376 
PACIFIC SCIENCE, Vol. VIII, October, 1954 
Colonial No. 1, which follows the shore for 
several kilometers north of Km. 15. Here the 
reef is extensive at low tide, and although the 
number of species of algae is rather small, 
several are known to occur intertidally only 
at this locality: Boergesenla forhesii, Acrocystis 
nana, Udotea javensis. Sargassum is abundant 
on outer rocks. Anadyomene and Dictyosphaeria 
are common, and Valonia aegagropila is a 
dominant rock cover along with Gelidium 
pusillum. Avrainvillea occurs in sandy pools 
inshore on the reef. Hildenbrandia is conspicu- 
ous among the stones near high-water mark. 
Mangrove 
The most readily accessible locality for col- 
lecting the algae associated with mangroves 
is along Route Colonial No. 1 where it crosses 
the mangrove swamp just south of the town 
of Ninh Hoa. Here the bay edge of the man- 
groves is only 150 meters to the east. Such 
characteristic plants as Catenella and Caloglossa 
are found, along with several others, on roots 
and mud. Halophila beccarii occurs on exposed 
mud. 
INTERTIDAL STATION LIST 
1. Coral cove just north of the laboratory 
and below the villas. 
2. Cau Da harbor area on either side of the 
wharf. 
3. Cua Be, rocky shore about 1 km. south 
of Cau Da. 
4. Sand flats of Cua Be (including scattered 
rocks) near village of Truong Dong. 
5. Mud flats adjoining Truong Dong. 
6. Sea wall and adjoining small area of shore 
rocks, near Rue de la Poste, Nha Trang. 
7. Coral lagoon on north side of island 
known as Hon Mieu, off Cau Da. 
8. Low ryolite rock known as Roches Noires, 
off north end of lie de Tre. 
9. Rocks at base of cliffs below Bao Dai 
palace (director’s villa). 
10. Shore just east of Cu Lao. 
11. Rocky shore of Binh Cang Bay along 
Route Colonial No. 1, opposite Hon Cii 
Lao. 
12. Mangrove area, inner Binh Cang Bay, 
just east of Route Colonial No. 1. 
13. Southernmost point of island known as 
Hon Mieu, off Cau Da. 
FLOWERING PLANTS 
Key to the Species of Phanerogams 
1. Leaves petiolate, the blades -f — oval. .2 
Leaves not petiolate, ligulate to linear . , 3 
2. Leaves without secondary pinnate veins . 
Halophila beccarii 
Leaves with 11-14 secondary pinnate veins 
Halophila ovalis 
3. Leaves linear, about 1 mm. wide 
Diplanthera uninervis 
Leaves coarse, ligulate, 0.5-1. 2 cm. wide. . 
Thalassia hemprichii 
Halophila beccarii Ascherson 1871: 302 
(Borneo) 
LOCAL DISTRIBUTION: Growing in mud ad- 
joining mangroves, Sta. 12 (11397). 
Halophila ovalis (R. Br.) J. D. Hooker 
I860: 45; Ostenfeld 1909: 68. Caulinia 
ovalis R. Brown 1810: 339 (tropical Aus- 
LOCAL DISTRIBUTION: On sand flats with 
Diplanthera and Thalassia^ Sta. 4 (11165, 
11417); in sand at 5-7 m. off north end of 
lie de Tre (11283); on mud, Sta. 5 (11193). 
These several collections show a relatively 
small number of veins for this species, 12-14 
in the larger sand-flat examples, and 11-13 
in the smaller mud-flat examples, but none of 
them have as few as 7 veins such as are found 
in the closely related H. ovata Gaud. 
Diplanthera uninervis (Forsk.) Ascherson 
1897: 37; Camus 1942: 1215, figs. 116, 1-5. 
Zostera uninervis Forskal 1775: 159 (Red 
Sea) 
