OF SOUTH AUSTRALIA. 
409 
Taylor (1937) believes that Cl. spongiostis 
(Lightfoot) C. Agardh is not distinct enough from 
the above to be segregated from it, and we have 
followed him in this respect. 
Stypocaulon Kiitzing 1843. 
8. funiculare (Mont.) Kiitzing. Eastern Bays. 
• S. paniculatum (Suhr.) Kiitzing. Eastern Bays, 
Encounter Bay, Holdfast Bay. 
(iii.) Tilopteridales Kylin 1917. — Plants filamentous, branched 
and polysiphonious ; growth trichothallic or localized 
intercalary, the segments ultimately undergoing limited 
longitudinal division ; sporophyte and gametophyte 
phases of similar appearance ; the reproductive history 
somewhat confused, but apparently involving sperms and 
eggs. About five genera and 10 species. 
Tilopteridaceae Thuret 1855. Not known to be repre- 
sented here. 
(iv.) Cutleriales Oltmanns 1922. — Sporophyte and gameto- 
phyte phases of similar or dissimilar appearance, where 
different the gametophyte being larger than the sporo- 
phyte ; plants monoecious or dioecious, disc-like to ribbon- 
like with entire or lobed margins; growth trichothallic; 
reproduction by iso- or aniso-gametes and spores in 
sporangial sori. 
Cutleriaceae Zanardini 1843. Not known to be repre- 
sented here. 
(v.) Dictyotales Kjellman 1893. — Sporophyte and gameto- 
phyte phases of similar appearance; plants monoecious 
or dioecious bearing sperms and eggs Aggregated into 
definite sori ; sporophyte producing tetrads of non-motile 
spores in sporangia. About 18 genera and 100 species. 
Dictyotaceae Harvey 1852. 
Gymnosorus J. Agardh. 
G. variegatus (Lamour.) J. Agardh. Holdfast 
Bay. 
% G. nigrescens (Sond.) J. Agardh. Port Noar- 
lunga, Holdfast Bay, Investigator Strait. 
Homoeostrichus J. Agardh. 
H. spiralis J. Agardh. Encounter Bay, Port 
Noarlunga. 
H. stuposus (R. Br.) J. Agardh. Eastern Bays. 
H. canaliculatus J. Agardh. Eastern Bays. 
Zonaria (C. Ag.) J. Agardh 1872. 
Z. Turneriana J. Agardh. Eastern Bays, Encoun- 
ter Bay, Port Noarlunga, Investigator Strait. 
