BED SEAWEEDS 91 



branches ; color rose-pink. It grows on wharves and on algae below low- 

 water mark, and is a common and beautiful species. It is found (but 

 only in ths spring) from New York northward, and is abundant in Long 

 Island Sound. (Plates XXX, XXXI.) 



C. Pj/laiscvi. 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. It is found in spring 

 on wharves and on algae from Boston northward. (Plate XXX.) 



C. Baileyi. Fronds one inch to three inches long, with main stem as 

 thick as a 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. seirospei*mum. 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 algae 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 snorter 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.) 



