Ser. GONGYLOSPERME.E. (1/9) Fam. CERAMIACEvE. 



Plate CXXVI. 

 CALLITHAMNION BORRERI.— ^f7- 



Gem. Char. — Fronds filiform and 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. Favellse, mostly 

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

 tripartite or cruciate. Name from Ka\hs, " beautiful," and 6d.p.vus, "a shrub." 



Callithamnion Borreri. — Frond much tufted and branched ; branches 

 mostly distichous, regularly piunated with alternate plumules, the lower 

 half of which is naked, the upper simply pinnate, with alternate pinnae, 

 those next the base longest. Articulations of the branches two to 

 five times as long as broad, those of the pinnae neai'ly twice as long as 

 broad. 



Callithamnion Borreri. — Ag. Sp. Alg. vol. ii. p. 170; Endl. 3rd Suppl. p. 34 

 Kiitz. Phyc. Gen. p. 372 ; Harv. in Hook. Br. Fl. vol. ii. p. 344 

 Harv. P. B. plate 159 ; Harv. Man. p. 179; Harv. Syn. p. 151 

 Atlas, plate 59, fig. 272 ; Harv. N. B. A. part 2, p. 233 ; /. G. Agardh, 

 Sp. Gen. Alfj, vol. ii. p. 49. 



Callithamnion seminudum.—Ag. Bot. Zeit. 1S27, p. 637 ; Ag. Sp. Alg. vol. ii. 

 p. 167 ; Harv. in Hooh. Br. Fl. vol. ii. p. 344 ; Wyatt, Alg. Damn. 

 No. 187 ; J. Ag. Alg. Medit. p. 72 ; Endl. 3rd Suppl. p. 34. 



CERAMiuii pinnulatum. — Ag. Syst. p. 139. 



Ceramiuu miniatum, — Ag. Syst. p. 141. 



Conferva Borreri. — Sin. E. Bot. t. 1741. 



Hab. — On mud-covered rocks near low-water mark. Annual. Summer. South or 

 England and east of Ireland, Common. Yarmouth {Mr. Borrer). 



GEoaR. DisT. — Atlantic shores of France and Spain ; Mediterranean and Adriatic Seas. 



Description. — Fronds densely tufted, one to three inches long or 

 more, very slender and capillary, much branched ; the branches alternate, 

 subdistichous, rather long and slender, naked below, the upper part 

 repeatedly pinnate in a distichous, alternate manner, the ultimate ramuli 

 plumose, naked in their lower part, the upper part from one to two- 

 thirds of their length regularly and alternately pinnate ; pinnae next 

 the base long, tapering to a point, crecto-patent, the apical ones very 

 short, tooth-like. Articulations of the stem thi'ee to five times lono-er 

 than broad, of the pinnae once and a-half or twice as long as broad, 

 cylindrical, scarcely contracted at the dissej)iments ; lower part of the 



