BRITISH MAEINE ALGiE. 



101 



Desmarestia viridis. Spring and summer. Mount 

 Edgecumbe ; Firestone Bay ; Torquay ; Exmouth. 



Dictyosiphon foeniculaceus. Summer. Torpoint ; Tor- 

 quay ; Exmouth ; Sidmouth. 



Dictyota dichotoma. Summer and autumn. Common 

 everywhere. 



Dudresnia coccinea. Summer. Mount Edgecumbe ; 



Torpoint ; Torquay ; Exmouth. 

 Dudresnia divaricata. Summer. Bovisand ; Whitsand 



Bay ; Torquay. 

 Dumontia filiformis. Spring and summer. Firestone 



Bay ; Torpoint ; Torquay. 



Ectocarpus amphibius. Summer. In muddy ditches 



of brackish water. Bristol. 

 Ectocarpus brachiatus. Summer. Mount Edgecumbe ; 



Whitsand Bay ; Torquay. Youghal. 

 Ectocarpus crinitus. Summer. Appin. Water mouth ; 



Devon. 



Ectocarpus distortus. Summer. Parasitical on Zos- 



tera marina. Appin. Saltcoats. 

 Ectocarpus fasciculatus. Summer. Whitsand Bay; 



Torquay. 



Ectocarpus fenestratus. Summer. Salcombe. 

 Ectocarpus granulosus. Spring and summer. Fire- 

 stone Bay ; Whitsand Bay ; Torquay. 



