198 
PACIFIC SCIENCE, Vol. 1, October, 1947 
Vaucheria De Candolle, 1801: 17 
Plants matted, floating, or on the bottom 
of shallow parts of the ponds. Filaments 
entangled, coenocytic, with spherical oogonia 
or antheridia. These structures are stalked 
or (in ours) sessile. 
Three types of plants are found in the 
ponds, one with no reproductive organs. 
Determination is thus incomplete for this 
specimen. The genus is newly reported from 
the Hawaiian Islands. 
Vaucheria dichotoma (Linn.) C. Agardh, 
Synop. Alg. Scand., 47, 1817. 
Large, free-floating masses, in the sum¬ 
mer with oogonia and antheridia. Oogonia 
sessile, globular; antheridia with a terminal 
opening, sessile, shaped much like oogonia 
but slightly more elongate. 
Kuapa Pond. In abundance. 
Vaucheria Thuretii Woronin, in Bot. Zeit., 
157, 1869. 
Filaments 60-80 /* in diameter, in dense 
patches. Plants monoecious, with sessile 
spherical oogonia; antheridia curving to a 
lateral pore. 
Keawanui Pond. Rare. 
Vaucheria sp. 
A sterile specimen, with measurements 
smaller than the two species just mentioned, 
was found in Molii Pond attached to a mol- 
lusk. 
Cladophora Kiitzing, 1843: 262 
Plants bushy, to 15 cm. in height, with 
prominent lateral branches cut off from the 
main axes. Each cell multinucleate with 
many chloroplasts. 
A most variable genus, with representa¬ 
tives by far the most commonly found in 
brackish water. Identification cannot be 
made with certainty without a large amount 
of comparative material. Lacking this, de¬ 
termination must be left at the genus. 
In all the ponds, but in abundance espe¬ 
cially in the more saline ones. 
Compared with the published illustra¬ 
tions of Brand (1905), these specimens 
show much variation, and relationships can¬ 
not be established without examining the 
specimens used by him. 
Bryopsis Lamouroux, 1809^: 133 
Bryopsis pennata Lamouroux var. secunda 
(Flarvey) Collins and Hervey, Amer. 
Acad. Arts and Sci., Proc. 53: 62, 1917. 
Only one plant, 2 cm. in height, was col¬ 
lected, in the more saline portions of Kea¬ 
wanui Pond. The main branches arise from 
a rhizoidal base, and branch in a pinnate 
manner, the pinnules opposite each other. 
A few branches show the secund type of 
orientation. The plant is dark green. 
Distribution: Florida, Bermuda, Bahamas 
and islands of the West Indies to Aruba 
Island, Netherlands West Indies (for the 
species). 
A rather exhaustive comparison has been made 
of this specimen with other Bryopsis specimens 
from this area, and also from other parts of the 
world, with emphasis on tropical forms. These 
comparisons have been made in the University of 
California Herbarium. 
With certain specimens from Hawaii (Reed 
1173, 1150, 1068 ) our specimen is in good agree¬ 
ment. Close comparison is also possible with 
plants from Samoa and Tahiti (Setchell 1087, 
Tutuila, and $ etch ell and Barks 5185, Tahiti, both 
as B. Harveyana), from Formosa (legit Y. 
Yamada), and to some extent specimens from 
Dwarka (Boergesen 5534 as B . plumosa ), the Gulf 
of California (Turner’s Island, Dawson 688 as 
B. plumosa var. pennata ), and from New Guinea 
(Kdruhach 29, det. Grunow, as B, Harveyana). 
Specimens on sheets 341389, 341498, and 341390 
which have been determined as B. Harveyana by 
Setchell show little agreement with our specimens. 
These plants are from the Malay Peninsula. Like¬ 
wise little similarity can be detected between the 
Hawaiian specimens and those of the Atlantic 
determined as B. plumosa (exemplified by Setchell 
150 from Woods Hole), or of the Caribbean 
forms of this species. 
The North American specimens seem to be 
Boergesen’s variety typica of B. plumosa. Boerge- 
sen’s varieties pennata, Harveyana, and Leprieurii 
of B. plumosa (1911: 147; 1913: 115) show more 
