RED SEAWEEDS 83 
simple or lobed; surface sometimes roughened by collections of 
spores in dots; dark red, often glittering in the water with blue 
and purple tints. It is found on the Pacific coast. (Plate XX.) 
SUBORDER RHODOPHYLLIDEZ 
Genus Cystoclonium 
C. purpurascens. The translucent, fleshy, juicy main stem, one 
eighth of an inch or less in diameter, runs through the whole plant; 
irregularly branched all around main stem; branches again branch in 
same manner; branches attenuated at the base, and taper to a long 
point; smaller branches distended in places by spores into bladder-like 
swellings, hence the name; color rose-red to dark purple; plants ex- 
posed on the beach often faded to orange and white; six to eighteen 
inches long. It grows on rocks between tide-marks as well as in deep 
water. With the exception of Ceramium rubrum, this is the most com- 
mon red alga on the eastern coast from New York northward. It differs 
from Rhabdonia in having bladdery branches; otherwise it is easily 
mistaken for it. 
C. cirrhosa. Ends of branches terminate in spirals like tendrils; 
otherwise identical with C. purpurascens. (Plate XX.) 
Genus Euthora 
E. cristata. Frond one inch to five inches high, membranaceous, 
broadly spreading; divisions wide and numerous, ultimately becoming 
fine like minute branchlets, each one of which, under a glass, shows a 
notch in the tip. This beautiful, bright-red alga is found mm abundance 
north of Cape Cod. It differs from Delesseria alata in having no midrib 
orveins. It growsin deep water on stones, shells, andalge. (Plate XX1.) 
Genus Rhodophyllis 
(“* Rosy leaf") 
R. veprecula. Frond two to five inches long, one fourth of an inch 
to one and one half inches broad, membranaceous, forked ; margin cov- 
ered with leaflets which are in turn edged with minute branchlets; color 
deep red. It is found on the northern New England coast. (Plate 
XX. 
Genus Rhabdonia 
(‘A wand "’) 
R.tenera. Frond six to eighteen inches long, cylindrical, fleshy, 
translucent, juicy; irregularly and profusely branched, branches long- 
est at the base, erect, tapering at both ends, numerous branchlets; some- 
times the main stem runs through the plant, sometimes it is lost in the 
