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 BHODOPHYLLIDEJB 



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 j 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 Bhabdonia in having bladdery branches; otherwise it is easily 

 mistaken for it. 



C. clrrhosa. 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 branehlets, each one of which, under a glass, shows a 

 notch in the tip. This beautiful, bright-red alga is found in abundance 

 north of Capo Cod. It differs from Delesseria alata in having no midrib 

 or veins. It grows in deep water on stones, shells, and algae. (Plate XXI.) 



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 

 XXI.) 



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 



