80 MARINE ALGJE 



a wide-forking manner; sometimes a branch will divide into several 

 parts at the same point ; color dark brown or purple. It is found, in 

 summer only, from Long Island Sound northward, growing on smooth 

 rocks which are exposed to the action of the waves. 



GENUS Liagora 



Fronds filamentous ; branching regularly in a forking manner 

 to the very top, forming thick bunches ; slightly incrusted with 

 lime, yet some what viscid. It is found in Florida and California, 

 and abounds in tropical waters. 







SUBORDER CHJETANGIEJE 

 GENUS iScinaia 



S. furcellata. Frond cylindrical, one eighth of an inch in diameter, 

 tapering at base, sometimes constricted at intervals, regularly and sev- 

 eral times forked, ending in short divisions ; branches of same length, 

 giving a level top ; two to four inches high ; lake-red. When pressed 

 the axis is visible, giving the appearance of a flat frond with a midrib. 

 This species is found in summer only, washed ashore from Cape Cod 

 southward and on the California coast. It is not common. (Plate 

 XVII.) 



SUBORDER GEUDIEJE 



GENUS Gelidium 



G. corneum. Frond flat and horny, one inch to four inches high, 

 narrow, erect, branched several times in the same plane ; ultimate 

 branch lets club-shaped, or swollen at the tips with masses of spores; 

 color purple-red. It grows in tufts on mud-covered rocks, and on algae 

 at low-water mark. The typical form is found in Florida and on the 

 Pacific coast. Smaller plants are found all along the Atlantic shore. It 

 is an extremely variable plant, and is often difficult to distinguish on this 

 account. (Plate XVII.) 



ORDER GIGAETINACEJE 



GENUS Chondrus 

 Carrageen or Irish moss. 



C. crispiis. Frond begins with flattened stem, which divides and 

 subdivides many times in a broad-forked, fan-like manner; varies 

 greatly in length and breadth of divisions, also in size and color, accord- 

 ing to conditions of its habitation. In shallow tide-pools it is pale and 



