THE ALGAE OF BERMUDA. 143 



Ceramium aculeatum Schimper in Decaisne, 1841, p. 179. Kemp; 

 Merriman; Harris Bay, Nov., Harrington Sound, Aug., Hervey. 

 Tetraspores in Nov. 



Var. BERKELEYANA (Mont.) J. G. Agardh, 1876, p. 272; S. Berke- 

 leyana Montagne, 1846, p. 141, PI. XV, fig. 8. Dense tufts on ex- 

 posed flat rocks at low water, Gravelly Bay, April, Collins, with 

 tetraspores. In this variety the recurved prickles characteristic of 

 the species are usually present, but may sometimes be lacking, in 

 which case it approaches S. filamentosa. 



Var. HYPNEOIDES J. G. Agardh, 1876, p. 272; P. B.-A., No. 1946. 

 Castle Harbor, near Walsingham House, April, Harris Bay, March, 

 April, Hervey; tetraspores in collections of both months. The 

 hooked tips of some of the branches, similar to those of Hypnea 

 musciformis, characterize this form. The specimen marked C. 

 aculcata in the Kemp herbarium belongs to this variety. 



3. S. COMPLANATA J. G. Agardh, 1851, p. 343; 1876, p. 271; P. B.- 

 A., No. 1947. Harris Bay, Jan., Feb., April, Pink Bay, March, 

 Hervey; Hungry Bay, Nov., Elbow Bay, Dec., Collins. Growing in 

 dense tufts on flat rocks near low water. 



CERAMIUM Agardh. 



1. Corti cation continuous. 2. 



1. Cortication at nodes only. 3. 



2. Corticating cells in longitudinal series. 5. C. clavulatum. 



2. Corticating cells not in series. 4. C. nitens. 



3. Main axis creeping, attached by rhizoids. 4. 



3. Main axis erect. 1. C. tenuissimum. 



4. Tetraspores cruciate. 2. C. cruciatum. 



4. Tetraspores tripartite. 3. C. transversale. 



1. C. TENUISSIMUM (Lyng.) J. G. Agardh, 1851, p. 120; 1876, p. 

 94; P. B.-A., No. 1898. C. diaphanum var. tenuissimum Lyngbye, 

 1819, p. 120, PL XXXVII. B, fig. 4; C. nodosum Harvey, 1846-51, 

 PL XC. Miss Peniston; Harrington Sound, March, Wadsworth; 

 Harris Bay, Jan., Heron Bay, March, Harrington Sound, April, 

 Hervey; Hungry Bay, May, Fairyland, Dec., floating, Collins. This 

 is the plant that passes by this name on the New England coast, and 

 also Miss Vickers Algues de la Barbade, No. 199; it does not have 

 the reniform cells considered characteristic of C. tenuissimum by 

 Petersen, 1908, p. 54, PL III; but in the present uncertainty of specific 

 limitations in Ceramium, it had better retain the present name. No 

 fruit of any kind has been observed by us. 



