266 BRITISH SEA-WEEDS. 



'" This plant was first discovered and described by that 

 eminent botanist, the late Robert Brown, after whom it 

 has been named by Dr. Harvey. It grows on rocks in 

 caves, etc., where it is exposed to both salt and fresh 

 water. It is perennial, and rare. 



Cladophora Magdalense. Miss Magdalene 

 Turner's Cladophora. 



Fronds very slender, interwoven, slightly branched, about 

 an inch long, of a dull dark-green colour and rigid substance ; 

 branches irregular, alternate or forked, spreading, curved ; 

 branchlets scattered, secund, sickle-shaped, not always pre- 

 sent ; cells about four times as long, as they are broad, 

 those above rather shorter than those below. 



This insignificant plant was discovered growing on the 

 roots of algsBj in Jersey, by the lady whose name it bears. 

 It is doubtful whether it be entitled to specific rank. 



Cladophora flavescens. The yellowish Clado- 

 phora. 



Fronds growing in floating masses, very slender, inter- 

 woven, sparingly branched, of a yellowish-green or yellow 

 colour, and soft silky texture ; branches forked, spreading, 

 angularly bent ; branchlets few, alternate or secund ; cells 

 aboub eight times the length of their diameter. 



This species is annual^ and grows, during summer, on 

 the surface of pools of brackish or fresh water. It may 

 be known by the yellow colour and long cells of its 

 fronds. 



