Marine Algce of Berwick-on-Tweed. 343 



DELESSEKIA, Lamour. 



Delesseria alata (Huds.) Lamour. 



Ess., p. 124. — Fucus alatus, Huds., Fl. Angl., p. 578. 

 Descr. Delesseria alata, Harv., Phyc. Brit. 

 Fig. „ „ Harv., I.e. pi. 247. 



Exsicc. ,, ,, Wyatt, Alg. Danm., no. 14 ; Crouan, Alg. Finist., 



nos. 263 et 264; Le Jol., Alg. Mar. Cherb., no. 227. 

 Syn. „ „ /. Ag., Spec. Alg. II., p. 683 ; Id., Epicr., p. 483; 



Grev., Alg. Brit., p. 74. 

 Hypoglossum alatum, Ktz., Phyc. Gen., p. 445 ; Ktz., Spec. Alg., 

 p. 877. 

 Hab. On rocks and Algaa at and below low-water mark. All the year. 

 Fruit Jan. — May. Common along the whole coast. 



The narrow variety (b. angusti folium,, Crouan, Alg. Finist , no. 

 264) is very common on Laminaria stems, but the typical form 

 of Delesseria alata with wide membranous wings to the stems is 

 far from common with us. 



Delesseria angustissima, Griff. 

 in Harv., Phyc. Brit., pi. 83. 

 Descr. et Fig. Delesseria angustissima, Harv., I.e. 



Syn. „ „ J. Ag., Spec. Alg. n., p. 686 ; Id., 



Epicr., p. 482 ; Harv., Man., p. 115. 



Delesseria alata, var. angustissima, Ag., Spec. Alg. i., p. 179 ; Ag., 



Syst., p. 250 ; Grev., Alg. Brit., p. 74 ; Hook., Br. Fl. n., p. 



286. 



Hypoglossum angustissimum, Ktz., Spec. Alg., 877 ; Id., Tab. 



Phyc. xvi., t, 16. 

 Hypoglossum carpophyllum, Ktz., I.e. t. 17. 

 llhoclymenia rostrata, J. Ac/., MSS. 



Gigartina pnrpurascens, var. Lynffb., Hyclr. Dan., p. 46, t. 12. 

 Gelidinm ? rostratum, Griff., in Harv., Man. Ed. i., p. 82. 

 Hab. " Berwick bay on Laminaria stems, Johnston." Brady, List of 

 Northumberland and Durham Algre 



I have never met with this species at Berwick, and have seen 

 no specimens from that locality. I suspect the plant alluded to 

 by Johnston and Brady was nothing more than the narrow 

 variety of Delesseria alata. 



