Ser. GONGYLOSPEKME.^.. ( 189 ) Fam. CERAMIACP^iE. 



Plate CXXVIII. 

 CALLITHAMNION COEYMBOSUM.— ^^. 



Gen. Char. — Fronds filiform and articulated, sometimes at length in tlie older parts 

 cellular and partially opaque, single-tubed ; divisions mostly pinnate, dissepiments 

 hyaline. Fructification of two kinds, on distinct plants ; 1. FavelliB, mostly 

 lateral on the branches, and filled with minute spores ; 2. Tetraspores, external, 

 tripartite or cruciate. Name from /caA.bs, "beautiful," and CciiUtos, "a shrub." 



Callitha5[xion corymhomm. — Fronds rather gelatinous, densely tufted, 

 veiy much branched ; branches mostly alternate, capillaceous, ultimate 

 branches subdichotomously flabelliform, ultimate ramuli patent, their 

 apices obtuse ; articulations of the principal branches eight to ten 

 times longer than broad ; tetraspores lateral, opposite the axils of the 

 upper dichotomies. 



Callithamnion corymhosum. — Ac/. S}^. Alg. vol. ii. p. 165; WycUt, Alg. Danm. 

 No. 92 ; Harv. in Hool. Br. Fl. vol. ii. p. 346 ; Harv. in Mack. 

 Fl. Eih. part 3, p. 216 ; Harv. P. B. plate 272 ; Harv. Man. 

 p. 181 ; Harv. Syn. p. 154 ; Atlas, plate 59, fig. 276 ; Harv. N. B. A. 

 part 2, p. 236 ; J. G. Agardh, Sp. Gen. Alg. vol. ii. p. 41. 



Callithamnion versicolor. — Ag. <Sjp. Alg. vol. ii. p. 170; Harv. in Hook. Br. Fl. 

 vol. ii. p. 346 ; Harv. in Mack, Fl, Hib, part 2, p. 165 ; Harv, Alan. 

 1st ed. p. 112, 



Phlebothamnion corymbosum, — Kiltz, Phyc. Tin. p. 375 ; S'p. Alg. p. 657. 



Phlebothamnion versicolor. — Kiits, Phyc. Un. p. 375 ; Sp. Alg. p. 657. 



Ceramium corymbosum. — Ag. Syn. p. 27; Ag. Syst. p. 138. 



Ceramium versicolor. — Ag. Syst. p. 140. 



Conferva corymbosa. — Eng. Bot. i. 2352. 



Hab. — On rochs, stones, old shells, various Algse, and on the leaves of Zostera, near 

 low-water mark. Annual. Summer. Common all round our coasts. 



Geogr. DisT. — Atlantic and Mediterranean coasts of Europe ; east coast of North 

 America. 



Description. — Fronds from a minute disc, densely tufted, two to 

 three inches long, slender and capillary, densely branched ; branches 

 mostly subdichotomous, more regularly so upwards, sometimes the prin- 

 cipal branches are less regularly alternate ; all the divisions are very 

 nearly cylindrical, each subdivision being scarcely half so thick as the 

 one from which it springs, and each composed of a single joint, the 

 apical ones about as broad as long, rather patent, and veiy obtuse, all 



