THE ALGAE OF BERMUDA. 55 



sloping rocks, at low water mark; Harrington Sound, Castle Harbor, 

 etc. 



In habit somewhat resembling C. adhaerens and C. difforme, but 

 the frond in these is continuous, with margin entire or lobed; in C. 

 intertextum the frond is narrow and branching, the branches being so 

 densely set as to make an almost continuous coating, one branch 

 often over another. The utricles are of much the same size and shape 

 as in C. adhaerens, but the structure of the latter is dorsiventral, the 

 utricles on the upper side only, the lower, adherent surface consisting 

 of the slender tubes, which in C. intertextum form a central layer, 

 surrounded on all sides by the utricles, rarely the middle part of the 

 under surface without the utricles. C. repens Crouan, also a prostrate 

 species, has utricles even larger than C. tomentosum, of the order of 

 size of C. decorticatum; its branching is not as dense as that of C. 

 intertextum, being more like that of C. tomentosum, but without the 

 erect habit. The utricles vary somewhat in shape and size, as in all 

 species of the genus, but the long, slender shape, the end either sharply 

 truncate or slightly capitate, is distinct from the shape in all other 

 American species except C. adhaerens. Type 7070 in Collins her- 

 barium, from Tucker's Town, April 25, 1912. Also from Ely's 

 Harbor, July, Gibbet Island, Sept., Collins; Gravelly Bay, Dec., 

 Hervey. All records of C. adhaerens for Bermuda probably belong 

 here. 



2. C. TOMENTOSUM (Huds.) Stackhouse, 1795, p. 21, PI. VII; 

 Harvey, 1846-51, PI. XCIII; Collins, 1909, p. 388; P. B.-A., No. 

 1869; Conferva tomentosa Hudson, 1762, p. 480. Tucker, No. 4, 

 1856; Tucker's Town, Farlow; Kemp in herb; Moseley; Buildings 

 Bay, Harrington Sound, Shelly Bay, March, Hervey; Hungry Bay, 

 April, Ely's Harbor, Aug., Collins. Rather common about the 

 islands; sporangia found in May. 



3. C. DECORTICATUM (Woodw.) Howe, 1911, p. 494; P. B.-A., 

 No. 2017; C. elongatum Vickers, 1908, p. 22, PL XXVII; Collins, 

 1909, p. 388; Uha decorticata Woodward, 1797, p. 55. Faxon; Miss 

 Peniston; Harrington Sound, April, Aug., St. David's Island, April, 

 Cooper's Island, Gibbet Island, Aug., Collins. Very variable in 

 habit and size, but usually less densely branched than C. tomentosum, 

 the branches often quite virgate; usually compressed more or less at 

 or below the axils. But there are often cases when the two species 

 are indistinguishable by external characters; the size of the utricles 

 must then determine; in C. tomentosum 100-150 ju diam. rarely to 

 200 n; in C. decorticatum 300-400 /x diam. rarely to 200 /JL. There has 



