Ulva lactuca L.

\
G.	K. Tseng: On Marine Algae New to China,
Bull. Fan Mem. Inst. Biol. 7: 174. D. 1936
|\~\f	6. Ulva fasciata Dolile
FI. Aeg. (1813) p. 153. pi- 58, fig. 5; J. Agatdh, Till Alg. syst. VI (1883) p. 174;
Vickers, Phyc. Barbad. (1008) pi. 2; Bcergesen, Mar. Alg. 1). W. I. pt. 1, Cblorophyc.
(1913) p. S; Yamada, Notes Jap. Alg. VI (1035) P- 27.
The thalius is elongated and divided into lobes. Younger speci-
mens collected in December are about 10-12 cm. high and are irre-
gularly dichotomously branched in a flabellate manner. Specimens
collected in April are very much longer, reaching a height of 60 cm.
At the basal part, the thallus is broader, gradually attenuating upwards
and once or twice dichotomously branched. I he color is of a dark
green. In transverse section, the cells appear elongated vertically.
Cell walls are very thick. The thallus is about 70-80^ thick.
HAB. On rocks and in rock pools in the litoral region, Shek-O,
Hong Kong, in December (Tseng 252)\ Stanley, Hong Kong, in April
(Tseng 262\, and Hai-mun, Swatow, in April (Tseng 580).
DISTR. Red Sea; West Indies; Japan. Widely distributed in
warmer waters.
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