514 MARINE ALG^ FOUND AT BRIGHTON. [May, 



celaria radicans, Cordylecladia erecta, Laminaria saccharina 

 and L. digitata, Facusserratus, and Desmarestia aculeata. 



No freshwater stream runs into the sea within five or six 

 miles of Brighton. At this distance, on the west, the Adur 

 flows through Shoreham Harhour, where the tide rises about 

 eighteen feet. On the east there is no fresh water nearer than 

 Newhaven Harbour (nine miles off), which is the mouth of the 

 river Ouse. The saltwater ditches and marshes communicating 

 with these estuaries supply weeds peculiar to such situations. 



The following list of Algse, in which I have been careful to 

 include those only which I have myself found, or which I have 

 seen and know to have been collected on this coast, will show 

 that we have in this locality a fair share of these beautiful pro- 

 ductions of nature. The number of British species, exclusive of 

 the varieties, included in this list, amount to 192. The list com- 

 prises two plants new to England, On these I have to make a 

 few observations. 



The first-njentioned Alga is pronounced by Dr. Harvey to be 

 almost identical with Dasya punicea, from which it is said to 

 differ only in the length of the articulations of the ramuli (small 

 branches). It seems to have been first found by Mrs. Gray, 

 who met with a specimen bearing stichidia, at Bognor, in October, 

 1858. Since that time I have found at Brighton several speci- 

 mens, with both kinds of fruit. A brief description of the plant 

 will be found in the Appendix to Mrs. Alfred Gatty's recent 

 work on British seaweeds.* As the plant is new to this coun- 

 try, the following more particular description may be acceptable 

 to the reader. 



Dasya punicea. 



Stem much and irregularly branched, beset with whorls of 

 long, many times dichotomous jointed ramuli (branchlets), taper- 

 ing upwards to a point ; articulations 4 to 6 times as long as 

 broad. Ceramidia (spore cases) urceolate; stichidia linear-lan- 

 ceolate, tapering to a fine point. 



Dasya punicea, Agardh. 



Habitat. Bognor, Mrs. Gray, October, 1858; Brighton, 

 Mrs. Merrifield, July and August, 1859-61. 



* ' British Seaweeds,' by Mrs. Alfred Gatty. 4to. Bell and Daldy, London. 

 Dr. Harvey's last classification has been adopted, and this work contains a care- 

 fully-compiled " amateurs' synopsis," which will be found extremely useful. 



