204 Marine Algce of Benvick-on-Tweed. 



Family — B ryopsidese. 



BKYOPSIS, Lamottr. 



Bryopsis plumosa (Huds.) Ag. 



Spec. Alg , i., p. 448. — Ulva plumosa, Huds., Fl. Ang., p. 

 571. 

 Descr. Bryopsis plumosa, Harv., Phyc. Brit. 

 Fig. „ „ Harv., I.e. pi. 3. 



E.csicc. ,, ,, Wyatt, Alg. Danmon., no. 128 ; Le Jol., Alg. 



Mar. Cherb., no. 82 ; Cm., Alg. Finist., no. 400. 

 Stjn. Bryopsis Lyngbya?i, Fl. Dan., t. 1063. 



Bryopsis plumosa, J. Ag., Alg. Med. ; Ktz., Spec. Alg., p. 493. 

 Hah. In pools from half -tide level to low-water mark. April — Aug. 



Very rare. Greenses, Scremerston. 

 This prett}' plant appears to be very rare at Berwick, and all 

 the specimens which I have met with there are small and stunted. 

 The species, however, is common both to the north and south of 

 our limits. At Joppa on the Firth of Forth, it grows in the 

 greatest abundance, and I have received from Mr Traill splendid 

 specimens gathered there. 



Family — V aloniacese. 

 OODIOLUM, A. Br. 



OODIOLUM GREGARIUM, A. BraUH, 



Alg. unicell., Genera nova et minus cognita, p. 20, pi. 1 . 

 Descr. Cofliolum gregarinm, Farloio, Mar. Alg. New Eng., p. 58. 

 Fixsicc. „ ,, et C. longipes ; Holmes, Alg. Brit. Rar. 



Exsic, nos. 33 et 60. 



Codiolum longipes, Wittr. et Nordst., Exsicc, no. 458. 

 Syn. C. longipes, Foslie, Arct. ETavalg., p. 11. 

 Hub. On rocks near high-water mark. Jane — Sept. Not uncommon. 



Scremerston, Sharper Head, Greenses. 

 This minute unicellular species forms slippery, green patches, 

 often of considerable extent, ou the surface of rocks near high- 

 water mark. The fronds are clavate above, and contain a mass 

 of green endochrome which ultimately is transformed into spores, 

 at the base they are prolonged into a solid hyaline stalk, which 

 is usually longer than the clavate head, but the size of the head 

 and the relative length of the stalk is very variable. Berwick 

 specimens appear to belong to Foslie's Codiolum longipes, which 

 seems to me hardly distinct from Codiolum gregarium. 



