OF NORTHUMBERLAND AND DURHAM. 313 



2. P. VULGARIS, Ag. Harv. Man., p. 217. Pliyc. Brit., t. 211. 



Atlas, PI. LXXIV., fig. 346. Johiist. and Cr., 



t. 206 (A. B.). 

 On rocks, &c., with the preceding, and possihly only a variety 

 of that species. It differs in nothing except in having an un- 

 divided lanceolate frond. — N. D. 



77. BANGIA, Zyw^J, 



1. B. Fusco-PURPUREA, Lijngh. Harv. Man., p. 217. Phyc. 



Brit., t. 96. Atlas, PI. LXXIV., fig. 347. 



Conf. Jusco-inirp., E. Bot., t. 2055; and Conf. atro- 



purp., t. 2085. Johnst. and Cr., vol. iv., p. 135. 



" In limestone caves between Sunderland and Shields. On 



Marsden Rocks and Sunderland Pier. On Blackhall Rocks. — 



John Hogg, Esq^ — Winch. Near Berwick. — Dr. Johnston. 



North Sunderland, Hartley, Whitley Rocks, and Cullercoats. — 



G. S. B. I have not been able to find this plant in any place 



on the Durham coast, and I much question its present existence 



in the Shields, Sunderland, or Marsden habitats quoted above. 



It seems to be of tolerably frequent occurrence on the coast of 



Northumberland. — N. D. 



78. RIVULARIA, Roth. 



2. R. ATRA, Roth. Harv. Man., p. 222. Phyc. Brit., t. 239. 



Atlas, PI. LXXV., fig. 352. E. Bot., t. 1798. 

 Johnst. and Cr., vol. iv., p. 145. 

 " On the sea-shore, upon Algje and corallines." — Winch, — 

 N. D. 



79. CALOTHRIX, Ag. 

 1. C. coNFERVicoLA, Ag. Harv. Man., p. 224. Phyc. Brit., t. 

 254. Atlas, PI. LXXV., fig. 356. Johnst. and 

 Cr., vol. iv:, p. 153. 

 Conferva coiifervicola. E. Bot., t. 2576. 

 Parasitical on the smaller Alga^. Near Berwick, — Dr. John- 

 ston. Marsden.— G. S. B.—N. D. 



