11 s ( 0LXIN8 \\l> 111 l;\ I 1 . 



of a ceil, ending below in a larger or -mailer disk. Bred filan i 

 cylindrical or very slightly tapering, Issuing from the upper but! 

 of the prostrate filament, near the middle of a cell, usually opposite 

 a rhizoid, 24 30 ft diam., walla 2 3/j thick, lower cell 2 2) diam. 

 long, other cells ; > \ diam. long, terminal cell rounded; ered filaments 

 sometimes unbranched, sometimes with a few alternate or Becund 

 branches near the apex. Fructification unknown. ( >n rocks between 

 tides, cave, Agar's Island, Aug., Nov., Collins. 



This plant form- a plush on Hat rocks a little above low water mark, 

 a- doe- R, Rothit TurtOD Nag. in similar stations on the shores of the 

 North Atlantic, and it- manner of branching resembles that of the 

 latter species hut it- dimensions arc about double. We have ex- 

 amined many specimens of /,'. Rothii, from both coasts of North Amer- 

 ica as well a- from Europe, and find very little variation in size a-' 

 them. In R. spdunearum the chromatophores are numerous -mall 

 granules, usually densely packed, occasionally looser and -ho- 

 something like a network. Type in (Ollin- herbarium, No. 8401, 

 Nov. 23, 1915. 



EL IfEMBBANACEUM Ma. nil- Hanck, 1885, J). 69; CdUithdm- 



nion membranaceum Magnus, 1874, p. 67, PI. II. figs. 7-15. In bryo- 

 zoans, Bethel's Island, Dec, Collins. 



Family GRATELOUPIACEAE. 



\\ w.\ m i:\ia Agardh. 



•ad many times dichotomous, digitate, cylindrical. 1. II. Agardhii. 



1. Frond plane, Bimple or proliferous. 2. 



2. Thin, not gelatinous. 1. II. bermudensis. 



2. Thicker, gelatinous. 3. 



3. Large echinate cell- in subcortex. 2. II. echinophysa. 



3 Pew or no echinate cells in subcortex. 3 B. pseudofl 



1. H. BERMUDENSIS Collins cV Howe. 1916, p. L69; P. B.-A., No. 

 2050; Plate V, fi,L r . 34, plate VI, fig. 37. Ill -hallow water in clefts of 



rock- and among root- of mangroves, often in loose, unattached 

 masses. Kemp. Aug., a- Rhodymenia palmata; Walsingham, Feb., 



Fallow; Oct., Miss IVni-ton; near Hamilton. .lime, Tucker's Town. 

 -Inly. Howe; Green Bay, March. Wad-worth; Harrington Sound, 

 •Ian.. Tucker's Town. Feb., Dec., Dingle Bay, March. Grasmere, 



