104 
THE TYSON COLLECTION OF MARINE ALGAE 
G. rigidum, Klitz. 
Cape Morgan, Kowie. 
G. corneum, Ag. 
Cape Morgan, Kei mouth. (Also Algoa Bay, Port Alfred, Mossel 
Bay, Natal, Sea Point. Barton (l).) 
G. crinale. 
Cape Morgan. (Also Kalk Bay. Delf.) 
G. serratum, Kiitz. ( = Thysanocladia Africana, Schmitz). 
Kowie. Two specimens. 
Note on the genus Gelidium. 
In our experience, the two species cartilagineum and pristioides are 
by far the most common of the above genus. G. cartilagineum is es- 
pecially common and abundant on the coast of False Bay, and lines 
the vertical faces of the rocks at Kalk Bay at or near the low water level 
in low spring tides. We have found it fertile early in June. G. pristioides 
is often epiphytic on EcTclonia stipes. Both are exposed only at low tides. 
10. Suhria vittata, (L.) J. Ag. 
On stem of Ecldonia buccinalis, Table Bay. (Also Robben Island, 
Muizenberg, Cape Point, Sea Point, Gordon’s Bay, Kalk Bay, 
Camp’s Bay, and Cape Agulhas. Barton.) 
Note on the genus Suhria. 
S. reptans, Grun. is recorded for the Cape, but Grunow thinks it 
may be simply a dwarf or young form of S. pristioides. S. vittata ac- 
cording to a note on one of Tyson’s specimens is the alga alluded to in 
the Swiss Family Robinson as made into a jelly by Cape Colonists who 
call it “chinchow.” We have not met with this custom here. 
12. Ptilophora spissa, (Suhr.) Kiitz. 
Kei mouth. One specimen. 
(b) Gioartinales. 
7. Gigartinaceae. 
3. Irideae capense, J. Ag. 
Pools and rock ledges, Table Bay. (Also Seal Island, Simon’s Bay. 
Barton (l); also Camp’s Bay. Delf.) 
I. elongata, Suhr. 
Pools and rock ledges, Table Bay to Walfisch Bay. This species 
is not mentioned by Barton. 
Note on the genus Irideae. 
We have only found these plants exposed at low tide level in spring 
tides. The fronds in the Tyson collection are either sterile or tetrasporic 
forms. We have found carposporic fronds of I. capense in deep pools 
at low water, Camp’s Bay, Nov. 1920. 
Miss Barton mentions several other species as belonging to the Cape : 
