196 
PACIFIC SCIENCE, Vol. XXII, April 1968 
beach, Oct. 14, 1964; crl 2397.3, in tidepool 
on SE reef, Oct. 14, 1964. 
howland island: crl 2324.13, in crevices 
on reef at NE point, Oct. 9, 1964; crl 2333.2, 
in beachdrift on NW point of island, Oct. 10, 
1964. 
All specimens form small clumps about 1 cm 
high and always are found in association with 
other algae. The intergenicula are cylindrical, 
rather coarse, approximately 100-1 15 jji thick, 
and about 5-8 diameters long. Branching is 
dichotomous to irregularly decussate and wide- 
angled, about 60°-90°. All specimens examined 
were sterile. 
Jania micrarthrodia Lamx., 1816:271; Dawson, 
1956:49, fig. 2. 
howland island: crl 2324.2, in crevices 
on reef at NE point, Oct. 9, 1964; crl 2333.2, 
in beachdrift on NW point of island, Oct. 10, 
1964; crl 2351.2, in beachdrift on SW beach, 
Oct. 11, 1964. 
This alga forms hemispherical cushions to 
about 2.5 cm tall and 4 cm broad. It is often 
found in association with other algae. The erect 
branches are compact, basically dichotomous 
and decussate, but sometimes trichotomous or 
having several branches present on only one 
side of the main axis. Although basically dichot- 
omous, the unequal spread of the branches gives 
the impression of a percurrent main axis. The 
conceptacles are antenniferous, with the anten- 
nae giving rise to branches which may bear 
other conceptacles. 
Hypnea sp. 
baker island: crl 2369.1, in beachdrift on 
SW beach opposite wrecked landing craft, Oct. 
13, 1964. The only representative of this genus 
in the collection is a fragmentary specimen less 
than 1 cm in length. It is irregularly branched, 
with no distinct main axis present. 
Lomentaria sp. 
baker island: crl 2378, in sandy pool on 
NE reef, Oct. 14, 1964. A single specimen 
about 3 mm high with a slightly flattened thal- 
lus and irregular branching pattern was found 
in the collection. Five to six layers of small 
cortical cells about 6p in diameter, with larger 
medullary cells about 3 Op in diameter, were seen 
in cross sections. 
Ceramium gracillimum var. byssoideum (Harv.) 
G. Mazoyer, 1938:323; Dawson, 1954: 
448, figs. 55 e-f. 
BAKER island: crl 2378.2, in sandy pool on 
NE reef, Oct. 14, 1964. The specimens are 
characterized by the division of the nodal corti- 
cations at the lower third by a clear line, with 
the upper two thirds made up of angular cells 
cutting off smaller superficial cells, and the 
lower third made up of 1-2 tiers of horizontal 
cells; and also by the presence of whorls of 
spermatia found at the nodal cortication. How- 
ever, our specimens possess whorls of long thin 
hairs originating from the upper portion of the 
nodal cortications. All specimens are antherid- 
ial. 
Ceramium spp. 
baker island: crl 2381.3, in drift in tide- 
pool on north beach, Oct. 14, 1964. 
howland island: crl 2333.2, in beachdrift 
on NW point of island, Oct. 10, 1964; crl 
2362.2, on exposed reef at low tide on south 
side near beach rock shelf (collected by C. R. 
Long and P. Woodward), Oct. 12, 1964. 
Laurencia nana Howe, 1920:566; Dawson, 
1957:124, fig. 30. 
baker island: crl 2385.1, in shallow pool 
on NE beach, Oct. 14, 1964; crl 2403.2, on 
reef on NE side of island (collected by C. D. 
Hackman), Oct. 15, 1964. 
howland island: crl 2324.3, in crevices 
on reef at NE point, Oct. 9, 1964. 
The thalli, 2-3 cm high, anastomose in 
clumps due to the presence of rhizoidal haptera. 
In cross section the surface cells are radially 
elongated and arranged in a palisade. Our speci- 
mens (about 0.85 mm in width) are twice as 
wide as Howe’s specimen (0.45 mm wide). 
REFERENCES 
Agardh, J. G. 1848. Species genera et ordines 
algarum .... Vol. 1. C. Gleerup, Lund, 
viii -f- 363 pp. 
Bliding, C. 1948. Enter omorpha kylinii , eine 
neue Art aus der schwedischen Westkiiste. K. 
Fysiogr. Sallsk. Lund, Forh. 18(14) :l-6. 
— 1963. A critical survey of European 
taxa in U1 vales. Opera Botanica 8(3) :1-160. 
