196 
PACIFIC SCIENCE, Vol. 1, October, 1947 
8. Branches radial, the plant erect, 
without trabeculae.-Bfyfl/uxr, p. 198 
8. Branches opposite mainly (in 
some marine species whorled), 
the plants with rhizomatous base 
and erect leaf-like portions, with 
trabeculae. Caulerpa, p. 199 
Part II. Phaeophyceae. The brown algae. 
Plants epiphytic, branches secund, with 
sporangia pedicellate or sessile, lat¬ 
eral or terminal. Ectocarpus, p. 199 
Part III. Rhodophyceae. The red algae. 
1. Plants epiphytic, filamentous, mostly 
microscopic, with little differentia¬ 
tion of reproductive parts, asexual 
reproduction mainly by monospores..2 
1. Plants erect, filamentous to com¬ 
pressed, wiry to firm and cartila¬ 
ginous, asexual reproduction by tet- 
raspores .3 
2. Thalli erect or creeping, uniseri- 
ate; in well-developed specimens 
3 to 4 cells thick at base, chro- 
matophore stellate. 
. Erythrotrichia, p. 200 
2. Thalli erect, arising from a pseu- 
doparenchymatous base, or from 
a single cell, branches chiefly lat¬ 
eral, chromatophores parietal. 
. Acrochaetium, p. 203 
3. Axis flattened. 4 
3. Axis terete . 5 
4. Branching pinnate, tetrasporangia 
cruciate, in sori in swollen lateral 
branches. Gelidium, p. 203 
4. Branching dichotomous or lat¬ 
eral, tetrasporangia cruciate, scat¬ 
tered in the thallus. 
. Grateloupia, p. 205 
5. Plants wiry, sparingly branched, in 
matted tufts. Wurdemannia, p. 204 
5. Plants flaccid, bushy, with many 
branches .6 
6. Tetrasporangia zonate, branches 
frequently terminating in a hook 
... Hypnea, p. 206 
6. Tetrasporangia cruciate, branches 
free.7 
7. Plants large, the thallus cylindrical 
and parenchymatous.-Crraci/draz, p. 206 
7. Plants mainly epiphytic, essentially 
filamentous .. 8 
8. With cortications, the superficial 
cells shorter than the central cell„9 
8. Without cortications, the super¬ 
ficial cells as long as the central 
cell .. ............10 
9. Plants corticated at the nodes, or but 
little beyond...... Ceramium, p. 208 
9. Cortication throughout of small 
rectangular cells in a longitudinal 
series... Centroceras, p. 207 
10. Colorless hairs lateral, spiralling, 
male and female reproductive 
structures borne in connection 
with the hairs ..Polysiphonia, p. 212 
10. Hairs in threes, terminal, tetra¬ 
sporangia borne on the deter¬ 
minate branches ..Taenioma, p. 210 
DESCRIPTIONS OF SPECIES 
CHLOROPHYCEAE 
Spirogyra Link, 1820: 5 
Two species are distinguished in this 
genus on the basis of number of chloroplasts. 
One species is from Salt Lake, and the other 
from a fresh-water pond adjacent to Uala- 
pue. Neither species can be identified be¬ 
cause of the absence of fertile material. 
Enteromorpha Link, 1820: 5 
Enteromorpha jlexuosa (Wulfen) J. Agardh, 
Till Alg. Syst. (3): 126, 1883. 
Plants tufted, to 14 cm. in height, usually 
less, crenelated or simple, with little or gen¬ 
erally no branching. Cells usually arranged 
longitudinally in a straight series (Setchell 
and Gardner 1920: 256). Specimens com- 
