THE TYSON COLLECTION OF MARINE ALGAE 
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L. pinnatifida, Lam. 
Plettenberg Bay. (Also Seal Island, Algoa Bay. Barton(i).) 
L. data, Harv. 
Port Alfred, Kei mouth, Waterloo. 
L. hybrida, J. Ag. 
Kei mouth. 
L. obtusa, Lam. 
Ivowie, Somerset Strand, False Bay, Cape Morgan. (Also Cape 
Agulhas, Algoa Bay. Barton (l). ) 
Note on the genus Laurencia. 
Other species mentioned by Barton are: L. corymbosa,Ag., the Cape; 
L. Botryoides, Ag., Muizenberg, Ivalk Bay, Cape Agulhas; L. divaricata, 
Ag., the Cape; L. Forsteri, Ag., the Cape; L. papillosa, Grev., Cape 
Recife, Algoa Bay, the Cape; L. moriformis, Kiitz., the Cape; L. con- 
cinna, Mont., Port Natal; L. laxa, Grev., the Cape, Natal Bay. 
6. Chondria capensis, (Harv.) J. Ag. 
Rock ledges, Table Bay to W alhsch Bay. 
13. Pachychaeta brachyarthra, Kiitz. 
Shark’s Bay, Ivowie, Port Beaufort. 
Note. P. grijfithsioides is also mentioned by Barton(i). 
15. Polysiphonia virgata, (Ag.) Spreng. 
On stem of Ecklonia buccinalis, Table Bay, Robben Island, 
Mouille Point. (Also Camp’s Bay, Ivalk Bay, Cape Agulhas, 
Kynsna. Barton (i).) 
P. atrorubescens , Grev. 
Rogge Bay. (Also Table Bay. Barton(i).) 
P. sertularioides , J. Ag. 
British Kaffraria, Cape Morgan. (Also Port Elizabeth. Barton, 
1896(2).) 
P. doiophylla, Ag. 
Cape Morgan. (Also Camp’s Bay. Barton (l).) 
This is represented by two specimens named by Flanagan, but 
renamed by Tyson Pterosiphonia doiophylla var. patens, these 
specimens have therefore been placed with the genus Pterosiphonia. 
P. urbana, Harv. 
Tidal rocks, Sea Point (labelled “Fide Miss Barton'’), Three 
Anchor Bay. 
P. urceolata, (Lightf.) Grev. 
Algoa Bay, U.S.A. (Also Table Bay. Barton (l).) 
P. tenebrosa, (Harv.). 
Sand covered rocks and pools, Table Bay. Sea Point, Tlnee 
Anchor Bay. (Also Muizenberg. Barton(i).) We have found 
