Marine Aigae from Central Pacific — Tsuda and Trono 
195 
reef on west side, July 23, 1964; crl 2324.1, 
in crevices at NE point, Oct. 9, 1964; crl 
2333.1, in beachdrift on NW point of island, 
Oct. 10, 1964; crl 2342.1, in beachdrift on SE 
shore, Oct. 10, 1964; crl 2351.2, in beachdrift 
on SW beach, Oct. 11, 1964; crl 2362.1, on 
exposed reef at low tide on south side near 
beach rock shelf (collected by C. R. Long and 
P. Woodward), Oct. 12, 1964. 
Dictyosphaeria versluysii Weber van Bosse, 
1905:155; Egerod, 1952:351, figs, la and 
2h—k. 
BAKER ISLAND: crl 2397.1, in tidepool on 
SE reef, Oct. 14, 1964. 
Cladophoropsis gracillima Dawson, 1950:149, 
figs. 12-13. 
BAKER island: crl 2397.2, in tidepool on 
SE reef, Oct. 14, 1964. 
HOWLAND island: crl 2333.1, in beach- 
drift on NW point, Oct. 10, 1964; crl 2351.3, 
in beachdrift on SW beach, Oct. 11, 1964. 
The filaments are clumped together, appear- 
ing as felt-like cushions. The erect filaments, 
about 110-l40p wide, attain a height of 2 cm, 
with the branches, if present, occurring only at 
the terminal portion. The walls are distinctly 
striated longitudinally. 
Caulerpa serrulata var. typica f. serrulata 
(Weber van Bosse) Gilbert, 1942:15; 
Eubank, 1946:418. 
HOWLAND island: crl 2189, in crevices on 
exposed reef, July 23, 1964. The marginal ser- 
rations are at regular intervals throughout the 
untwisted fronds. 
Halimeda spp. 
Ten specimens were sent to Dr. L. H. Colin- 
vaux, Department of Botany and Plant Pathol- 
ogy, Ohio State University, for a more critical 
study. 
PHAEOPHYTA 
Ectocarp/is indicus Sender in Zollinger, 1854: 
3; B0rg., 1941:16, figs. 6-7. 
baker island: crl 2380, intermixed with 
silt in pools on NE beach covered by high tide, 
Oct. 14, 1964; crl 2382.3, epiphytic on Turbi- 
naria ornata (Turner) J. A g. in pools on NE 
beach exposed at low tide, Oct. 14, 1964. 
Sphacelaria sp. 
BAKER ISLAND: crl 2369.4, in beachdrift on 
SW beach opposite wrecked landing craft, Oct. 
14, 1964. A fragmentary specimen lacking prop- 
agulae is the only representative of this genus 
in the collection. 
Dictyota friabilis Setchell, 1926:91, pi. 13 (figs. 
4-7), pi. 20 (fig. 1). 
HOWLAND ISLAND: CRL 2324.3, in water- 
filled crevices on reef at NE point, Oct. 9, 1964. 
Turb inaria ornata (Turner) J. A g., 1848:266; 
Taylor, 1964:483. 
BAKER ISLAND: crl 2167, in beachdrift on 
south reef, July 21, 1964; CRL 2382.1, in pools 
on NE beach exposed at low tide, Oct. 14, 
1964; crl 2383.4 and crl 2383.5, in drift in 
pools on NE point, Oct. 14, 1964. Specimens 
crl 2167 and crl 2383.5 are very similar to 
Taylor’s circumscription of T. ornata var. ornata 
f. ecoronata Taylor, characterized by its promi- 
nent vesicle and lack of secondary rows of teeth. 
Specimens crl 2382.1 and crl 2383.4 are 
somewhat atypical forms in which the leaves 
possess only an occasional secondary tooth near 
the margin. 
RHODOPHYTA 
Gelidiopsis sp. 
HOWLAND ISLAND: crl 2324.3, in crevices on 
reef at NE point, Oct. 9, 1964; crl 2342.2, in 
beachdrift on SE shore, Oct. 10, 1964; crl 
2333.1, in beachdrift on NW point of island, 
Oct. 10, 1964. The stoloniferous branches are 
attached to the substratum or to each other by 
means of short haptera-like attachment organs, 
giving rise to erect branches which may be sim- 
ple or moderately branched. In cross section the 
cylindrical branches possess medullary cells up 
to lip in diameter, decreasing in size toward 
the periphery. The cortical cells are slightly 
elongated and radially arranged. The stichidia 
are intercalary, about 0.5 mm from the tip of 
the branch, and appear lanceolate in shape. 
Jania cap iliac ea Harvey, 1853:84 (Florida); 
Dawson, 1954:432, figs. 41 a-b. 
BAKER island: crl 2369.2, in beachdrift on 
SW beach opposite wrecked landing craft, Oct. 
13, 1964; CRL 2385.2, in shallow pool on NE 
