414 
THE SEAWEEDS 
Alariaceae Setchell 1925. 
Ecldonia Hornemann 1828. 
E. radiata (Turn.) J. Agardh. Eastern Bays, 
Encounter Bay, Port Noarlunga. 
E. lanciloba Sonder. Great Australian Bight. 
Lessoniaceae Setchell 1925. 
Macrocystis C. Agardh 1820. 
M. pyrifera (L.) C. Agardh. Eastern Bays, 
Encounter Bay. 
(c) CYCLOSPOREAE Areschoug 1847. — Cytological alternation of 
generations present, the mature plant being the sporophyte. 
Fucales Kylin 1917. — Division into families varies with the 
authority, e.g., De Toni (4), Kylin and Taylor (1), Set- 
chell and Gardner (2), and Tilden (2). 
De Toni : Fucaceae, Sargassaceae, Durvilleaceae, 
Splachnidiaceae. 
Setchell & Gardner, Tilden: Fucaceae, Sargassaceae. 
Kylin, Taylor: Fucaceae. 
We have followed Setchell & Gardner (1925) and 
Tilden (1935) and have retained two families. 
Fucaceae (Lamouroux 1813) Setchell & Gardner 1925. 
Adenocystis Hooker and Harvey 1847. 
A. lessonii Hooker and Harvey. Eastern Bays, 
Encounter Bay. 
Splachnidium Greville. 
S. rugosum (L.) Greville. Encounter Bay. 
Notheia Baily and Harvey 1855. 
N. anomala Baily and Harvey, usually parasitic on 
Hormosira. 
Hormosira Endlicher 1836. 
H. Banksii (Turner) Decaisne. Encounter Bay, 
Gulf St. Vincent 3 Investigator Strait. 
This species may be divided into a number of 
forms, but an ecological study of it is required. 
Myriodesrna Decaisne 1841. 
M . integrifolium Harvey. Holdfast Bay (von 
Mueller), but not since collected. 
M. semdata (Lamour.) Decne. Encounter Bay. 
M. tuberosum J. Agardh. Encounter Bay. 
This species is apparently very rare and Agardh 
records that the specimen collected in 1897 by 
Jessie L. Hussey at Port Elliot had only been 
recorded once previously. 
