386 
PACIFIC SCIENCE, Vol. VIII, October, 1954 
Chaetomorpha indica Kiitzing 1849: 376 
(Tranquebar, southeast India); Kiitzing, 
Tab. Phyc. 3, ph 52 III; Bprgesen 1935: 
12, fig. 2 .r 
® Fig- 6/, g 
LOCAL DISTRIBUTION: On tocks, Sta. 10 
(11327); on rocks, Sta. 11 (11415). 
These specimens have filaments from 60-90 
/i in diameter and cells of somewhat varying 
length, but mostly about as long as broad. 
They appear to be in good agreement with 
Kiitzing’s figure and with the C. indica inter- 
preted by Bprgesen from Bombay, although 
my plants do not show the slight septal con- 
strictions. As B0rgesen says, 'The shape of 
the plant may remind one of C aerea, but it 
is much thinner.” 
Chaetomorpha crassa (Ag.) Kiitzing 1845: 
204; Okamura 1931: 97. Chaetomorpha toru- 
losa Kiitzing, Tab. Phyc. 3, pL 6l II. Con- 
ferva crassa C. Agardh 1824: 99 (Adriatic 
S"") Fig. a 
LOCAL DISTRIBUTION: A few filaments 
found entangled in other algae, Sta. 4 (11195) ; 
in shallow water, Sta. 2 (11305). 
These specimens are 325-475 m in diameter 
and well within the range given by Hauck 
(1885: 439). The walls are thicker than in- 
dicated by Kiitzing. 
Chaetomorpha antennina (Bory) Kiitzing 
1849: 379; Dawson 1944: 207. Conferva an- 
tennina Bory 1804: I6l (Reunion Island) 
Fig. 6/ 
LOCAL DISTRIBUTION: Forming scattered, 
dense tufts at middle levels, Sta. 8 (11264). 
Rhizoclonium kerneri Stockmayer 1890: 
582 (type not designated) 
Fig. la-c 
LOCAL DISTRIBUTION: Forming a soft fleece 
of entangled and erect filaments, to 2-3 mm. 
thick, on mangrove roots, Sta. 12 (11393). 
These specimens appear to represent the 
same species as reported by Collins and Her- 
vey (1917: 43) under this name growing as a 
"coating on mangroves” in Bermuda. The 
filaments of my plants, 15-19 m in diameter, 
are slightly larger than theirs but about the 
same as is usually reported for this species 
elsewhere. Bprgesen (1913: 20, fig. 8) has 
found it epiphytic on Centroceras. The cells 
are mostly about 5 diameters long. A branch 
was found in only one instance. Rhizoids 
occur rarely from the prostrate cells of fila- 
ments next to the substrate. Zoosporangia 
were observed in which the cells were slightly 
enlarged at their upper ends and provided 
there with a discharge pore. 
Key to the Species of Cladophora 
1. Axes less than 30 ^ in diameter. . C. albida 
Axes over 30 \i in diameter 2 
2. Branching rather remote; cells very long 
C. patentiramea f. longiarticulata 
Branching abundant; cells not exception- 
ally long 3 
3. Branchlets fasciculate, curved 
C. inserta var. ungulata 
Branchlets not fasciculate, not markedly 
curved C. perpusilla 
Cladophora albida (Huds.) Kiitzing 1843: 
267; Kiitzing, Tab. Phyc. 4, pi. 15, fig. b. 
Conferva albida Hudson 1778: 595 (Great 
Britain) 
Fig. If, g 
LOCAL DISTRIBUTION: Forming soft tufts 
on rock surfaces, Sta. 6 (11224); on coral 
heads dredged from 2-3 m., Sta. 2 (11362). 
This is the most slender species of the re- 
gion. The intertidal plants are shorter (to 2 
cm. high) than they may often be in calmer 
habitats, but the slender axes, less than 30 /x 
in diameter, and the ultimate branches 12-15 
\x in diameter with cells 4-5 times as long as 
