Marine Algce of the Dunhar Coast, 293 



spring. Host plants : Laminaria hyperhorea, Odonthalia dentata, 

 Ptilota plumosa, &c. 



Family.— SOLIEEIACE^. 

 CATENELLA, Grev. 



127. Catenella Opuntia (Good, and Wood.), Grev. 



In dark crevices and on vertical rocks, in the shade, near high- 

 water mark. Perennial. Tetraspores in July. Extremely fine, 

 and in abundance, in creeks and channels below the cliffs west of 

 Dunbar. 



Family.— GELIDIACE^ 

 GELrDITJM, Lamour. 



128. Geliditun comeum (Huds.), Lamour. 



In sandy pools west of the castle, near the boys' bathing pool. 

 Perennial. Fruit in August. 



Family.— SPOXGIOCAEPE^. 

 POLYIDES, Ag. 



129. Polyides rotundus (Gm. ), Grev. 



Common, and often of large size, on sandy rocks in pools near 

 low-water mark. Perennial. Fruit in winter. 



Family.— RHODOMELACE^. 

 ODONTHALIA, Lyngb. 



130. Odontlialia dentata (Linn.), Lyngb. 



On stones and rocks from a little below the low-water mark of 

 ordinary tides to deep water. Common, and often of large size. 

 Perennial. Fruit in winter. 



RHODOMELA, Ag. 



131. Rhodomela lycopodioides (Linn. ), Ag. 



Epiphytic on stems of Laminaria liyperhorea ; also on perpen- 

 dicular rocks in the shade at low-water mark at the west of the 

 castle, and at other places in the district. Perennial. Fruit in 

 June, July, and August. 



131a. Rhodomela lycopodioides, var. /3. laxa, Kjellm. 



In pools near low-water mark east of the esplanade. Perennial. 

 Eather rare. 



132. Rhodomela subfusca (Woodw.), Ag. 



Common on rocks and stones in pools between tide marks. 

 Perennial. Tetraspores in swollen ultimate ramuli in summer, and 

 in stichidia in winter. 



