EHODOMELACEAE. 571 



9. Polysiphonia opaca (Ag.) Moris & De Not. Fl. Capr. 208. pi. 5 II. 1S39, 



Hutcliinsia opaca Ag. Syst. Alg. 148. 1824. 



Low-littoral on surf-beaten rocks and in tide-pools, New Providence Berry 

 Islands, Great Bahama, and Watling's Island : — Bermuda ; Florida ; and the Mediter- 

 ranean and Adriatic seas. Type from the Adriatic Sea. 



6. BRYOTHAMNION Kiitz. Linnaea 17: 105. 1843; 

 Phye. Gen. 433. 1843. 



Physcophora Kiitz. loc. cit.; Phyc. Gen. 434. 



1. Bryothamnion triquetrum (S. G. Gmel.) M. A. Howe, Jour. X. Y. Bot. Ganl. 

 16: 222. 1915. 



Fucus triqueter S. G. Gmel. Hist. Fue. 122. pi. 8. f. 4. 1768. 

 Fucus trifarius Swartz, Prod. 148. 1788. 

 Fucus triangularis J. F. Gmel. Syst. Nat. 1383. 1791. 

 Plocamium triangulare Lamour. Essai, 50. 1813. 

 Tham7iop1wra triangularis Ag. Sp. Alg. 1: 226. 1822. 

 Alsidium triangulare J. Ag. Linnaea 15: 28. 1841. 

 Physcophora triangularis Kiitz. Linnaea 17: 105. 1843. 

 Bryothamnion triangulare Kiitz. Sp. Alg. 842. 1849. 



From low-water mark down to a depth of 30 meters or more, Bimini and Caicos 

 Islands :- — Florida to Brazil. Type locality unknown. 



7. LOPHOCLADIA Schmitz, Ber. Deuts. Bot. Ges. 11: 222. 1893. 



1. Lophocladia trichoclados (Mert.) Schmitz, loc. cit. 



Conferva trichocladia Mert. fide Ag. Syst. Alg. 137. 1824. 



Ceramium Trichocladis Ag. loc. cit. 



Griffitsia? trichoclados Ag. Sp. Alg. 2: 132. 1828. 



Dasya trichoclados J. Ag. Linnaea 15: 32. 1841. 



Dasya lophoclados Mont. Ann. Sei. Xat. Bot. II. 18: 254. 1842. 



Eupogonium ? trichoclados Kiitz. Sp. Alg. 799. 1849. 



Polysiphonia trichoclada Kiitz. loc. cit. 819. 



Polysiphonia lophoclados Kiitz. loc. cit. 834. 



Lophothalia trichoclados J. Ag. Till Alg. Syst. 6: 64. 1890. 



Apparently in deep water, usually found washed ashore. Great Bahama : — Ber- 

 muda ; Florida ; Santo Domingo ; American Virgin Islands ; and Barbados. Type 

 from the West Indies. 



8. WRIGHTIELLA Schmitz, Ber. Deuts. Bot. Ges. 11: 221. 1893. 



Main branches persistent, beset with numerous 4-ranked subu- 

 late ramuli 1-4 mm. long. 1. IV. Dlodijctiii. 



Main branches commonly deliquescent, bearing filiform ramuli 



or a few subulate ramuli. 2. W. Tumonolc^cz^. 



1. Wrightiella Blodgettii (Harv.) Schmitz, loc. cit. 



Alsidium Blodgettii Harv. Ner. Bor.-Am. 2: 16. pi. 15B. 1853. 



Usually found washed ashore, presumably from deep water, Great Bahama : — 

 Bermuda and Florida. Type from Key West, Florida. 



2. Wrightiella Tumanowiczi (Gatty) Schmitz, loc. cit. 222. 



Dasya Tumanowiczi Gatty; Harv. Ner. Bor.-Am. 2: 64. 1853. 



The Bahama plants show five pericentral cells except in ramuli, but appear to be 

 otherwise identical with the Key West type. 



Found washed ashore, Berry Islands and Abaco : — Florida. Type from Key 

 West, Florida. 



