Marine Chlo.top.byta of Hawaii, II- Gilbert 
Doty 1 9255, TYPUS, super fossam lavae prae- 
historicam 6-8 metra super arenam atque aquae 
altitudinem aestu alto, ca. 17 metra versus orb 
entem fluminis lavae 1955 Keekee in loco Puna, 
Hawaii dicto, m. Dec. 23, 1959 lectus. 
Plant small and siphonous, green, forming 
felted cushions on sand in shaded crevices of 
lava dikes 20-30 ft above high tide line; lower 
(covered) filaments somewhat lax, (usually) 
dichotomously branched with no constrictions 
at branch bases, and with fewer chloroplasts 
than in upper part of plant, diameter variable, 
from 11- 60 fx and with walls of variable thick- 
ness and often striated; some of lower branches 
descending, becoming quite slender, almost col- 
orless, and rhizoidal in appearance, but rhizoidal 
branches may, and often do, occur at almost any 
part of the plant; upper filaments more uniform 
in diameter, 16-25 (30) g, crowded with small 
round to oval chloroplasts that are apparently 
without pyrenoids, branching di- trichotomous 
to distinctly lateral with constrictions evident 
at branch bases; secondary constrictions be- 
tween branches infrequent to absent. 
COLLECTIONS: Doty 19255 , TYPE, on top of 
prehistoric lava dike, 6-8 meters above the sand 
and high tide line, about 50 ft E of the 1955 
Keekee lava flow, Puna, Hawaii, Dec. 23, 1959; 
19355, growing in shaded crevices about 20-30 
ft above high tide line about l * A mile E of the 
1955 lava flow in Keekee, Puna, Hawaii, Sept. 
8, I960. 
After a prolonged study I have come to the 
conclusion that the material represents an unde- 
scribed species of Boodleopsis, which itself is a 
rather uncertain genus 3 in the Siphonales. 
Boodleopsis was established by A. and E. S. 
Gepp (1911:64) who named and described 
Boodleopsis siphonacea . Subsequently two spe- 
cies have been added to the genus, B. pusilla 
(Collins) Taylor, Joly, and Bernatowicz (by 
transfer from Dichotomo siphon) and B. ver- 
ticillata Dawson ( 1960:32 ) . The proposed spe- 
cies differs from B. siphonacea and B. pusilla 
In Its smaller size, the fact that it lacks the sec- 
ondary constrictions between the branches of 
its upper filaments, and in that it frequently 
3 See the discussion in Taylor, Joly, and Bernato- 
wicz (1953:103-105). 
491 
branches laterally, sometimes to the exclusion 
of di- or trichotomous branching. B. hawaiien- 
sis differs from B. verticillata in its distinctly 
smaller size and the lack of verticillate branch- 
ing. Attention should also be called to the fact 
that all three of the previously described spe- 
cies are known from a muddy substratum on 
reefs or in estuaries, while B. hawaiiensis was 
found on a sandy substratum in shaded crevices 
of a lava dike 20-30 ft above high tide line. 
27. Codium saccatum Okamura, 1915, p. 145, 
pi. 135, figs. 1-5. 
A single specimen of this species was in- 
cluded in a small assortment of algae collected 
from the wash at Midway Island by Dr. Hubert 
Frings and sent to me by Dr. Doty. This Codium 
is characterized by its thin, tough, membranous 
sac-like form and its very small utricles. It has 
been reported rarely outside of Japan ( Dawson, 
1957: 107). 4 Although Midway Island is not 
included officially within the State of Hawaii, 
geographically it is part of the archipelago and 
hence the basis for including C. saccatum in this 
list. 
COLLECTION: Doty 19699, in wash, Midway 
Island, April, 1962, collected by Dr. Hubert 
Frings. 
REFERENCES 
Agardh, C. A. 1822. Species algarum. Vol. 1, 
Pt. 2, pp. 169-531. Stockholm. 
Agardh, J. 1883. Till algernes systematik, VI. 
Ulvaceae. Lunds Univ. Arsskr., 19, part 4(2 ) : 
1-177, pis. 1-4. 
B0RGESEN, F. 1935. A list of marine algae from 
Bombay. Kgl. Danske Vidensk. Selskab., Biol. 
Meddelelser 12(2): 1-64. 10 pis. 
— 1940. Some marine algae from Mauri- 
tius, I. Chlorophyceae. Kgl. Danske Vidensk. 
Selskab., Biol. Meddelelser 15 (4) : 1-81. 
— 1946. Some marine algae from Mauri- 
tius. An additional list of species to Part I. 
Chlorophyceae. Kgl. Danske Vidensk. Sels- 
kab., Biol. Meddelelser 20(6) : 1-64. 
i In personal correspondence Dr. Paul Silva reports 
that this species has appeared also from Tonga Island, 
in collection No. 13206 of the Capricorn Expedition. 
