Polysiphonia of the Tropical Pacific, I — Hollenberg 
91 
Koloa, Oahu, Oct 30, 1955; D. 17184 AE, 
cystocarpic, on the southwest end of Kaimua Bay, 
Island of Hawaii, Feb. 27, 1953; D. 17332.1, 
immature male, J mile southwest of Opihikao, 
Puna, Island of Hawaii, Jan. 27, 1953; T. 749, 
T. 731, T. 732, spermatangial, and T. 73 5 A all 
collected by R. Buggeln from coral and basalt, 
Vatia Bay, Tutuila L, American Samoa, Aug. 
1964. This variant is characterized by segments 
of main branches, which are mostly less than 1 
diameter long, and by relatively small sperma- 
tangial branches to 11 Op long bearing a sterile 
tip composed of a single small cell 1-3 diameters 
long. In the latter respect this variant is similar 
to a specimen of P. sphaerocarpa collected by S. 
Carlquist at Grayson’s Cove, Saccora I., off the 
coast of Lower California, Mexico, May 4, 1955. 
However, in the Mexican specimen the sterile 
tips of the spermatangial branches are up to 
280p long and composed of 3-4 cells. Tsuda’s 
specimens from Samoa and the Mexican speci- 
men are closer to var. sphaerocarpa in having 
short segments and in having intervals of 6—7 
segments between successive branches. An un- 
usual variant with respect to the spermatangial 
branches is represented by H. 65-6.6, cysto- 
carpic and spermatangial, with very delicate 
trichoblasts and with spermatangial branches 
mostly very large and lanceolate in shape, with 
a short polysiphonous terminal extension, which 
bears short lateral trichoblasts (Fig. 26). This 
specimen was collected at Kahala Park, Hono- 
lulu, Hawaii, Feb. 25, 1965. It may represent a 
case of teratology. This variant is likewise closer 
to var. sphaerocarpa in other respects. 
P. sphaerocarpa var. filifera var. nov. 
Figs. 10, 24, 27, 28 
Epiphytic or saxicolous with segments of erect 
branches mostly ca. 0.5 diameter long, with 
relatively long and persistent trichoblasts, and 
generally a more extensive prostrate branching 
system. The variety bears considerable resem- 
blance to P. poko but usually has much-branched 
erect branches, whereas the erect branches of 
P. poko are mostly unbranched. Thus far this 
variety has been collected almost exclusively in 
the Hawaiian Islands, where it is very common. 
Plantae epiphyticae aut saxicolae, proprietates specie 
generales habentes, segmentis, autem, ramorum erec- 
torurn ca. 0.5 brevioribus quam lata, trichoblastis 
relative longis persistentibusque, ramificatione pros- 
trata plerumque ampliore. 
type: D. 22532, tetrasporic, cystocarpic, on 
algal turf near Honokohau, Maui, Hawaii, legit 
H., T., and B., Apr. 20, 1965. 
ADDITIONAL COLLECTIONS STUDIED: D. 
20131, on other algae, Guam, legit E. Menez, 
Oct. 12, I960; D. 12692, cystocarpic, male, on 
Helminthocladia, at a very low tide level, 
Waianae, Oahu, legit Jan Newhouse and Henry 
Kekoanui, Jan. 2, 1954; D. 12782, tetrasporic, 
cystocarpic, male, on Chondria sp., Haleiwa 
Army Beach, Haleiwa, Oahu, legit Elvin Fong, 
Apr. 25, 1955; D. 13442, tetrasporic, intertidal 
basalt, west lip of Pohoiki Bay, Puna district, 
Island of Hawaii, Nov. 10, 1956; D. 19315.1, 
cystocarpic, male, Makua Beach, leeward Oahu, 
Jan. 21, 1962; D. 17932.5, tetrasporic, cysto- 
carpic, above low tide level at the east end of 
Maile Beach, Lualualei, Oahu, Apr. 11, 1959; 
D. 196 18, tetrasporic, male, Kahanahaiki, 
Waianae, Oahu, Jan. 27, 1962; H. 65-61.5, 
cystocarpic, in algal turf, Wawamalu Beach, 
Oahu, May 1, 1965 ; a collection by G. F. 
Papenfuss, cystocarpic, male, between Halona 
and Kaloko, Oahu, Mar. 29, 1942; H. 65-3, 
tetrasporic, cystocarpic, male, upper littoral, op- 
posite Kaneana Cave, leeward Oahu, Jan. 1, 
1965; H. 65-8.5, tetrasporic, cystocarpic, male, 
upper littoral on basalt, northeast of Waialae 
Bay, southeastern Oahu, Feb. 13, 1965; H. 
65-10, tetrasporic, cystocarpic, on Lauren cia, 
Makaha Pt, Oahu, Feb. 28, 1965; D. 22383.1, 
tetrasporic, male, in algal turf, basalt shore, 
southwest of Maalaea, Maui, legit H., T., 
and B., Apr. 19, 1965; D. 22423.1, tetrasporic 
and D. 22442, tetrasporic, cystocarpic, sandy 
beach near Camp Pecusa, Olowalu, Maui, legit 
H., T., and B., Apr. 19, 1965; D. 22484.1, 
male, basalt reef north of Kahana, Maui, legit 
H., T., and B., Apr. 20, 1965; D. 22549.2, 
tetrasporic, intertidal on Pocockiella growing 
on large boulders, Kahakuloa, Maui, legit H., 
T., and B., Apr. 21, 1965; D. 20165.1, tetra- 
sporic, 1.3 cm high, with trichoblasts of variable 
coarseness, in algal turf in tidepools, Kamoamoa, 
Puna District, Island of Hawaii, Mar. 21, 1965 
(somewhat larger and coarser than most of the 
collections of this variety) ; D. 20158, tetra- 
sporic, on Hypnea, in tidepools, Kamoamoa, 
