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THE TYSON COLLECTION OF MARINE ALGAE 
at Sea Point (August 22, 1920), but the tetrasporic plants were much 
less numerous as well as less conspicuous. 
G. Burmanni and G. stiriata, are both abundant especially on the 
west coast and around Table Bay. They are commonly found together 
at low tide levels, and are often exposed by neap as well as spring tides. 
All the specimens of G. Burmanni in the Tyson collection as well as all 
those we have seen growing, are either sterile or tetrasporic, whilst all 
the specimens of G. stiriata are also either sterile or carposporic 1 . The 
structure of the young sterile fronds seems to be identical, but the 
carposporic fronds become papillate whilst the tetrasporic remain 
smooth. It seems very probable that these two “species” are in reality 
simply the sexual and asexual generations of the same plant. Both these 
occur in association with G. radula, which is also abundantly represented. 
7. Gymnogongrus dilatatus , (J. Ag.). 
Low tide Table Bay, rocks and ledges. (Also Green Point, Cape 
Point, Gordon’s Bay. Barton (l).) 
G. capensis, (Ag.). 
Green Point, Table Bay. (Also Cape Point, Kalk Bay, Cape 
Agulhas and Knysna. Barton (l).) 
G. polycladus, (Ivlitz.), Ag. 
Cape Morgan. (Also Kalk Bay. Barton (l).) 
Note. According to Barton, another species, G. corymbosus, occurs at 
Cape Point and at False Bay. 
8. Actinococcus aggregatus, Schm. 
Cape Morgan. 
This is parasitic on Gymnogongrus vermicularis and on G. dilata- 
tus. I have found it on G. dilatatus at extreme low tide at 
Camp’s Bay (Oct. 1920). 
10. Mychodea episcopalis (Harv.). 
Cape Morgan. One specimen. 
13. Callophyllis discigera, J. Ag. 
Not given. (At Table Bay, False Bay, Knysna. Barton(i).) 
C. Hombroniana ( ? ) . 
Waterloo Bay. One sterile specimen. 
Note. According to Barton (l), C. laciniata occurs at Batterie Amster- 
dam, and C.fastigiata at Cape Agulhas. 
15. Callymenia dentata, J. Ag. 
Three Anchor Bay, Great Kei mouth. (Also Cape Agulhas, Algoa 
Bay. BartonO).) 
C. schizophjlla, Harv. 
1 This appears to be true also of specimens of these species in the Harvey Collection (Cape 
Town) and in the British Museum (S. Kensington). 
