A CATALOGUE OF THE BRIRISH MARINE ALG.'E 93 



Fam. GRATELOUPIACE^ Schm. 

 Gen. 227. HALYMENIA Ag. 



H. latifolia Crn. Blackhead, Co, Antrim. Very rare ; only 

 obtained by dredging. 



Gen. 228. GRATELOUPIA Ag. 



G. Jilicina Ag. Coasts of Somerset (Minehead) ; Cornwall 

 (Padstow, St. Minver, Mount's Bay, Falmoutb, Whitsand Bay) ; 

 Devon (Ilfracombe, Lynmouth, Torbay, Exmouth, Sidmouth) ; 

 Suffolk (Felixstowe). Wales (Aberystwith). Channel Islands (Jer- 

 sey, Guernsey). Var. /3 intermedia Holm. & Batt. Devon (Torquay, 

 Exmouth). Channel Islands (Guernsey). 



Gr. dichotoma J. Ag. Coasts of Somerset (Minehead) ; Cornwall 

 (St. Michael's Mount, St. Minver. Trevone, Falmouth, Fowey, 

 Newquay) ; Devon (Plymouth). Rare. 



Gr. minima Crn. Coast of Devon (Ilfracombe, Torquay). Rare. 



Fam. DUMONTIACE^: Schm. 

 Gen. 229. DUMONTIA Lamour. 



D. incrassata Lam. ( = Ulva incrassata Miill. Fl. Dan. t. 653 

 (1775), non Huds. Fl. Augl. ed. 2, p. 572; U. frliformis Huds. Fl. 

 Angl. ed. 2, p. 570 (1778) ; Dmnontia Jilifonnis Grev.). Coasts of 

 Cornwall, Devon, Dorset, Hants, Essex (Blackwater Estuary) ; 

 Norfolk (Cromer), Yorks., Durham, Northumberland, Cheshire, 

 Isle of Man, Wales, Scotland, Ireland, and the Channel Islands. 

 Common on most parts of the British coasts. Var. /3 crispata. 

 Coasts of Devon (Torquay) ; Northumberland (Budle Bay, Berwick). 

 Scotland (Dunbar, Joppa, Leith, Elie, &c.). Not uncommon. 



Gen. 230. DUDRESNAYA Bonnem. 



D. verticitlata Le Jol. (= Ulva verticillata Velley in Wither. Bot. 

 Arr. ed. 3, vol. iv. p. 127 (1796), e spec. orig. in Herb. Kew. ; 

 D. coccinea Crn.). Coasts of Cornwall (Falmouth, Fowey, Tor- 

 point) ; Devon (Plymouth, Wembury, Salcombe, Torquay, Ex- 

 mouth, Sidmouth); Dorset (Weymouth, Swanage, Studland); 

 Sussex (Brighton). Scotland: Haddiugton (near Dunbar); Ork- 

 ney (Kirkwall) ; Bute (Arran and Cumbrae) ; Ayr (Saltcoats). 

 Ireland (Bantry). Channel Islands (Jersey, Guernsey). Rare. 



Gen. 231. DILSEA Stackh. 



D. eclulis Stackh. ( Irid&a eduJis Harv.). Coasts of Cornwall, 

 Devon, Dorset, Hants, Sussex, Kent, Essex, Norfolk, Yorks., 

 Durham, Northumberland, Isle of Man, Wales, Scotland, Ireland, 

 and Channel Islands. Common. 



Fam. NEMASTOMACE.E Schm. 



Tribe SCHIZYMENIE^E Schm. 



Gen. 232. CALOSIPHONIA Crn. 



C. vennicularis Schm. (= C, Fiiiisterrte Crn.i. Coasts of Dorset 

 (Weyrnouth) and Channel Islands (Jersey). Very rare. 



