RED SEAWEEDS | 91 
branches ; color rose-pink. It grows on wharves and on algz below low- 
water mark, and is a common and beautiful species. It is found (but 
only in the spring) from New York northward, and is abundant in Long 
Island Sound. (Plates XXX, XXX1I.) 
C. Pylaisei. Fronds three to six inches long, more robust and 
darker in color than in C. Americanum ; main and secondary branches 
alternate, decompound, all bearing at short intervals short opposite 
branchlets, which in turn are covered with ramuli. Itis found in spring 
on wharves and on alge from Boston northward. (Plate XXX.) 
C. Baileyt. Fronds one inch to three inches long, with main stem as 
thick asa bristle, and running to the top of the frond; branches around 
the main stem longer at the base than at the apex, giving the plant a 
pyramidal outline; branches also have a main stem and short branches 
beset with branchlets; shrub-like in aspect; color purplish-red. Com- 
mon in summer from New York to Cape Cod. 
C. setrospermum. Frond two to five inches high, pyramidal in out- 
line; has main stem and alternate lateral branches; branches have 
secondary branches beset with delicate, erect branchlets; hair-like in 
fineness. It is common from Cape Cod southward, and is plentiful in 
Long Island Sound. (Plate XXXI.) 
C. byssoideum. Fronds one inch to three inches long ; filaments very 
delicate ; main branches many times divided ; secondary branches long ; 
many branchlets; rose-colored. It grows in globose tufts, and is com- 
mon in Long Island Sound. (Plate XXXI.) 
C. floccosum. Fronds three to six inches long, hair-like in fineness ; 
flaccid; main branches sparingly branched below; numerous alternate 
branches above ; all clothed with short, simple branchlets; color dark 
brownish-red. The plant is so exceedingly fine that it is difficult to dis- 
tinguish the divisions. It grows on eel-grass and on alge below low- 
water mark, and is found from New York to Cape Cod. (Plate XXXI.) 
Genus Griffithsia 
(Named for Mrs. Griffiths, an English algologist) 
These are among the most beautiful of seaweeds, because of 
their brilliant color and exceedingly delicate structure. They 
grow in deep water, and specimens cast ashore are usually torn 
and imperfect, but they may often be gathered from deep tide- 
pools, and sometimes are found growing on eel-grass. If placed 
in fresh water they discharge their coloring-matter and quickly 
decompose. 
G. Bornetiana. Fronds two to five inches high; filaments jointed, 
the divisions being long and pear-shaped, growing shorter as they near 
the top; repeatedly forked; very soft and fragile. It grows in tufts, 
resembling corals; attains perfection in July, and disappears later in the 
summer. Found from Cape Cod southward, washed ashore after storms. 
(Plate XXXII.) 
