486 
PACIFIC SCIENCE, Vol. XIX, October 1965 
18. Rhizoclonium grande B0rgesen, 1935, p. 14, 
figs. 5-6. 
Fig. 4, E 
This large Rhizoclonium was found growing 
most frequently on flat rock surfaces and nearly 
covered with a thin layer of sand which was 
probably trapped by the interwoven filaments. 
Filaments of the Hawaiian material range from 
225-400 p in diameter, with the cells from 
three-fourths to three diameters long. I have 
compared the Hawaiian plants with those of a 
collection from Mauritius (Morin 1151 ) identi- 
fied by Bprgesen as R. grande and found the 
plants in both collections to agree closely. 
COLLECTIONS: Gilbert 9509 , abundant on 
rock flats especially where covered with thin 
layer of sand, Kaena Pt., Oahu, April 18, 1959; 
9660, Anahola Beach, Kauai, April 29, 1959; 
9945, on rocks covered with thin layer of sand, 
Kahaluu Park, Hawaii, May 26, 1959; 10005, 
Honaunau Beach, Hawaii, June 1, 1959. 
19- Rhizoclonium hookeri Kiitzing, 1849, p. 
383. 
COLLECTIONS: Doty 13291, present in gas 
holes and small cracks of solid rock about 2.5 
ft above high tide line at 115 East Banyan 
Drive, Hilo, Hawaii, Aug. 16, 1956; Setchell 
5220, Coconut Island, Hilo, Hawaii, July 14, 
190% 
20. Rhizoclonium riparium (Roth) Harvey, 
1849, p. 238. 
COLLECTIONS: Gilbert 9962, in wading pool 
on Coconut Island, Hilo, Hawaii, May 27, 1959; 
Doty 8671, large mass stuck in a coral head, 
Hauula Bay, Oahu, Feb. 24, 1951; 8248, near 
mouth of Manini Gulch, Kauna, Oahu, Oct. 21, 
1950. 
2 1 . Cladophora doty ana sp. n. 2 
Fig. 3 
Plantae sparsae aut in tegetibus gregariae, 
2 Since this manuscript was accepted for publica- 
tion Cladophora patula Sakai has been described as 
new and appears to be the same species (pp. 22-25 
of Y. Sakai, 1964), The species of Cladophora from 
Japan and its vicinity, Scientific Papers of the Insti- 
tute of Algological Research, Faculty of Science, Hok- 
kaido University 5(1) : 1-104, 17 pis. 
fusco-virides, 2-4 cm alt., rudes rigidaeque, per 
extensiones rhizoidales 2-4 cellularum infi- 
marum relative brevium affixae; cellulae ad- 
modum super basales 3.5-12 mm long., ad 600 
P lat., ad extremitates distales 3-4 (raro 5) 
ramos efficientes, ramis saepe late divaricatis 
ad retrorsos, interdum contortis, ex una cellula 
sola ad hanc altitudinem plerumque constanti- 
bus, ramificatio supra plerumque di- trichotoma, 
ramis multis erectisque, cellulis, ut filamenta 
fruticulosa velut per ventum deflexa videantur, 
saepe in eadam directione curvatis, cellulis 1.2- 
4 diam long., 210-300 p lat., septis inter ramos 
crebris, cacumina ramorum obtusa; cellulae per 
plantam cylindricae, non inflatae, membranis 
striatis, in cellulis inferioribus 25 p (15-37 p) 
crass, in cellulis superioribus 12 p (7.2-18 p) 
crass. 
Gilbert 9214, TYPUS, in superficie inferiore 
rupis lacui minuente aestu imminentis, in loco 
Hookipa Park, East Maui dicto, m. March 24, 
1959 lectus. 
Plants sparse or in gregarious mats, dark 
green, 2-4 cm high, coarse and stiff, attached 
by rhizoidal extensions of the 2-4 lowermost 
relatively short cells; cells immediately above 
the basal cells 3.5-12 mm long to 600 p wide, 
giving rise to 3-4 (rarely 5) branches at their 
distal ends, the branches frequently widely di- 
varicate to retrorse, at times contorted, and 
usually consisting of but one cell at this level; 
above branching usually di- trichotomous, nu- 
merous, the branches erect with cells often 
curving in one direction to give a wind-blown 
appearance to the tufted filaments, the cells 
1.2-4 diameters long, 210-300 p wide, with 
septa frequent between branches; branch tips 
obtuse-rounded; cells cylindrical throughout the 
plant, not inflated, their walls striated, 26 p 
(15-37 p) thick in lower cells, 12 p (7.2-18 p) 
in upper cells. 
COLLECTION: Gilbert 9214, TYPE, on the 
under surface of a rocky overhang in tide pool, 
Hookipa Park, East Maui, Hawaiian Islands, 
March 24, 1959. 
This unusual and distinctive Cladophora 
bears little resemblance to other robust spe- 
cies. It is characterized by its short stature, 
