THE ALGAE OF BEEMUDA. 45 



1909, p. 339; Borgesen, 1913, p. 24, fig. 15. P. B.-A., No. 2011. 

 Harrington Sound, March, Hervey. To this species we have referred, 

 with some doubt, a form found in floating masses, which agrees in size 

 and length of cells, and in manner of branching, with C. crispula, but 

 does not form contorted, rope-like strands. It seems to us that these 

 may be a later development, and that our plant represents an earlier 

 stage. Similar conditions are well known in species of Rhizoclonium 

 and Chaetomorpha. 



5. C. COEALLICOLA Borgesen, 1913, p. 21, figs. 11-12; P. B.-A., 

 No. 2010. Tucker's Town, Dec, Hervey. Growing matted among 

 old fronds of Bryopsis; the slender rhizoids characteristic of the 

 species are well developed, and occasionally branch. 



6. C. FLExuosA (Griff.) Harvey, 1846-51, PI. CCCLIII; Collins, 

 1909, p. 339; Conferva flexuosa Griffiths in Wyatt, Alg. Danm., 

 No. 227. Gibbet Island, June, Howe; North Shore, Tucker's Town, 

 April, Inlet, Aug., Collins. A delicate plant but often reaching a 

 length of 2 dm. Late in its season it becomes unattached and may 

 be found in large fioating masses, in Castle Harbor and similar places. 



7. C. EXPANSA (Mert.) Kiitzing, 1853, p. 27, PI. XCIX, fig. 1; 

 Collins, 1909, p. 340; Conferva expansa Mertens in Jiirgens, Algae 

 Aquaticae, Dec. V. Brackish pool between North Shore and Harring- 

 ton Sound, April, Collins. Forming loose floating masses, sometimes 

 pure, sometimes in company with Lyngbya and Enteromorpha. In the 

 latter case the algae form a felted stratum on the surface of the 

 water so firm that the shore birds may be seen in large flocks, walking 

 on it as if it were land, while they pick the small animals living among 

 it. Whether this plant is the same as C. heteronevia Kiitz., as described 

 by Borgesen, 1913, p. 25, may be a question. C. flavescens Harvey, 

 1846-51, PI. CCXCVIII, Collins, 1909, p. 339, is certainly distinct, 

 but we have not found it here; it seems to be a more northern form. 

 Reinbold, 1893, p. 196, considers Conferva expansa of Jiirgens Alg. 

 Aquat. as distinct from Cladophora fracta forma marina, and refers 

 for details to Farlow, 1881, p. 56; but the C. fracta forma marina of 

 Farlow is a plant of much smaller filaments than the Hauck plant of 

 the same name. We have found a plant in Harrington Sound, that 

 could, without violence, pass for a slender form of C. fracta forma 

 marina of Hauck, but it seems to us to fit equally well, if not better, 

 in C. expansa, as we understand it. 



8. C. BEACHYCLONA Montagne in Kiitzing, 1849, p. 394; 1853, 

 p. 27, PI. XCVI, fig. II; Collins, 1909, p. 344. A single specimen 

 from Miss Peniston, without definite locaUty, is the only American 



