Marine Algm of Berwick-on-Tweed. 309 



Porphyra purpurea, b. umbilicata, Ag., Syst. Alg., p. 191. 

 Porphyra vulgaris, Ktz., Spec. Alg., p. 692. 

 Hob. On exposed rocks and stones from high -water mark to about half- 

 tide level. Fruit July — Oct. Very common along the whole 

 coast. 



DIPLODERMA, Kjellm. 



DlPLODERMA MINIATUM (Ag.) Kjellm. 



Alg. Arct. Sea, p. 189. — Ulva purpurea, b. miniata, Ag., 

 Syn. Alg., p. 42. 

 Descr. Ulva miniata, Lyngb., Hydr. Dan., p. 29. 

 Fig. Diploderma miniatum. Kjellm., I.e. t. 18, fig. 9. 

 St/rb. Porphyra miniata, Ag., Syst., p. 191; Aresch., Phyc. Scand., p. 

 181 (parfcim) ; Ktz., Tab. Phyc, vol. xix., t. 81 ; /. Ag., Till. Alg. 

 Syst. vi., p. 60, pi. ii., tigs. 44-48. 

 Hob. On rocks in deep water below tide-marks. Occasionally washed 



ashore near the Greenses. 

 A rare and beautiful species with broad, deep-red fronds, 

 often 6 inches or a foot in breadth, composed of two layers of 

 large subquadrate cells. 



In the genus Porphyra the fronds are composed of a single 

 layer of cells, while in the present genus they consist of two 

 layers. The genera Porphyra and Diploderma amongst the 

 Porphyracece are thus analogous to Monostroma and Ulva amongst 

 the Ulvaceoe. 



BANGIA, Lyngb. 



Bangia fusco-purpurea (Dillw.) Lyngb. 



Hydr. Dan., p. 83, t. 24. — Conferva fusco-purpurea, Dillw., 

 Conf., p. 5'4, t. 92. 

 Descr. Bangia fusco-purpurea, Haw., Phyc. Brit. 

 Fig. „ „ Harv., I.e. pi. 96. 



Exsicc. „ „ Wyatt, Alg. Danm., no. 167 ; Crouan, 



Alg. Finist., no. 393. 

 Syn. „ „ Ktz., Spec. Alg., p. 360; Beinke, Ueber 



die Geschlechtspflanz&n von Bangia fusco-purpurea, pis. 12, 13 ; 

 Johnst., Fl. Ber. n., p. 259. 

 Bangia atro-purpurea, Ag., Syst., p. 76 ; Ktz., Phyc. Gen., p. 250. 

 Bangia versicolor, Ktz., I.e., p. 250, t. 45, fig. 3. 

 Conferva fusco-purpurea, Eng. Bot., t. 2055. 



,, atro-purpurea, Both, Cat. Bot. in., p. 208, t. 6 ; Dillw., 

 Conf. t. 103; Eng. Bot., t. 2085. 

 Sab. On smooth rocks and stones near-high water mark. March to 

 Sept. Not uncommon, but very uncertain in its appearance. 

 Near the Coves. 



