Ser. GONGYLOSPERME^. ( ir<^ ) Fam. CElUMIACEJi:. 



CALLITHAMNION BARBATUM.— y/^. 



Gen. Guar. — Frouds filiform and articulated, Bometirues at length iu tlie older parts 

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

 hyaline. Fructification of two kinds, on distinct plants : 1. Favella3, mostly 

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

 tripartite or cruciate. Name from Ka\hs, "beautiful," and Qajxvos, " a shrub." 



CallithaMxion barhatum. — " Stems (rising from creeping filaments 1) 

 much and irregularly branched ; branches mostly alternate, lung, sub- 

 simple, naked or piunulated, with minute, opposite, spiue-like, erecto- 

 pateut ramuli ; articulations twice or thrice as long as broad j tetra- 

 spores elliptic oblong, witli a wide limbus, sessile on the sides of the 

 pinnulse." — Phi/c. Brit. 



Callithamnion larbaium. — Ag. Si/st. Alt/, vol. ii. p. 181 ; /. Ag, Alg. Medit. 

 p. 70; Endl. 3rd Suppl. p. 34 ; E. Bot. Suppl. t. 2889 ; Harv. P. B. 

 plate 165 ; Harv. Man. p. 173 ; Harv, Syn. p. 144 ; Atlas, plate 5G, 

 fig. 256 ; /. G. Agardh, Si^. Gen. Alg. vol, ii. p. 22. 



CalIiIthamnion Ralfsii. — Harv. ia Herb. (1838). 



Hab. — On mud-covered rocks in the sea. Yery rare. Perennial ? Ilfracombe and 

 on the quay at Penzance (i/r. Ealfs, 1888) ; Dredged at Weymouth {Bev. M. J. 

 Berkeley). 



Geogr. DlST. — MediteiTanean Sea. 



DesceIption. — "Filaments forming intricate tufts, densely matted 

 together at base by creeping fibres, and difficult to disentangle, one to 

 two inches high, much and irregulai-ly branched ; branches alternate or 

 opposite, erect, long, simple, or bearing others similar to themselves, 

 their upper half closely pinnulated with yery short, opposite, spine-like, 

 erecto-patent ramuli ; their lower part either naked or irregularly pin- 

 nulated with similar ramuli. Articulations cylindrical, twice or thrice as 

 long as broad. Tetraspores elliptic oblong, with a very wide limbus, borne 

 on the sides of the ramuli, sessile, mostly solitary. Favellaj unknown. 

 Substance membranous and somewhat rigid, imperfectly adhering to 

 paper. Colour, a dull brownish red, without gloss." — Phyc. Brit. 



This species we have never seen, and only know it by the descriptions 

 of authors. 



In its less perfectly developed form it seems much to resemble the 

 naked battered stems of some other species, being then almost destitute 



