OF NORTHUMBERLAND AND DURHAM. 279 



2. M. viRESCENS, Carm. Harv. Man., p. 47. Phyc. Brit., t. 



82. Atlas, PI. XIV., fig. 57. Jolinst. and Cr., 



vol. iii., p. 115. 

 In pools near high-water mark. Holy Island, Bambro', and 

 CuUercoats.— -G^. S. B.—^. 



19. LEATHESIA, Gray. 



1. L. TUBERiPORMis, Gray. Harv. Man., p. 48. Phyc. Brit., 

 t. 324. Atlas, PL XIII., fig. 54. Johnst. and 

 Cr., vol. iii., p. 117. 

 Rivularia taberlformis. E. Bot., t. 1956. 

 On rocks, &c., between tide marks. Holy Island, Bambro', 

 Marsden, Cullercoats, &c. Abundant in the north, but decreas- 

 ing in frequency southward. It is mostly parasitic on other 

 Alg^, such as CoralUna and Laurencia, and, in its turn, is often 

 fastened upon by the more delicate filamentous species. — N. D. 



20. RALFSIA, BerTt. 



1. R. VERRUCOSA, Aresch. Harv. Man., p. 49. Phyc. Brit., 

 t. 98. Atlas, PI. XV., fig. 60. Johnst. and 

 Cr., vol. iii., p. 121. 

 On rocks near high- water mark in Berwick bay. — Dr. John- 

 ston. Near Hartley. — G. S. B. — N. 



21. ELACHISTA, Fries. 



1. E. FucicoLA, Fries. Harv. Man., p. 49. Phyc. Brit., t. 



240. Atlas, PI. XV., fig. 61. Johnst. and Cr., 

 ^ vol. iii., p. 123. 



Conferva flaccida. E. Bot., t. 2310. 

 Parasitic on Fucus vesiculosus ; rarely on F. serratus. Very 

 common. — N. D. 



2. E. FLACCIDA, Aresch. Harv. Man., p. 50. Phyc. Brit., t. 



260. Atlas, PI. XV., fig. 62. Johnst. and Cr., 

 vol. iii., p. 25. 



