FucecsP}^ CYSTOSEIRA. 103 



"Boll on, thou deep and dark blue ocean, roll! 

 Ten tliousand fleets sweep over thee in vain. 



"P "I" 'P •!» •!• 



Thy shores are empires, changed iu all save thee. 



« » * * 4: 



Time writes no wrinkle on thine azure brow : 



Such as creation's dawn beheld, thou rollest now." — Byron. 



Genus II. CYSTOSEIRA, Agardh. 



Generic Character. Frond furnished with branch-like leaves, 

 becoming more filiform upwards. Air-vessels simple, arranged 

 consecutively within the substance of the branch-like leaves. 

 Receptacles cylindrical, more or less lanceolate, tuberculated, 

 terminal. Seeds in distinct cells. — The name is from two Greek 

 words signifying a little mc and a chain. — Greville. 



1. Cystoseira ERicoiDES, Afjarclk, 



Habitat. Rocks in the sea. Perennial. Summer and 

 autumn. Devonshire, Mrs. Griffiths ; Cornwall, Mr. Ralfs ; 

 Yarmouth, Miss Turner ; Bantry Bay, Miss Hutchins. It 

 was once found by me on the coast of Ayrshire at an early 

 stage of my Algol ogical studies. Its heather-like aspect 

 being new to me, I sent it to Sir W. J. Hooker, w ho fanned 

 my incipient zeal by marking it Cystoseira ericoicles, new to 

 Scotland ! It was found also by my talented friend, Daniel 



