Polysiphonia in Hawaii — Menez 
213 
segment, twice forked, 5-10 /x in diameter and 
up to 450 /x long. Basal cells shorter than the 
rest of the cells above it. Scar cells rare and 
irregularly disposed. 
Tetrasporangia not found in the materials at 
hand. 
Antheridia not found in the materials at hand. 
Cystocarps not found in the materials at hand. 
MATERIALS examined: E. Menez— 710 
(bish, DUH, m), collected in about 3-4.5 ft 
water from the bank of Waipuhi Stream above 
Kamehameha Highway (towards the open sea 
on the sea side of the bridge coming from Ka- 
neohe), Hauula, Oahu, February 24, 1961; 711 
(BISH, DUH, M ) . collected in about 4.5-8 ft 
water from the bank of Waipuhi Stream at the 
mountain side of the bridge at Hauula, Oahu, 
February 24, 1961; 728a (bish, duh, m), on 
cement wall made with basalt rock along Wai- 
puhi Stream inland from Kamehameha High- 
way, near Hauula School, Hauula, Oahu, May 
13, 1961; 728b (BISH, duh, m), on cement 
wall along ocean side of Waipuhi Stream near 
Hauula School, Hauula, Oahu, May 13, 1961. 
Polysiphonia mollis Hooker and Harvey, Ner. 
Austr. 2, 8:43, 1847 
Figure 3, A-G 
TYPE: A collection by R. Gunn labelled 
"original sp.” in the Harvey Herbarium, Trinity 
College, Dublin. Type specimen collected from 
Tasmania, "parasitical on larger algae.” 
FACULTATIVE SYNONYMS: Polysiphonia sny- 
derae Kylin, Calif. Rhodop., Fysiog. Sallskaplts 
Hand. 52(2): 35, 1941. Polysiphonia snyderae 
var. intricata Hollenberg, Amer. Jour. Bot. 29 
(9) : 785, 1942. Polysiphonia senticulosa Snyder, 
in P'hyc. Bor. Amer. 13:638, 1899. Polysiphonia 
eastwoodae Setchell & Gardner, Mar. Alg. Revill. 
Is. Exped. 1925. Calif. Acad. Sci. Proc. Ser. 4, 
19:161, 1930. Polysiphonia aquamara Abbott, 
Brackish-water algae from Hawaiian Islands. 
Pacif. Sci. 1(4): 2 12, 1947. 
Thalli tufted, up to 12 cm in height. Peri- 
central cells four, ecorticate. Base of thalli com- 
posed of numerous slender rhizoids cut off from 
the proximal ends of the pericentral cells by a 
cross-wall, mostly one per segment, with either 
simple or ramified terminal ends, 20-52 u in 
diameter and up to 780 ,u. long. Vegetative axes 
about 50-105 u in diameter near the apices and 
up to 210 /x in the base. Segments 2-4 times as 
long as broad. Principal axes dichotomous, 
angles of dichotomies not more than 45 degrees 
and 3-14 segments apart, with fewer interven- 
ing segments near the apices. Trichoblasts 2 or 
3 times forked, arranged in a right-hand spiral 
on the axis occurring one on each segment, up 
to 130 /x in length, attenuated towards the apex, 
basal cell robust and about 10 /x in diameter and 
much shorter than the rest of the segments 
above it. Scar cells one on each segment, pro- 
duced near the apices, and spiralling to the right 
in a V4 divergence. 
Tetrasporangia 50-115 /x in diameter, tetra- 
hedral, globular, produced near the apices in a 
spiral running in a right-hand direction, when 
the branch is viewed from the point where the 
oldest tetrasporangium is found and following 
then toward the branch tip. 
Antheridial clusters borne as primary branches 
of the trichoblasts at the apex. 
Cystocarps subglobose, stalked, on a segment 
of 2-4 pericentral cells, 250 ;x high and 160- 
200 jx in diameter. 
MATERIALS EXAMINED: 1 . Abbott — 657 
(bish, duh), collected from Ualapue Pond, 
Molokai, August 29, 1944 (labelled P. aqua- 
mara); 1763 (bish), collected from Kupeke 
Pond, Molokai, August 1944 (labelled P. aqua- 
mara); 1767 (BISH), collected from Maupala 
Pond, Molokai, August 25, 1944 (labelled P. 
aquamara); G. Andrews — 49 to 52 and 79, in 
folder "L” (BISH), collected from Oahu; E. 
Bailey — in folders "K” ( BISH ) and "E” ( BISH ) 
without numbers, collected from Oahu, 1876; 
M. Doty — 8817 (bish, duh), on rocks at 0.0 
level in mud on north side of pier of Coconut 
Island Hotel on shore at Kaneohe Bay, Oahu, 
April 22, 1951; 12386 (bish, duh), on pond 
connection with muddy bottom, Coconut Island, 
Kaneohe Bay, Oahu, February 5, 1954; 12389 
(DUH), on pond drain, Coconut Island, Ka- 
neohe Bay, Oahu, February 5, 1954; 12684 
( BISH, duh ) , from a muddy area at Keehi La- 
goon, Oahu, December 30, 1954; 12689 (bish, 
duh ) , Keehi Lagoon, airport side of the largest 
island (and that island formerly called Moka- 
uea) on Diamond Head side of the runways, 
Oahu, December 30, 1954; 13078 (bish, duh), 
