habit, however, is bo very Bimilar to thai of our //. rilu 

 quota, that I cannot bul consider it as properly a member 



of the same natural mams. 



III. OYSTOSEIEJl 



•1. ericoides (The Heath-like Cystoseira) \ stem thick, 



short, cylindrical, beset with numerous, Blender, filiform 

 branches, variously divided, and densely clothed with snail], 

 spine-like, awl-shaped ramuli; air-vessels small, - 

 neatfa the apices of the branches; receptacles cylindr 

 armed with awl-shaped processes, Ag. 8p. Alg. v. L. p. 52. 

 (Atlas, PL I. Fig. \.) 

 Halerica ericoides, Kiitz. Funis ericoides, Sp. V. tamaris< 



Hinls. F. Belaginoides, JSsper. 

 Jlab. Frequent on the shores of the south of England and south 

 and weal of Ireland. On marine rocks near low-water mark, 

 and in tide-pools. Perennial. Summer and autumn. 

 This is one of the most beautiful of the British Bpec 

 Cystoseira, especially when seen growing under water. It 

 then appears clothed with the richest tints of blue and 

 preen, more like those phosphorescent gleams that flash 

 from the lower marine animals than any vegetable colours. 

 As each twig waves to and fro in the water the lines vary, 

 and sometimes, when the 1 iirlit falls partially on a branch, 

 some portions seem covered with sky-blue flowers, while 

 others remain dark. All these beautiful tints perish when 

 the plant is removed from the water. The specific name 

 ericoides, or Heath-like, alludes both to the brilliant colour- 

 ing and to the shruhhy character of the frond, which is 

 covered w ith small ramuli resembling the Leaves <>\' a Heath. 



5. graxmlata (The granulated Cystoseira); stem cylindrical, co- 

 vered with elliptical knobs, each of which bears a slender, 

 repeatedly divided, dichotomo-pinnate, filiform branch, ir- 

 regularly sel with scattered, awl-shaped, thorn-like ramuli ; 

 air-vessels small, two or three together in the upper pari of 

 the branches ; receptacles elongated, Ag. Sp. Al<i. v. 1. 

 (Am ls, PL II. Pig. 



Incus granulatus, Lin. F. concatenate, Lin. V. 



r rn. F. nodicaulis, With. Phyllacantha Boryana (?), 



Hob. In rock} basins 1-1't by the tide, at and below half-tide 

 li m\. Perennial. Summer. 



r British species of 1 Cystoseira, except Worn 



C. barbata, which lias probably no claim to be admit 



British, ('. granulata may he readily known by the knob- 



