Polysiphonia in Hawaii — Menez 
215 
collected from muddy shore of Round Pond at 
Ewa end of Ala Moana Park, Oahu, December 
11, 1955; 17161 (bish, duh) , on the new 1950 
flow material at Hookena, Hawaii, January 29, 
1953; 17213 (duh), American Legion Post, 
Banyan Park, Hilo, Hawaii, February 2, 1953; 
E. Menez — 701 (bish, duh, m), collected from 
a sandy-muddy place, on limestone rocks in 
about 2-4 inches of water continuously flowing 
at a slow rate, Maunalua Beach area, Oahu, 
January 29, 1961; 702 (BISH, DUH, m), col- 
lected on limestone rocks in about 5-10 inches 
of water, in a small pool with standing water 
which is muddy with a little sand, Maunalua 
Beach area, Oahu, January 29, 1961; 703 (BISH, 
DUH, M ) , collected on limestone rocks near the 
edge of the sandy-muddy shoreline with debris 
and a few dead animal corals, Maunalua Beach, 
Oahu, January 29, 1961; 704 (DUH), collected 
on basalt rocks just below the wall of a pond 
with turbid water and muddy bottom, Kuapa 
Pond, in the vicinity of Koko Head, Oahu, 
January 29, 1961; 705 (bish, duh, m), habitat 
same as 703, Maunalua Beach, Oahu, February 
5, 1961; 712 (bish, duh, m), on cement blocks 
in intertidal level above high-tide line, Sans 
Souci Beach, Waikiki, Oahu, February 2, 1961; 
713 (bish, duh, m), epiphytic on Acantho- 
phora spicifera (mixed with P. ferulacea), col- 
lected on a reef flat at Waikiki, Oahu, February 
24, 1961; 725 (bish, duh, m), collected on 
concrete block and found growing with other 
algae near the bridge facing Diamond Head 
side of Ala Moana Park, Oahu, May 13, 1961; 
730 (BISH, DUH, M), algae in thin tufts on 
limestone rocks covered with mud on banks of 
Floating Dry Dock area, West Loch of Pearl 
Harbor, Oahu, May 21, 1961; 731 (bish, duh, 
m), on limestone rocks covered by barnacles 
and mud, about 500 yards away from collecting 
area at 730, Pearl Harbor, Oahu, May 21, 1961; 
732 (bish, duh, m), on mud-covered oysters, 
wooden poles, and galvanized iron in a tilapia 
and mullet fishpond at Kahua Ranch area, Ewa, 
Oahu, May 21, 1961; 739 (bish, duh, m), on 
top of a concrete block about 1 ft above high- 
tide line under the bridge at Ala Moana Park, 
Oahu, May 5, 1961; 740 (BISH, DUH, M), epi- 
phytic on Acanthophora spicifera on limestone 
rocks, on a sandy flat near the Old Sugar Mill 
area, Kamehameha Highway, near Kaaawa, 
Oahu, July 7, 1961; 758 (bish, duh, m), from a 
muddy area at Keehi Lagoon, Oahu, February 
27, 1961; /. Rock — two collections (bish) with 
no numbers, one collected from Sand Island, 
Oahu, June 1, 1908, and another collected from 
Honolulu waterfront, Oahu, May 30, 1908. 
Polysiphonia pulvinata (Roth) J. Agardh, Alg. 
Maris Medit. et Adriat. 124, 1842 
Figure 4, A-D 
TYPE: Type specimen presumed to be in the 
Agardhian herbarium, University of Lund. 
obligate synonym: Conferva pulvinata 
Roth, Catal. Bot. 1:187, 1797. 
FACULTATIVE SYNONYMS: Hutchinsia pulvi- 
nata C. Agardh, Syst. Alg.: 148, 1824. Hutchinsia 
haiia C. Agardh, Syst. Alg.: 155, 1824. 
Thalli tufted, with decumbent branches, up 
to 1 cm in height. Pericentral cells four, ecorti- 
cate. Base composed of rhizoids cut off from 
the proximal ends of the pericentral cells by a 
cross-wall. Diameter of rhizoids up to 25 \x with 
a length of about 625 /x. Terminal ends simple 
or ramified, sometimes attached to other fila- 
ments or branches, occurring singly, occasionally 
two or three in each segment. Vegetative axes 
78-130 fx in diameter near the apices and up 
to 210 ix in the base. Segments approximately 
as long as broad. Principal axes dichotomous, 
angles of dichotomy not more than 45 degrees. 
Ultimate branchlets of tetrasporangial plants 
torulose, attenuated or narrowed towards the 
base. Cicatrigenous branches common, especially 
on the basal portions. Trichoblasts numerous at 
the apices, incurved in immature stages, 500 /x 
in length and 55 /x in diameter with rounded 
tips, forked 1-3 times, and arranged spirally in 
l A divergence, deciduous. Basal cell shorter than 
the rest of the segments. Scar cells one in every 
segment, arising in a right-hand spiral, with !4 
divergence. 
Tetrasporangia 35-55 /x in diameter, tetra- 
hedral, globose, produced one in each segment 
of the axes near the apex, arising 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. 
