EHODOMELACEAE. 577 



posed and one springing from each segment, while H. Wurdemanni has two- 

 ranked ramuli, one from every second segment; the main axes of D. rigidula 

 are also sometimes corticated towards base. 



On rocks and various algae in shallow water, Berry Islands, Great Bahama and 

 Exuma Chain : Bermuda ; Adriatic and Mediterranean seas. Type from Spalato 

 Adriatic Sea. 



17. DASYOPSIS Zanard. Saggio Class. Fie. 52. 1843. 



EUPOGODON Kiitz. Phyc. Germ. 312. 1845. 

 1. Dasyopsis Antillarum M. A. Howe, sp. nov. 



Plants dark vinaceous-purple, claret-brown, or orange-rufous, 4-10 cm. 

 high, rather copiously, irregularly and radially branched, or quasi-pinnate, occa- 

 sionally subdichotomous below; main axes subterete or slightly flattened, 1-2.5 

 mm. in diameter; principal branches showing more or less numerous subspines- 

 cent branchlets 1-3 mm. long, the surface clothed at and near the apices, or 

 sometimes to bases of the branches and branchlets, with more or less tufted 

 dichotomous, monosiphonous, often early deciduous ramelli, these springing 

 chiefly from slightly elevated cushions or sorus-like spots, the segments mostly 

 15-26 M in diameter, usually 3-6 times as long as broad; cortical cells mostly 

 rather short, 12-70 \i long, 1-5 times as long as broad ; stichidia fusiform, 300- 

 450 /* long, 75-150 M in maximum width, borne close to the rhachides, on one- 

 celled pedicels or sometimes apparently sessile on the rhachides, occasionally 

 proliferous at apex and bearing short trichophylls. 



On corals in shallow water and washed ashore, Fort George Cay, Caicos Islands 

 (Howe 5625 type), and Atwood Cay. 



Dasyopsis Antillarum in color and in the character and arrangement of the 

 monosiphonous ramelli bears some resemblance to small conditions of Dasya> pedicel- 

 lata, but differs in the more copious and more irregular branching, in having short 

 subspinescent branchlets, in the shorter cortical cells, in the absence of visible peri- 

 central siphons at the apices, in the more proximal location of the stichidia, etc. 



Prom the Bermudian Dasyopsis spinuligera (Collins & Hervey) M.A.Howe (Dasya 

 spinuligera Collins & Herv. Proc. Am. Acad. 53 : 130, pi. 4. f. 2^, 25. 1917), D. Antil- 

 larum differs in being much larger and coarser, in the more vinaceous-purple color, 

 in the softer longer-celled monosiphonous ramelli, and in the shorter, more fusiform 

 stichidia (the stichidia of D. spinuligera are eventually cylindric, with conic apex, 

 and 600-800 u long by 75-80 w in diameter, and they are often geminate). 



From the Adriatic and Mediterranean Dasyopsis penicillarfa and D. spinella, the 

 species differs much in habit and in not having the monosiphonous ramelli confined 

 to the apices but springing irregularly from the cortex or from slightly elevated 

 cushions or sorus-like areas. 



18. FALKENBERGIA Schmitz, in Eng. & Prantl, Nat. 

 Pflanzenfam. I 2 : 479. 1897. 



1. Falkenlbergia Hillebrandii (Born.) Falkenb. Ehodomel. 689. 1901. 

 Polysiphonia Hillebrandii Born. ; Ardiss. Phyc. Med. 1 : 376. 1883. 



On roots of Rhizophora, etc., in shallow water, Gun Cay and Exuma Chain : 

 Bermuda to Barbados ; Canary Islands ; Mediterranean Sea. Type from the Canary 

 Islands. 



19. HALODICTYON Zanard. Saggio Class. Fie. 52 

 (as Ealydictyon} . 1843. 



HANOWIA Sond. Bot. Zeit. 3: 52. 1845. 

 COELODICTYON Kiitz. Phyc. Germ. 287. 1845. 



1. Halodictyon mirabile Zan. loc. cit. 



On and with other algae (Heterosiphonia Wurdemanni, Jania, Polysiphonia, 

 etc.), Exuma Chain and Little Inagua : Florida and Barbados; Mediterranean and 

 Adriatic seas. Type from the Adriatic Sea. 



