Marine Chlorophyta of Hawaii, II— Gilbert 
Fig. 2. Chaetomorpha paucitatis sp. n. Basal cell 
and portion of the filament immediately above a basal 
cell showing one of the spirals. 
485 
Plants uncrowded, light green, 4.5-5 cm tall, 
in tufts of 2-5, wiry and stiff to touch, laxly 
spiralled 2-3 times in lower part; basal cells 
200-700 g long, 57-130 g wide, the longer 
ones derived from the growth of secondary 
rhizoids into the primary basal cell which has 
a disk-like holdfast; cells in lower filament 150— 
190 /x diam, occasionally constricted at septa, 
becoming larger above (to 500 /x) and inflated 
during zoospore formation; cell walls striated, 
thickness variable, up to 18 g in basal cells and 
to 14 /x in other cells. 
COLLECTIONS: Gilbert 9521 , type, growing 
on horizontal surface of cement blocks in shal- 
low water, Kuhio Beach, Waikiki, Honolulu, 
Hawaii, April 22, 1959; 9799, same location, 
May 16, 1959. 
The plants described here as new are most 
suggestive of Chaetomorpha aerea (Dillwyn) 
Kiitzing, differing from that species in its 
lighter color and in the fact that only a few 
plants arise in a tuft instead of being strongly 
gregarious. 
15. Chaetomorpha brachygona Harvey, 1858, 
Ner. Bor.-Amer., pt. 3, p. 87, pi. 46A, 
% 1 , 2 . 
COLLECTIONS: Gilbert 9921 , from muddy 
water, 1-3 feet below surface in a little bay, 
Honaunau, Hawaii, May 26, 1959; Doty 12383 A 
(in part), washed in at beach laboratory, Wai- 
kiki, Honolulu, Oahu, Feb. 6, 1958. 
16. Chaetomorpha gracilis Kiitzing, 1845, p. 203. 
COLLECTIONS: Doty 12440, in large soft 
"pillow” on very fine sand on bottom of hole 
in reef (-4 ft) at Hanauma Bay, Oahu, April 
6, 1954; 12650, forming skein of relatively un- 
tangled filaments over a "room-size” area in 
Waikiki Natatorium in about 10 ft of water 
on sandy mud bottom, Waikiki, Honolulu, 
Oahu, Sept. 25, 1954. 
17. Chaetomorpha indica Kiitzing (prox.), 
ans, in cellulis basalibus usque ad 18 g, in cellu- 1849, p. 376. 
lis aliis usque ad 14 g. Assignment of the collections below to C. 
Gilbert 9521, typus, in superficie horizontali indica is made with considerable uncertainty, 
massarum "concreti” in aqua non profunda e COLLECTIONS: Gilbert 9348, 9349, entangled 
loco Kuhio Beach, Waikiki, Honolulu, Oahu on other algae, two to four feet below the sur- 
dicto, m. April 22, 1959 lectus. face, Hauula Park, Oahu, April 2, 1959. 
