70 
THE SEAWEEDS 
Common in Western Australia from Geraldton south, and on the south 
coast extending; into South Australia, where it meets the more eastern 
Seirococcus. Both can be gathered together at Victor Harbour. It has 
not been found in Victoria but strange to say was recorded by R. Brown 
from Tasmania, and Mrs. Irvine gathered a specimen at the Tamar Heads. 
Probably the Tasmanian records are of drifted material. 
CYSTOPHORA J. Agardli. 
Large plants attached by a simple conical disc; much branched. No 
true, midribbed leaves; the vegetative system consisting of broader or 
narrower ramuli. A large genus, purely Australian, with very varied 
contours among the species. Vesicles, when present, forming true 
specialized organs, mutic except in C. cephalornithos and C. polycystidea ; 
wanting in C. pectinata , C. xyphocarpa , C. retorta, C. spartioides , C. 
thysanoclada ? , G. paniculata. Receptacles formed of swollen ramuli, 
carrying mostly hermaphrodite conceptacles, with antheridia, oogonia and 
paranemata. 
There are two subgenera — Caulocystis and Eucystophora. 
a. Vesicles springing direct from the stem or 
primary branches Caulocystis 
(Areschoug) De Toni. 
aa. Vesicles springing from ramuli of the last 
order Eucystophora 
De Toni. 
Subgenus Caulocystis (Areschoug) De Toni. 
Main stem stout, undivided, bearing branchings radiating in all direc- 
tions. Branches pinnulate ramulose. Ramuli filiform, the latest growing 
into cylindrical receptacles. 
KEY TO THE SPECIES. 
a. Vesicles spherical mutic C. uvifera (Ag.) 
J. Agardh. 
The southern part of Australia, Tasmania, New^ Zealand. 
aa. Vesicles cylindro-elliptical, api cubit e C. cephalornithos 
(Labill.) J. Agardh. 
South Australia and Victoria to Twofold Bay; Tasmania (Labillardiere) . 
Subgenus Eucystophora De Toni, 
a. Conceptacles in two more regular series. 
b. Whole plant subdistichously pinnate, the pinnae flattened, 
pinnatifid. 
