Ser. GONGYLOSPERME.E. ( 177 ) Fam. CERAMIACEiE. 



CALLITHAMNION FASCICULATUM.-i/am 



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 brauches, and filled with minute spores ; 2. Tetraspores, external, 

 tripartite or cruciate. Name from KaAbs, " beautiful," and eo^ros, "a shrub." 



Callithamnion fasciculatum. — " Tufted ; branches erect, flexuous and 

 level topped ; plumules elongate, erect, lineai'-obovate, truncate ; pinnae 

 long and flexuous, the lowermost simple, appressed, the upper erecto- 

 patent, branching toward the tip ; articulations of the branches veiny, 

 thrice as long as broad, of the pinnse once or twice as long as broad, 

 with contracted dissepiments." — Phyc. Brit. 



CALLiTHAyi^ios fasciculaf am. — Ilarv. in Hook. Br. Fl. vol. ii. p. 343; Uarv. P. B. 

 plate 30S ; Ilarv. Man. p. 179 ; Harv. Syn. p. 151 ; Atlas, plate 58, 

 fig. 271 ; Kiitz, Sp. Alg. p. 652; /. G. Agardh, Sp. Gen. AUj. 

 vol. ii. p. 49. 



Hab. — At Yarmouth [Mr. Borrer). In Herb. Hooker. 



Geogr. Dist. ? 



Description. — Fronds much tufted, nearly naked below and very 

 slender and capillary, much branched and bushy upwards, the apices of 

 the branches looking, to the naked eye, as if truncated or corymbose ; 

 branches long and slender, somewhat flexuose, erect, and cylindrical, 

 their upper half closely plumulate ; plumules long with a linear spathu- 

 late or linear obovate outline, the pinnae of the lower half quite simple, 

 erect and cylindrical, their apices acute, those of the upper part naked 

 for the lower two-thirds of their length ; the rest is regularly pinnate or 

 bipinnate. Articulations of the main branches three to four times as 

 long as broad ; those of the pinnules a little longer than broad, constricted 

 at the dissepiments, those of the stems more or less filled with jointed 

 fibres, but scarcely obscuring the articulations. Favellaj unknown. 

 Tetraspores elliptical, mostly solitary near the base of the pinnules. 

 Substance rather flaccid, closely adhering to paper. Colour, a fine 

 purplish red. 



Of this curious and apparently unique species, we know nothing 

 beyond what has been written of its characters from the solitary speci- 

 men picked up on the shore at Yarmouth by Mr. Borrer, and preserved 



VOL. II. A A 



