Ser. GONGYLOSPERME.E. (165) Fam. CERAMIACK/E. 



Plate CXXTI. 

 CALLITHAMNION BUACIilATTJM.—BonnenL 



Gen. 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. Favellffi, mostly 

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

 tripartite or cruciate. Name from /caAJiy, " beautiful," and etJ^uj/oy, "a shrub." 



Callithamnion hrachiatiim. — " Outline of the frond lanceolate ; stem 

 cai'tilaginous, subsimple, setaceous, somewhat opaque, veiny, set with 

 subquadrifarious, lateral branches, often fiu-nished with a second series, 

 penultimate; branches pellucidly jointed, slender, elongate, set with short 

 alternate, very erect, level topped plumides, the lowermost of which are 

 most simple ; ramuli erect, subidate, not narrowed at the base, gradually 

 tapering to a fine point, their articulations twice as long as broad, cylin- 

 drical ; tetraspores minute, oval, near the tips of the ramuli." 



Callithamnion hracMatum. — Bonnem. (sec. Lenorm. in Herb.) ; Harv. P. B. 

 plate 137 ; Harv. Man. p. 175 ; Harv. Syn. p. 147 ; Atlas, plate 56, 

 fig. 258. 



Callithamnion hirtum, var. ;3. — /. G. Agardh, Sp. Gen. Alg. vol. ii. p. 54. 



Callithamnion Harveyanum. — /. Ag. in Linn. vol. xv. p. 45 ; Endl. 3rd Suppl. 

 p. 34. 



Callithamnion granulattim. — Harv. in Hook. Br. Fl. vol. ii. p. 334 (not of 

 Agardh) ; Harv. in Mach. Fl. Hib. part 3, p. 215. 



Hab. — Parasitical on the Laminarice, &c. Not uncommon. 



Geogb. Dist. — Atlantic shores of Europe. 



Description. — Root, a minute conical disc. Fronds rather stout at 

 the base, tapering upwards to a fine point, tufted, one and a-half to 

 three inches long or more. Stem perciurent, beset almost from the base 

 with subquadrifarious or scattered, erecto-patent branches, those near the 

 base longest, giving the frond an acutely ovate or somewhat lanceolate 

 outline; these are either simple or, in very luxmiant specimens, furnished 

 with a second or rarely and partially even with a third series of similar 

 branches, and these produced at the apex of every joint with a short 

 corymbose plumule, consisting at the base of a simple spine-like ramulus, 

 upwards of from three to six, which arc erect, somewhat incurved, 

 thickest at the base, and gradually taper to a fine point, the dissepi- 



