RED SEAWEEDS 85 
SUBORDER RHODYMENIEE 
Genus Rhodymenia 
(‘‘ Red membrane”) 
R. palmata (“hand-shaped”). The plant commonly known as dulse. 
Frond rises from a disk in a short cylindrical stem which spreads into a 
thin, broad, fan-shaped membrane six to twelve inches long and four to 
eight inches wide at the top; deeply and irregularly cleft into many 
wedge-shaped segments ; margin usually entire, but often with leaflets; 
ends of segments indented, showing where divisions will ultimately 
occur; color dark purplish-red. It grows on rocks and on algw below 
low-water mark, and is common on the New England and California 
coasts. This is an edible alga, and, like Chondrus erispus, is an article of 
food in seaports. (Plate XXII.) 
Genus Lomentaria 
L. Baileyana. Fronds two to five inches high; grows in tufts; 
filaments tubular, irregularly branched; branchlets often all on one 
side; branches and branchlets curved or arched, and tapered at both 
ends; color brownish-red. It is found washed ashore from Cape Cod 
southward. (Plate XXII.) 
GENUS Champia 
C. parvula. Frond two to six inches long, irregularly branched ; 
grows in tufts; filaments hollow and constricted, so that they appear 
somewhat like a string of beads; color brownish-purple. It is found 
washed ashore from Cape Cod southward. (Plate XXIII.) 
Genus Chylocladia 
C. articulata. Frond filamentous, three to twelve inches long, 
hollow, constricted at intervals; branches emanate from constricted 
joints; has the appearance of a series of pink, delicate, oval sacs. 
(Plate XXII.) 
Genus Plocamium 
P. coccineum (“scarlet”). Frond a flat, semi-cartilaginous main 
stem one eighth of an inch, or less, wide, three to eight inches long, with 
alternate branches of unequal length emanating from the edges; 
branches have alternate branchlets arranged in groups of three or four 
in a row; branchlets have pinnule on the upper side, like the teeth of a 
comb (this peculiarity in branching makes the genus easy to identify) ; 
color dark lake-red. It is not found on the eastern coast, but is plenti- 
ful in California. (Plate XXIII.) 
SUBORDER DELESSERIEE 
Genus Nitophyllum 
N. laceratum. Frond expands from narrow base and divides almost ' 
at once into long, narrow, strap-shaped segments; minute leaflets, show- 
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