102 COLLINS AND HERVEY. 



collections that cannot be placed under any of them, and to which 

 we do not venture to give names. Kjellman, 1900, gives full descrip- 

 tions of many species founded by him on material in Scandinavian 

 herbaria, but without descriptions of older species, and with little 

 indication of the distinguishing characteristics between the latter and 

 his new species. Howe, 1917, shows that in one case what Kjellman 

 considers as two sections of the genus are really sexual and asexual 

 forms of the same species. Beside the five species listed below, we 

 can only say that we have also forms resembling G. fasciculata Kjellm., 

 G. ramulosa Kjellm., and G. fruticulosa Kjellm. ]Moseley reports 

 G. rugosa and G. lapidescens, from both of which species, as formerly 

 understood, Kjellman segregated new species. Rein reports G. fas- 

 iigiata, but we have not been able to see a specimen. 



G. FLAGELLiFORMis Kjellman, 1900, p. 47, PL III, figs. 2-11; PI. 

 XX, fig. 16; Borgesen, 1916, p. 93, figs. 99-101. Castle Island, Feb., 

 Hervey. 



G. SQUALiDA Kjellman, 1900, p. 55, PI. VI, figs. 1-12; PI. XX, fig. 9; 

 Borgesen, 1916, p. 102, figs. 108-111; P. B.-A., No. 1882. Harris 

 Bay and other points on the South Shore, at all seasons. In pools 

 from half tide to low water, in dense tufts or often a much branched 

 individual plant, about 10 cm. high, varying much in smoothness, 

 firmness, and in density of branching; a favorite host for many species 

 of small algae. 



G. CYLiNDRiCA (Ell. & Sol.) Lamouroux, 1821, p. 22, PI. XXII, 

 fig. 4; Kjellman, 1900, p. 64, PI. VIII, figs. 34-42; PI. XX, fig. 53; 

 Borgesen, 1916, p. 106; CoralUna cylindrica Ellis & Solander, 1786, 

 p. 114, PI. XXII, fig. 4. Miss Wilkinson, a single specimen, without 

 exact locality. 



G. MARGiNATA (Ell. & Sol.) Lamouroux, 1816, p. 264; Kjellman, 

 1900, p. 77, PI. XX, fig. 44; Borgesen, 1916, p. 106, figs. 115-117; 

 CoralUna marginata Ellis & Solander, 1786, p. 115, PI. XX, fig. 6; 

 Brachycladia marginata P. B.-A., No. 1930. Near low water mark. 

 Gravelly Bay, Jan., Hervey; at and below low water mark, Cooper's 

 Island, Aug., Collins. 



G. OBTUSATA (Ell. & Sol.) Lamouroux, 1816, p. 262; Kjellman, 

 1900, p. 88; P. B.-A., No. 1881; CoralUna obtusata Ellis & Solander, 

 1876, p. 113, PI. XXII, fig. 2. Faxon; Tucker's Town, Feb., Dec; 

 Walsingham, April, Hervey. Varies much in amount of calcification, 

 which sometimes is entirel^' lacking. Usually there is not a gradual 

 diminution of the amount of calcification, often the lower part of a 

 frond is thickly calcified, this part sharply marked off from the upper 

 part, quite uncaicified. 



