94 MARINE ALG^E 



ORDER CRYPTONEMIACEJE 

 SUBORDER GLOIOSIPHONIEJE 

 GENUS Gloiosiphonia 



C" Viscid tube") 



G. capillaris. Frond six to ten inches high, solitary or in tufts ; 

 main stem cylindrical, solid above, hollow below ; from about an inch 

 above the base densely beset with short, wide-spreading branches 

 arranged evenly and all around the stem ; branches again branched in 

 the same way ; branches and branchlets attenuated at base and apex ; 

 soft, tender, juicy ; shrinks much in drying. The species is easily recog- 

 nized by its delicate gelatinous substance, tapering branchlets, and 

 brilliant red color. It is found in early summer in tide-pools on the 

 New England coast, 



SUBORDER GRATELOUPIEJE 

 GENUS Halymenia 



H. ligulata. Frond membranaceous, repeatedly and regularly 

 divided in a forking manner; the larger divisions one half of an incn 

 wide and growing very narrow at the top: four to five inches high, 

 spreading in a fan-shape ; color rose-red. It is found at Key West. 



GENUS Grateloupia 



G. Cutleria. Frond coarse, flat, variable 5 either simple, long, and 

 narrow, or short and broad, tapering at both ends, or blunt at the apex, 

 or deeply cleft into many segments ; sometimes with leaflets along the 

 edges ; height two to three feet ; color reddish-brown ; in fading, 

 changes to purple and green, and may be variegated. When simple, 

 the plant resembles Iridaea. Found on the northern California coast. 



GENUS Prionitis 



P. lanceolata. Frond narrow, flat, smooth; leathery stems, which 

 branch irregularly and sparingly from the edges ; branches bordered 

 with lance-shaped leaflets ; color dark brownish-red ; plant ten or more 

 inches high, and varies considerably. (Plate XXXV.) 



There are other species, among them -P. Andersonii (Plate XXXVI) ; 

 all are easily distinguished by the lance-shaped leaflets. Common on 

 the Pacific coast. 



SUBORDER DUMONTIEJE 

 GENUS Pikea 



J*. Californica. Divisions of frond thick, narrow, cartilaginous ; 

 central axis one eighth of an inch to one inch wide, three to four inches 

 high, thickly set with similar branches irregularly placed ; all bordered 



