66 
PACIFIC SCIENCE, Vol. XXII, January 1968 
Oahu, Oct 7, 1953. The cystocarps are imma- 
ture. 
additional collections: Da. 19539, reef 
north of Sand I., Palmyra Atoll, Line Islands, 
Oct. 18, 1958; G. 524.1, sterile, as a delicate 
thin fuzz over a dead coral branch in the lagoon 
at a depth of about 28 m, Eniwetok Atoll, Mar- 
shall Islands, Aug. 30, 1955 (the trichoblasts 
subtending the branches unbranched in these 
specimens); G. 592.1, sterile, from a depth 
of 8 fa in the lagoon at Eniwetok Atoll, of 
the Marshall Islands, Sept. 2, 1955. 
This variety is characterized by its small and 
delicate nature and by the distantly placed lateral 
branches. Lopi is the Hawaiian word for thread. 
Polysiphonia hancockii Dawson ( 1 944 : 3 3 1 ) 
Figs. 2D, 2 E, 13, 14 
Epiphytic algae to 1.5 cm high with main 
axes to 900p in diameter, attached basally by 
numerous rhizoids; median parts of main axes 
5 00-60 Op in diameter, with segments 
diameters long; pericentral cells 4, sparsely to 
completely but thinly corticated at the base of 
main axes and often slightly corticated in the 
major laterals; main axes mostly prominent, 
with somewhat distichous laterals of limited 
growth, but branching sometimes deliquescent 
(Fig. 2D) ; trichoblasts one per segment in J 
spiral sequence, mostly short, with 2-3 dichot- 
omies, but occasionally to 700p long with 5-6 
dichotomies, soon deciduous; scar-cells incon- 
spicuous; branches arising independent of tricho- 
blasts mostly at intervals of 6 segments ; 
tetrasporangia to 70p in diameter, spirally ar- 
ranged and protuberant, in repeatedly pseudo- 
dichotomous laterals ; cystocarps globular to 
slightly urceolate, 2 8 0-400 p in diameter, with 
prominently enlarged cells of the ostiolar rim; 
spermatangial stichidia lanceolate, to 200p X 
45p, without a sterile tip, arising as a primary 
branch of a trichoblast. 
type locality: San Jose del Cabo, Lower 
California, Mexico. 
COLLECTIONS identified (all from the Ha- 
waiian Islands) : D. 17400, spermatangial, Laie 
Pt., Oahu, Mar. 17, 1959; D. 19853C, tetra- 
sporic, cystocarpic, spermatangial, near low tide 
level on rocks near the mouth of Halawa stream, 
Molokai, in water fresh to taste, Dec. 26, 1953; 
D. 20047.2, on wave-battered volcanic rock, 
Laie Pt., Oahu, legit R. Tsuda, R. Buggeln, 
and Gavino Trono, May 5, 1963; D. 22400, 
tetrasporic, D. 22401.1, tetrasporic, and D. 
22410.1, tetrasporic, in intertidal algal turf, 
Papawai Pt., southwest of Maalaea Bay, Maui, 
legit H., T., and B., Apr. 19, 1965; D. 
171 84 AC, D. 22534, cystocarpic, in algal turf, 
near Honokohau, Maui, legit H., T., and B., 
Apr. 20, 1965; D. 171 97 All, Kalapana Beach, 
Kaimua Bay, Island of Hawaii, Feb. 27, 1953; 
D. 17333.1 on Corallina sp. J mile southwest 
of Opihikao, Puna, Island of Hawaii, Jan. 27, 
1953; also a collection by C. M. Cook, Jr., cysto- 
carpic, on Gelidium sp., Island of Hawaii, June 
21, 1935. 
Polysiphonia hawaiiensis sp. nov. 
P. ferulacea Menez (1964:209) ; P. ferulacea 
Segi ( ? ) (1951:209); non P. ferulacea 
Suhringar ex J. G. Agardh (1863:980) 
Figs. 2 F, 16, 41 
Plants dull reddish brown, chiefly epiphytic, 
densely tufted, rigid 4. 5-5.0 cm high from a 
limited prostrate base, attached by frequent 
unicellular rhizoids cut off by a cross-wall from 
the proximal end of the pericentral cells, oc- 
casionally with a discoid base composed of a 
tuft of rhizoids ; rhizoids commonly with digitate 
tips; main erect axes mostly 300-5 OOp in diam- 
eter, composed of 4 ecorticate pericentral cells 
and of segments mostly 0. 5-1.0 diameter long, 
with the cells not tumid but having mostly 
straight outer walls; branches replacing tricho- 
blasts, at first strongly curved toward the parent 
branch, but later oriented at a wide angle some- 
what less than a right angle, little or not at all 
narrowed at the base ; trichoblasts one per 
segment in ^ spiral sequence, mostly short and 
soon deciduous but sometimes well developed to 
50 Op long with about 4 dichotomies, with 
apices not much tapered, 8-1 Op in diameter at 
the tips, up to 40p at the base, and with the 
short basal cell 1-1.5 diameters long; scar-cells 
small; mature tetrasporangia 60-90p in diam- 
eter, prominently spiralling in the ultimate 
branches which are not much distended; cysto- 
carps globular, mostly 300-400p in diameter, 
with cells of the ostiolar rim not much enlarged, 
spermatangial branches oblong-ovoid, arising 
