Polysiphonia of the Tropical Pacific, I — Hollenberg 
67 
as a primary branch of a trichoblast, 200-2 5 Op 
X 80-100]i with a relatively inconspicuous 
sterile tip consisting mostly of one small cell 
with a relatively thin wall. 
Plantae praedpue epiphyticae, conferte fruticu- 
losae, ad 5 cm ait., e basi prostrata praefinita, per 
rhizoidea unicellularia, ut cellulas discretas separata, 
affixa; axes principales erecti 300-400 |a diam. ; cellulae 
pericentrales 4, ecorticatae ; segmenta partibus in mediis 
ramorum erectorum 0.5-1 .0 plo breviora quam lata; 
rami pro trichoblastis substitute postremo late diver- 
gentes; sine axibus percurrentibus ; trichoblastae una 
in unoquoque segmento, in J spira, plerumque breves 
et mox deciduae; tetrasporangia in ramis ultimis 
spiraliter ordinata; cystocarpi giobosi; 300— 400 li 
diam.; rami spermatangiales oblongo-ovoidei, cacumen 
parvum unlcellulare sterile, ut ramum trichoblastae 
primarium enascens, habentes. 
type: D 18764, tetrasporic, cystocarpic, 
spermatangial, epiphytic on a species of Sar gas- 
sum from shallow water, Sans Souci Beach 
Laboratory, Waikiki Beach, Oahu, Hawaiian 
Islands, legit G. J. Hollenberg, Jan. 21, 1963- 
The species is very abundant at this locality. 
ADDITIONAL COLLECTIONS : HAWAIIAN IS- 
LANDS — D. 8755, spermatangial on Sargassum 
sp., D. 8756, spermatangial, Ala Moana Park, 
Honolulu, Oahu, Mar. 19, 1951; D. 10999, 
cystocarpic, spermatangial, awash, Laie, Oahu, 
Jan. 17, 1954; D. 17373, cystocarpic, near 
Natatorium, Waikiki Beach, Oahu, Nov. 20, 
1955; H. 62-11, spermatangial, on other algae, 
cast ashore, Sans ’ Souci Beach Laboratory, 
Waikiki Beach, Oahu, Dec. 12, 1962 ; H. 65—14, 
spermatangial, dredged 2-3 fa, Kaneohe Bay, 
Oahu, Mar. 20, 1965; an unnumbered collection 
by Isabella Abbott, on Laurencia sp., Makahoa 
Pt, Oahu, Mar. 17, 1941; M. 71 3B, tetrasporic, 
on Acanthophora sp., on reef flat, Waikiki 
Beach, Oahu, Feb. 24, 1961; D. 13005, outer 
side of breakwater, Maalaea, Maui, Aug. 27, 
1955; D. 19067.1, cystocarpic, spermatangial, 
Kaanapali Landing, Maui, Mar. 22, 1959; D. 
19079, spermatangial, near St. Theresa Church, 
Kill ei, Maui, Mar. 22, 1959; D. 22348, tetra- 
sporic, spermatangial, on other algae, intertidal 
basalt, east of Maalaea, Maui, legit LL, T., and 
B., Apr. 19, 1965 ; D. 22367, tetrasporic, cysto- 
carpic, spermatangial, Maalaea, Maui, IL, T., 
and B., Apr. 19, 1965; D 22473, tetrasporic, 
spermatangial on reef flats north of Honokowai, 
Maui, legit H., T., and B , Apr. 20, 1965; 
D. 22525.1, spermatangial, on Sargassum sp., 
in shallow water, northern Maui, legit H., T., 
and B., Apr. 20, 1965; society islands — D. 
12114.6, Arne Pt, Arne District, Tahitia, Sept. 
15, 1952; Philippine islands — Certain speci- 
mens mostly considerably smaller than the 
Hawaiian specimens have been identified with 
some misgivings as P. hawaiiensis : a collection 
by D. P. Abbott, on and among tufted algae, 
Gnat Reef, Balabac L, Sulu Sea, Mar. 2, 1957, 
seems close to P. sparsa in size and length of 
segments; an epiphyte collected by D. P. Abbott, 
Tijitiji reef, Tawitawi, Sulu Sea, Feb. 15, 1957. 
Also referred to this species with some hesita- 
tion are the following: D, 14697, tetrasporic, on 
Sargassum sp. Labrador, Tandjang, Berlayar, 
Singapore, Jan. 25, 1965 ; W. H. Harvey, Alg. 
Ceylon No. 12, cystocarpic, spermatangial (as 
P. binneyi Harv.) on other algae, Rijksherbar- 
ium (Herb. Lugd. Bat No. 941, 182-83). 
These two plants are smaller and more slender 
than the Hawaiian specimens and the tricho- 
blasts are poorly developed. 
A specimen identified as P. ferulacea f. im- 
plicata Tseng (1944:76) may prove to be a 
variation of P. hawaiiensis. Tseng does not 
indicate the height of his plant and efforts to 
obtain a loan of his Hong Kong specimens have 
met with no success. 
Numerous herbarium specimens of this taxon, 
mostly from Oahu, are to be found in the 
Bishop Museum, Honolulu. Many of these have 
been annotated by E. G. Menez (1964) as P. 
ferulacea . 
This alga has been commonly identified as 
P. ferulacea J. G. Agardh, which it resembles 
in a number of respects. From that species it 
differs chiefly in the widely divaricate branching, 
with percurrent axes, when present, lost in the 
terminal parts. Taylor (i960) describes the 
branching of P. ferulacea as "subfastigiate to 
virgate above.” In a communication from Dr. 
Sven Snogerup, Keeper of the Botanical Museum 
at Lund, Sweden, he mentions mounted speci- 
mens of P. ferulacea on sheets signed by J. G. 
Agardh. Two specimens, 40176 and 40181, 
are from "Vera Cruz, Liebmann,” and in addi- 
tion there are two specimens, 40178 and 40179 
"from Guadaloupe, coll. Duchchassamg” ac- 
companied by a mica preparation, 40180, 
"apparently from a cut-off part of one of them.” 
