THE TYSON COLLECTION OF MARINE ALGAE 
(Robben Island, Kalk Bay, Knysna, Port Elizabeth, Port Natal. 
Barton (l).) 
U.fasciata, Del. 
Kei mouth, Cape Morgan. 
(Cape Point, Kalk Bay. Barton (i).) 
U. uncialis, Suhr. 
Table Bay. 
(Robben Island, Cape Agulhas. Barton (l).) 
Note. Miss Barton (l) recognises a variety of U. lactuca, viz. U. lactuca 
var. rigida. Amongst Tyson’s specimens of this species at least 
two distinct forms may be recognized. One has a dark green 
frond of a somewhat leathery texture, and judging from Harvey’s 
figure and description (6) is his U. latissima, Linn. Possibly this 
is Miss Barton’s U. lactuca var. rigida. The other form is much 
more delicate in texture and is a pale yellowish green. 
3. Letter stedtia insignis, Aresch. 
Kowie. 
(Port Natal, Port Elizabeth, Port Alfred. BartonP, 2).) 
Note. In one of our Kalk Bay collections there was a small piece of a 
plant which was obviously a Letter stedtia. We have not been 
able to determine the species. Possibly it is a new one as there 
is no record of any Letterstedtia on the Cape Peninsula. 
4. Enter omorpha compressa, Kiitz. 
Table Bay, Cape Morgan. 
(Sea Point, Knysna. Barton(i).) 
E. intestinalis , Link. 
Cape Morgan. 
(Cape Agulhas, Cape. Barton (i).) 
E. rhacodes, Holmes. 
Kowie. 
E. sp. (very near E. percursa, (Ag.) Harv., if not a rather coarse 
form of that species.) 
Cape Morgan. 
Note. In addition to the above, Miss Barton(i) has records of the fol- 
lowing species: E. flexuosa, J. Ag., Cape; E. bulbosa, Kiitz., 
Robben Island, Table Bay, Sea Point, Cape Point, Kalk Bay, 
Knysna; E. Lima, J. Ag., Cape; E. clathrata, Roth., mouth of the 
Olifants River, Algoa Bay. A sheet containing a young specimen 
of E. rhacodes shows a second species mixed up with it. This species 
is a slender branched one and is probably E. clathrata. One sheet 
in the collection has two distinct specimens on it. The top one 
is a large flat thallus which on sectioning shows itself not to be 
