Marine ALycu of Berwiok-on- Tweed. 325 



Hab. On rocks and shells near low-water mark, also on the vertical 

 faces of cliffs exposed to the full shock of the incoming waves. 

 Fruit May — Aug. Frequent. Berwick Bay, Sharper Head, 

 Burnmouth, Holy Island. 



GHIFFITHSIA, Ag. 



GrRIFFITHSIA SETACEA (Ellis) Ay. 



Syn., p. 28. — Conferva setacea, Ellis, Phil. Trans., vol. 57, 

 t. 18, fig. e. 



Descr. Griffithsia setacea, Harv., Phyc. Brit. 



Fig. „ ,, Hare, I.e. pi. 184. 



Exsicc. ,, ,, Wijatt, Alg. Damn., do. 137 ; Crouan, Alg. 



Finist., no. 159 ; Le Jol., Alg. Mar. Cherh., no. 53. 



Syn. ,, ,, J. 0. Ag., Spec. Alg. n., p. 81 ; Id., Epicr., 



p. 69 ; Ktz., Spec. Alg., p. 660 ; Johnston, Fl. Berw. n., p. 242. 



Hab. On the perpendicular sides of deep rock pools between tide- 

 marks. Fruit April to June. Frequent. Berwick Bay, 

 Sharper Head, Burnmouth, Scremerston. 



PTILOTA, Ag. 



Ptilota plumosa (Linn.) Ay. 



Syn. Alg., p. 39.— Fucus plumosus, Linn., Mant., p. 134. 

 Descr. Ptilota plumosa, Harv., Phyc. Brit. 

 Fig. „ „ Harv., I.e. pi. 80. 



Syn. ,, „ J- Ag., Spec. Alg. n., p. 95 ; Id., Epicr., p. 75 ; 



Ktz., Phyc. Gen., p. 378 ; Id., Tab. Phyc. xn., t. 54. 

 Ceramium plumosum, Both, Gat. Bot. in., p. 133 ; Ag., Dist. p. 17. 

 Plocamium plumosum, Lamour., Ess., p. 50 ; Duly, Bot. Gal. u., 

 p. 949 ; Johnston, Fl. Berw., vol. II., p. 232. 

 Hab. On the stems of Laminaria hyperborea. Fruit nearly all the year. 

 Very common. Berwick Bay, Sharper Head, Burnmouth, 

 Spittal, Scremerston, Holy Island. 

 At Berwick this species is usually found with fruit in the winter 

 months, and specimens gathered in January and February are 

 nearly always fruited. Mr Traill, however, in his various lists, 

 gives June, July, and August as the best months for fruit in 

 the Firth of Forth. 



