452 
PACIFIC SCIENCE, Vol. VIII, October, 1954 
LOCAL DISTRIBUTION: Forming a loose, 
hairy covering to 2 cm. long on coral frag- 
ments, Sta. 7 (11247). The erect filaments are 
mostly unbranched. 
My plants are referred here in sensu latiori 
for, although the species is usually cited as 
above, Howe (1920) has indicated that the 
"apparent original” of Hutchinsia obscura C. 
Agardh is equivalent to Lophosiphonia sub- 
adunca Kutzing (1843). If this is confirmed 
the Lophosiphonia obscura of recent authors 
(with 11 to 18 pericentral cells) should have 
another name which may be found either in 
Conferva intertexta Roth or Polysiphonia repta- 
bunda Suhr. 
Herposiphonia insidiosa (Greville, ex J. 
Ag.) Falkenberg 1901: 317; Tseng 1944^: 
61; Okamura 1930, leones 6: 35, pi. 264, 
figs. 10-16. Polysiphonia insidiosa]. Agardh 
1863: 926 (Indonesia) 
Fig. 58^, i 
LOCAL DISTRIBUTION: Forming low tufts to 
1 cm. high among other low algae, Sta. 6 
( 11222 ). 
This species is semi-erect in habit and rel- 
atively coarse, the determinate branchlets be- 
ing to 70-80 fjL in diameter and the main axes 
to 120 /X in diameter. The irregular disposition 
of the indeterminate branchlets and the fre- 
quent absence of branches from axis segments 
are distinctive. 
Herposiphonia tenella (Ag.) Ambronn 
1880: 197, pi. 4, figs. 9, H, 13-16; B^r- 
gesen 1918: 286, figs. 287-289 . Hutchinsia 
tenella C. Agardh 1828: 105 (Mediterranean 
Sea) 
Fig. ^9a 
LOCAL DISTRIBUTION: Creeping on Galax- 
aura growing on intertidal coral rocks, Sta. 
1 ( 11122 ). 
Tolypiocladia glomerulata (Ag.) Schmitz, 
in Schmitz and Hauptfleisch 1896-97: 441. 
Falkenberg 1901: 177, pi. 21, figs. 27-29. 
Hutchinsia glomerulata C. Agardh 1824: 158 
(Australia, Baie de Chien Marin) 
Fig. 59^, c 
LOCAL DISTRIBUTION: Frequent on coral 
rocks, Sta. 1 (11117); on rocks, shells or 
debris, Sta. 4 (11156, 11427). 
The material under 11117 and 11156 is 
small, reaching a maximum of about 2 cm. 
in length, while that under 11427, collected 
later in the season, is in full development and 
up to 6 cm. high. The four pericentral cells 
and the short, branched, determinate laterals 
are distinctive. The plant remains slender 
throughout its life, and the lateral branchlets 
do not anastomose. 
Bostrychia radicans (Mont.) Montagne, in 
Kutzing 1849: 839; Tseng 1943^: 168, pi. 
1, figs. 1-3. Khodomela radicans Montagne 
1840^: 198, pi. 5, fig. 3 (French Guiana) 
Fig. 59^, ^ 
LOCAL DISTRIBUTION: Forming a low, loose 
mat about 3-4 mm. thick on rocks Sta. 11 
(11412). 
Polysiphonia fragilis Suringar 1870: 37, pi. 
25B, figs. 1-4 (Kyushu, Japan); Okamura 
1929, leones 6, pi. 255 
Fig. 60^, b 
LOCAL DISTRIBUTION: Attached to a coral 
rock dredged in 5-7 m. off the north end of 
lie de Tre (11277). 
The specimens at hand agree with the poor 
illustrations of Suringar in size, in their five 
pericentral cells, their inconspicuous tricho- 
blasts, and rather short segments. They are 
in fair agreement with the more ample illus- 
trations of Okamura. Although they are some- 
what smaller throughout and show some 
minor morphological differences such as lack 
of the connecting rhizoids and reduced di- 
ameter of branch bases, they are in general 
accord with this species as understood by 
Okamura (1929) and seem better referred here 
than elsewhere. Segi’s reasons (1951: 253) for 
