114 
THE TYSON COLLECTION OF MARINE ALGAE 
this plant occasionally at Sea Point and also Kalk Bay in 
similar habitats. 
P. corymbosa, (Ag.) Harv. 
P. corymbifera, Ag. Harv. 
Sea Point in pools on Codiurn tomentosum. 
Note on the genus Polysiphonia. 
Other species recorded by Miss Barton are: P. fasciculi/ era, Kiitz., 
the Cape; P. Acanthina, J. Ag. ( Rhytiphlea dumosa, Harv.), False Bay; 
P. prorepens, Harv., Algoa Bay, Port Elizabeth; P. Heringiv, Harv., 
Algoa Bay; P. corymbifera, Ag., Table Bay, Natal; P. arenaria, Houts 
Bay, and Muizenberg; P. incompta, Harv., Muizenberg, Kalk Bay, 
Simon’s Bay; P. Stangeri, Harv., Port Natal; P. monocarpa, Montag., 
the Cape ; P. Gaudichaudi, Ag., the Cape ; P. parasitica, Grev., the Cape ; 
P. nana, Kiitz., Table Bay; P.falcata, Kiitz., the Cape; P. Pappeana, 
Kiitz., the Cape; P. juncea, Kiitz., the Cape; P. linocladia, Kiitz., the 
Cape. — According to Miss Barton ((l), p. 176) : “ Grunow finds no specific 
difference between P. virgata, (Ag.), complanata Sp., Gaudichaudi, J. Ag., 
and fasciculi/ era, Kiitz. I entirely agree with him, except P. complanata 
which seems to me to resemble more nearly P. cloiophylla, Ag.” 
In our experience the species of Polysiphonia are not frequently met 
with excepting P. urbana in tetrasporic form from Glencairn, Kalk Bay, 
and St James, i.e. on the sandstone of False Bay. P. virgata is the only 
species we have observed at Camp’s Bay. 
34. Bostrychia mixta, (Harv.), and Hook. 
Sheltered spots, rock crevices, Algoa Bay, Port Elizabeth. (Also 
Muizenberg, Cape Point, Simon’s Bay, Kalk Bay, Knysna. 
Barton(i).) We have found this plant on sheltered vertical rock 
faces about mid-tide level at Kalk Bay. 
Note. B. tenella, J. Ag. and B. Binderi are recorded by Miss Barton 
as both occurring at Port Natal and False Bay. 
41. Rhodomela botryocarpa, Harv. 
Cape Morgan, Port Nolloth. This is also named Caulacanthus 
ustulatus, Kiitz. 
Note. R. subftisca is also recorded by Barton as occurring at Table 
Bay and Cape Point. 
45. Rerposiphonia Heringii, (Harv.). 
On various algae, Table Bay, Port Natal. 
H. prorepens. 
On Amphiroa Ephedrae, Table Bay. 
50. Placophora Binderiana, J. Ag. 
On Codium, Algoa Bay, Kowie. (Also Port Elizabeth, on Am- 
phiroa and Codium. Barton(i).) 
