Polysiphonia of the Tropical Pacific, I — Hollenberg 
81 
ment of spermatangial branches (Fig. 6F) is 
a characteristic feature of this variety. 
COLLECTIONS EXAMINED: HAWAIIAN ISLANDS 
— T. 633, on coral reef of Bird I., Pearl and 
Hermes Reef, Aug. 1964; D. 9908 A, tetra- 
sporic, on rocks between stream entrance and 
Papaa Bay, Aliomanu, Kauai, Feb. 3, 1952; 
D. 19633, tetrasporic, on wave- washed basalt 
bench at low tide, south side of Hanauma Bay, 
Oahu, Feb. 3, 1962; H. 65-38, Wawamalu 
Beach, Oahu, legit G. Collins, Feb. 28, 1965 ; 
D. 22289-5, low mats, intertidal, Kahe Pt. 
Beach Park, Oahu, legit R. Tsuda and R. Bug- 
geln, Jan. 3, 1965; D. 18720.1, on 1740 lava 
flow, Maui, Dec. 17, 1955; D. 22401.3, basalt 
shore line, Papawai Pt., northwest of Maalaea, 
Maui, legit H., T., and B., Apr. 19, 1965; D. 
22435, extensive patch on boulders near Camp 
Pecusa, leeward Maui, legit H., T., and B., 
Apr. 19, 1965; D. 22549.1, on Pocockiella, on 
large boulders, Kahakuloa, Maui, legit H., T., 
and B., Apr. 21, 1965; D. 19730A, on coral, 
reef flats, Kumimi, Molokai, Dec. 29, 1953; 
D. 17199A1, with ]ania, etc. near landing, 
Kaimu Bay, Puna, Island of Hawaii, Jan. 27, 
1953; D. 19252, tetrasporic, on wave-dashed 
basalt, Koneleau study area, Puna, Island of 
Hawaii, Dec. 23, 1959; line islands — L. 
2700.6, tetrasporic, on Dictyosphaeria, in algal 
mat, near breaking-wave zone, Jarvis I., Nov. 
16, 1964; L. 2701.6, tetrasporic, L. 2702.3, 
L. 2703.4, and L. 2706.5, tetrasporic, on coral 
heads exposed at low tide, southwest reef, Jarvis 
I., Nov. 16, 1964; L. 2804.6 and L. 2805.2, 
algal mats on rocks exposed at low tide, western 
reef, Christmas L, Nov. 23, 1965 ; Marquesas 
islands — D. 19798 A, tetrasporic, on surf-swept 
rock, Huta Atua Bay, Nuku Hiva I., legit John 
E, Randall, July 16, 1957; tuamotu archi- 
pelago — D. 11160B1, tetrasporic, on dead 
coral, reef near lagoon entrance, Takeke, Raroia 
Atoll, legit M. S. Doty and Jan Newhouse, 
July 9, 1952; D. 11858.6, on dead coral, and 
D. 11859.2 on crustose corallines, near Otetou, 
Raroia Atoll, legit M. S. Doty and Jan New- 
house, Aug. 21, 1952; society islands — D. 
1840 IB, tetrasporic, on reef at Papeete Harbor, 
Tahiti, legit J. Randall, Mar. 12, 1956; phoenix 
islands — L. 2451.4, on Halimeda sp., McKean 
I., Oct. 21, 1964; AMERICAN SAMOA — T. 75 2B, 
on wave- washed basalt shore, Vatia Bay, 
Tutuila I., legit R. Buggeln, Aug. 1964; T. 
897A, on basalt rock near shore, Lion’s Head, 
Tutuila I., legit R. Buggeln, Aug. 7, 1964; 
Mariana islands — D. 20132, tetrasporic, on 
dead coral, Guam, legit E. Menez, Oct. 12, 
I960; new Zealand — A herbarium mount in 
the Allan Hancock collections at the University 
of Southern California is from the Lindauer 
Herbarium and was collected at Long Beach, 
N. Z., and identified as P . macra (Harvey) 
Falkenberg. It agrees very well with other collec- 
tions of P. scopulorum var. scopulorum. 
P. scopulorum var. villum (J. G. Agardh) 
comb. nov. 
P. villum J. G. Agardh (1863:941) ; Lopho- 
siphonia villum (J. G. Agardh) Setchell 
and Gardner (1903), Hollenberg (1942^: 
535) 
Fig. 7 A 
This variety is usually saxicolous and has 
erect branches mostly 5-8 mm high with seg- 
ments mostly longer than broad, arising at 
intervals of mostly 4-6 segments. The branches 
are more slender than those of var. scopulorum , 
arise mostly at more distant intervals, and are 
not noticeably narrowed at the base. 
Cribb (1956:138) places P. villum in syn- 
onomy with P. scopulorum , the latter having 
priority. A number of specimens from the At- 
lantic examined by the writer and most of those 
from the Pacific coast of the United States con- 
form more closely to the description given for 
P. villum. The latter is retained as a variety. 
type locality: "Ad littus americae tropica," 
probably on the Pacific coast of Mexico. 
collections examined: Hawaiian islands 
— D. 22502, tetrasporic, intertidal, Beach Park 
near Honolua, Maui, legit H., T., and B., 
Apr. 20, 1965; D. 20209, in algal turf, Kaena 
Ponds, Puna District, Island of Hawaii, Mar. 
19, 1965; TUAMOTU ARCHIPELAGO — D. 
11160B, coating on coral, entrance to lagoon 
Raroia Atoll, July 9, 1952; society islands — 
a collection, D. 14701, by J. Randall, Moorea 
I., Tahiti, May 30, 1956; American Samoa — 
T. 678B, tetrasporic, in shallow water near the 
shore, Vatia Bay, Tutuila L, legit R. Buggeln, 
