200 
Examination of a large number of speci¬ 
mens collected in the fishponds and in 
marine habitats, as well as those deposited 
in the herbarium of the Bishop Museum, 
Honolulu, and the herbarium of the Univer¬ 
sity of California, Berkeley, has led the 
writer to believe that there is much varia¬ 
tion in specimens as well as in interpretation 
of Ec to carpus in die us. These notes, and 
those that directly follow, are a result of the 
examination of a large series. Such studies 
have led the writer to consider Ectocarpus 
Mitchellae in the sense of Saunders (1901, 
in Tilden 1901&) and E. Sargassi Saunders 
as identical with the material in the present 
investigation. These specimens are from 
Hawaii and are distributed by Tilden 
(American Algae Century V, nos. 439, 440a, 
and 440b). I have examined both Bishop 
Museum and University of California speci¬ 
mens of the exsiccatae and find them iden¬ 
tical with E. indicus. 
Ectocarpus indicus Sonder, in Zollinger, H. 
Verzeichn. . . . indischen Archipel. . . . 
1842-48, p. 3 (not as usually cited: in A. 
Moritzi, Syst. Verzeichn, 1857) (see Fig. 
3 a-d). 
Ectocarpus Duchassaingianus Grunow, Alg. 
Novara, 1870, p. 45. 
Ectocarpus Sargassi Saunders, in Tilden 
American Algae Century V, nos. 440a and 
440b, 1901 h. 
Plants tufted, branching primarily dicho¬ 
tomous with many lateral branches, the main 
branches about 10 n wide. Sporangia at¬ 
tached, sessile or stalked, on the inner sur¬ 
face of the branches, oval to oval-clavate, 
distributed throughout the plant. Plants ris¬ 
ing from a creeping base. 
Abundant in Kuapa Pond, usually on 
Bat is maritima; Wailupe, Molii Ponds, on 
Oahu Island. Also found in Keawanui, Ku- 
peke, Ualapue, Niaupala Ponds, Molokai 
Island. 
PACIFIC SCIENCE, Vol. 1, October, 1947 
In the marine habitat, commonly occur¬ 
ring on species of Sargassum. 
Specimens examined (in U. C. Herb.): as 
Ectocarpus indicus, Potts 1173a, determined 
by Setchell, from Samoa; Lindauer 28, det. 
Lindauer, from New Zealand; Nasr 259 
from Egypt (Red Sea); Li 124 ex herb. 
Tseng, det. Setchell, from China; K. G. 
Iyengar 83, det. Gardner, from Bombay; as 
E. Duchassaingianus: Tilden 32, det. Tilden, 
from Tahiti; Boergesen 1093, 1250, det. 
Boergesen, from the Virgin Islands 3 ; Hamel 
45, det. Hamel, from the French Antilles; 
Taylor 39308, 39602, det. Taylor, from the 
Netherlands West Indies. 
Tilden 440a, 440h, as Ectocarpus Sargassi 
Saunders, det. Saunders, in Tilden American 
Algae Century V; 439 as E. Mitchellae, det. 
Saunders. These specimens are from the 
Hawaiian Islands. (Exsiccatae from Bishop 
Museum and University of California Her¬ 
baria examined.) 
Distribution: Throughout warmer seas. 
Previously reported by Reed, MacCaughey, 
Lemmermann, and Neal. 
RHODOPHYCEAE 
Erythrotrichia Areschoug, 1847: 209 
Erythrotrichia carnea (Dillwyn) J. Agardh, 
Till Alg. Syst. (6): 15, 1883. 
Plants attached singly, or in small loose 
tufts, to 4 cm. in height, the uniseriate fila¬ 
ments attached to other algae by a single 
disk-shaped basal cell which may become 
lobed. The lower, older parts of the plant 
may be two or three cells in width. Chro- 
matophore stellate, with a prominent pyre- 
noid. Reproductive structures not seen. 
Found in all major fishponds, epiphytic 
on Enteromorpha spp., Grateloupia, Poly- 
siphonia, and Gelidium. Erythrotrichia car¬ 
nea is here reported from the Hawaiian 
3 These specimens as well as others collected by 
Boergesen in the Virgin Islands and identified as 
E. Duchassaingianus (1913: 159) were trans¬ 
ferred by him to E. indicus (1941: 16). 
