See. GONGYLOSPERMEi-E. ( 171 ) Fam. CERAMIACEiE. 



Plate CXXV. 

 CALLITHAMNION KOSEUM.— Xy^r/S. 



Gen. Char. — Fronds filiform aud articulated, sometimes at length in the older parts 

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

 hyaline. Fructification of two kinds, on distinct plants : 1. Favelloe, mostly 

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

 tripartite or cruciate. Name from /coAbs, " beautiful," and fla/ij/os, "a shrub." 



Callithamnion roseum. — Fronds slender, opaque at the base, much 

 branched ; branches distichous, irregularly alternate, ultimate branchlets 

 pinnate or bipinnate, long and tapering ; articulations fotu* to five times 

 as long as broad below, and obscm'ed by veins, above much shorter and 

 transpai-ent ; favellte clustered near the apices of the pinnse ; tetraspores 

 numerous on the upper edge of the pinnae. 



Callithamnion roseum. — Lyngh. Hyd. Dan. p. 126, t. 39 ; Ag. Sp. Alg. vol. ii. 

 p. 164; Wyatt, Alg. Damn. No. 44; Endl. 3rd Suppl. p. 34 ; Harv. 

 in Hooh. Br. Fl. vol. ii. p. 341 ; Harv. in Mack. Fl. Rib. part 3, 

 p. 214; Harv. P. B. plate 230; Harv. Man, p. 177; Barv. Syn. 

 p. 149; Atlas, plate 56, fig. 260; /. G. Agard/i, Sjh Gen. Alg. 

 vol. ii. p. 36. 



Phlebothamnion roseum. — Kiltz. Phyc. Gen. p. 375, t. 44, f. 1. 



Ceramium roseum. — Roth, Cat. Bat. vol. iii. p. 145 ; Ag. Sysi. p. 139. 



Conferva rosea. — E. Bot. t. 966. 



Hab. — On rocks and the larger Algse in sestuaries or muddy places near low- water 

 mark. Annual. Summer. Common. 



Geogr. Dist. — Atlantic shores of Europe. 



Description. — Root, a minute disc, when old often covered by fibres. 

 Stems rather slender, two to four inches long, tapering upwards, opaque 

 at the base, filled with veins when old, and sometimes more or less 

 covered with short branching pile, miich branched from the base ; 

 branches erecto-patent, once or twice again divided in a subdistichous 

 and alternate manner, regularly pinnated upwards ; pinnae and. pinnules 

 long, slender, rather distant, one from the apex of each articulation, 

 tapering from the base to the point, the rachides flexuose, pinnules 

 incurved. Articulations nearly cylindrical, or slightly contracted towards 

 the middle, below four to six times as long as broad, and more or less 

 filled with veins which arise from the bases of the branches, and descend 

 spirally downwards, rendering the articulations more or less opaque ; in 



