436 
Plants densely matted, coarse; tetraspor- 
angial sori unilateral, saddle-shaped 
H. nidulans 
Hypnea cornuta Lamouroux, ex J. Agardh 
1852: 449 (Tropical Atlantic America); Ta- 
naka 1941: 242, fig. 14A-E 
Fig. 46c 
LOCAL distribution: Sta. 4 (11189, 11428); 
drift, Sta. 3 (11092). 
Fig. 47. Hypnea valentiae: Habit, X 1.35. 
PACIFIC SCIENCE, VoL VIII, October, 1954 
This is the Chondrocloniutn cornutum Lamx. 
listed by von Martens (1866) from the south 
China Sea. 
Hypnea boergesenii Tanaka 1941: 233, pi. 
53, fig. 1, text figs. 6-8 (Formosa) 
Fig. A6k 
LOCAL DISTRIBUTION: In drift, Sta. 10 
(11336). 
These specimens agree well with this spe- 
cies, except that the percurrent axes are not 
so prominent, and the tips show some divari- 
cateness of the ultimate branchlets. The plants 
are about the same size as the type and show 
the exceedingly dense development of short 
lateral branchlets over the entire thallus. 
Hypnea valentiae (Turn.) Montagne 1840^: 
161; B0rgesen 1934: 17. Fucus valentiae 
Turner 1809, ph 78 (Red Sea). Hypnea char- 
o/Vo Lamouroux 1813: 44, pi. 10, figs. 1-3; 
Kiitzing, Tab. Phyc. 18, pi. 22 
Figs. 46/, 47 
LOCAL DISTRIBUTION: In drift, Sta. 3 
(11092a); abundant, Sta. 4 (11429). 
This species is characterized by the long, 
slender, lateral ramuli. My material is net 
fertile, but it agrees with the figures cited 
above. B0rgesen (1937) follows Hauck (1887) 
in considering H. charoides a variant under 
H. valentiae, 
Hypnea esperi Bory 1829: 157 (type locality 
uncertain); B0rgesen 1920: 306, fig. 48; 
Kiitzing, Tab. Phyc. 18, pi. 26a-c; Dawson 
1944: 292 ; Tanaka 1941 : 243, fig. 15a-d 
Fig. 46/?-/ 
LOCAL DISTRIBUTION: Growing in small, 
loose tufts to 3 cm. high on sandy mud flats 
adjoining Sta. 12 (11402); forming a loose 
turf 1.0-1. 5 cm. high, lightly attached to 
gravel, Sta. 10 (11349). 
The small size and slender branches dis- 
tinguish this species among the Nha Trang 
hypneas. 
