniso-gametes ; sporophyte 
phase bearing spores in multiples of four in sporangia. 
There are three families (of which only one is represented 
in South Australia), including about four or five genera, 
but sometimes they are all placed in the one family. 
Ectocarpaceae Harvey 1852. 
Ectocarpus Lyngbye 1819. 
E. confervoides (Roth.) Le Jol. Holdfast Bay, 
Investigator Strait. 
(ii.) Sphacelariales Oltmanns 1922. — Plants generally filamen- 
tous, branched and polysiphonious ; growth from large 
apical cells, the segments from which generally divide 
longitudinally in a regular and characteristic fashion; 
sporophyte and gametophyte phases of similar appearance 
reproducing by zoospores and by iso- or aniso-gametes. 
About 10 genera and 60 species. 
Sphacelariaceae Reinke emend. Oltmanns 1922. 
Sphacelaria Lyngbye 1819. 
S. furcigera I^iitzing 1855. Eastern Bays. 
Cladostephus C. Agardh 1817. 
Cl. verticillatus (Lightf.) C. Agardh. Eastern 
Bays, Encounter Bay, Port Noarlunga, 
Holdfast Bay. 
