Ser. GONGYLOSPERMEiE. i H9 ) Fam. CERAMIACEiE. 



CALLITHAMNION FLOCCOSUM.— Jr/. 



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. Favellse, mostly 

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

 tripartite or cruciate. Name from Ka\hs, " beautiful," and dd/xvos, "a shrub." 



Callithamnion Jloccosum. — Frond mucli branched ; branches scattered 

 at very irregular distances, each articulation furnished throughout near 

 its summit with a pair of opposite, simple, minute, subulate ramuli, 

 near the base of which are seated the triparted tetraspores. 



Callithamnion ^occosMm. — Ag. Sp. Alg. vol. ii. p. 158 (excl. syn. Dilhv.) ; 

 Encll. 3rd. Suppl. p. 34 ; Ilarv. P. B. plate 81 ; Harv. Man. p. 172 ; 

 Harv. Syn. p. 144 ; Atlas, plate 57, fig. 263 ; Harv. N. B. A. part 2, 

 p. 240 ; /. G. Agardh, Sp. Gen. Alg. vol. ii. p. 27. 



Callithamnion plumula. — Lyngh. Hyd. Dan. p. 127 (excl. var. ;8). 



Callithamnion Pollexfenii. — Harv. in Ann. Nat. Hist. vol. xiv. p. 18G, t. 5, 

 f. 5—7. 



Conferva floccosa. — Fl. Dan. t. 828. 



Hab. — On submarine mud-covered rocks, near low-water mark, and in intratidal pools 

 on stories. Annual. Spring. Rare. Orkney (Rev. J. H. Pollexfen) ; Aberdeen (Dr. 

 Dickie) ; Forfarshire coast (Mr. A. Croall) ; Peterhead {Mr. T. Bell). 



Geogr. Dist. — North of Scotland ; Coast of Norway. 



Description. — Fronds one to three inches long, much tufted and 

 branched ; branches often very distant below, more closely placed 

 upwards, mostly alternate, erecto-patent, the lower part of the branch 

 often naked more than half-way, the divisions collected near the summit, 

 and frequently curved upwards. Articulations of the main branches two 

 to three or occasionally four times loiiger than broad, each furnished 

 near its summit with a pair of opposite, minute, spine-like ramuli, of 

 about six to eight articulations, arising from a little above the middle of 

 the articulation, which is rather longer than broad. Substance rather 

 flaccid, but not adhering very tenaciously to the paper. ' Colour, a pale 

 rather dull transparent red. Favellse appear not to have been seen in 

 this covmtry. Tetraspores are by no means common ; they arise from 

 the lower articulations of the ramuli, and are very minute, triparted, on 

 very short stalks. 



