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THE SEAWEEDS 
Viva Linnaeus. 
V. lactuca Linnaeus. Holdfast Bay, Encounter Bay, Investigator 
Strait, Eastern Bay (probably occurs all along South Aus- 
tralian coast). 
V. rigida C. Agardh. Investigator Strait. Sometimes considered 
as a variety of 17. lactuca Linnaeus. 
U. lima Linnaeus. Investigator Strait. Sometimes placed in 
Enteromorpha as the stipe is usually hollow but not the blade. 
Enteromorpha Link. 
E. compressa (L.) Greville. Holdfast Bay, Encounter Bay, 
Eastern Bays. 
E. intestinalis (L.) Link. Encounter Bay. 
E. crinita (Roth.) J. Agardh. Eastern Bays. 
E. clathrata (Roth.) J. Agardh. Holdfast Bay, Encounter Bay, 
Eastern Bays. 
Y. SCHIZOGONIALES. 
Thallus filamentous, plate-like, or as solid cylinders. Cells uninucleate, 
with a single stellate chloroplast. Some marine species, but none recorded 
from South Australia. 
VI. CLADOPHORALES. 
Multicellular forms, with the cells united end to end in simple or branch- 
ing filaments. Cells always multinucleate, with numerous discoid chloro- 
plasts which may be free or united by strands. Asexual reproduction by 
zoospores or non-motile spores; sexual reproduction either isogamous or 
oogamous. Both marine and fresh-water species are known. This order 
was formerly placed in the Siphonocladiales, but appears to be related to 
the Ulotrichales, and is now considered a distinct order. 
Family Cladophoraceae.— Chloroplasts evenly distributed in the cyto- 
plasm of the cells. 
Chaetomorpha Kutzing. 
C. Darwinii (II. & II.) Kutzing. Holdfast Bay, Encounter Bay, 
Eastern Bays. 
C. coliformis Montagne. Encounter Bay. 
C. aerea (Dillw.) Kutzing. Port Noarlunga. 
Cladophora Kutzing. 
C. valonioides Sonder. Investigator Strait, Encounter Bay. 
C. nitidula Sonder. Investigator Strait. 
C. conformis Reinbold. Eastern Bays. 
C. Daveyana Reinbold. Investigator Strait. 
VII. OEDOGONIALES. 
Cells uninucleate, serially united in simple or branched filaments. This 
order is distinguished by their unique method of cell division, involving 
annular splitting of the lateral wall. All species are fresh-water in habit. 
