Ser. GOXGYLOSrElJMEiE. ( 105 ) Fam. CERAMIACE.E. 



Plate CIV. 

 CERAMIUM NODOSUM.— (?>vj. et Harv. 



Gen. Char. — Frond filiform, single-tubed, articulated ; joints, and occasionally more or 

 less of tbe articulation, pervaded by coloured cells. Fructification of two kinds, ou 

 distinct plants : 1. Favelte, roundish, with a pellucid limbus, and generally sur- 

 rounded at the base by an involucre of few short articulated spine-like ramuli ; 

 2. Tetraspores, more or less immersed in the ultimate ramuli. Name from 

 K^pafios, "a pitcher ;" but the name is not applicable to the fruit of any species 

 of the genus as now restricted. 



Ceramium nodosum. — Frond rather rigid and brittle, extremely 

 slender, and branched ; branches irregularly dichotomous, often secund, 

 and very patent, all of nearly equal diameter throughout ; articulations, 

 towards the middle, four to five times longer than broad, somewhat 

 shorter upwards, those of forks very short ; favellse terminal on short 

 lateral ramuli ; tetraspores " eiaimpent from the outer edge of short 

 accessory ramuli." 



Ceramium nodosum. — Harv. P. B. plate 90 ; Harv. Man. p. 164 ; Harv. Syn. 

 p. 134; Atlas, plate 51, fig. 234; /. G. Agardh, Sp. Gen. Ahj. 

 vol. ii. p. 121, 



HoRMOCERAS nodosum. — Kiltz. in Linn. vol. xv. (1841) p. 732 ; K-iitz. Plujc. Gen. 

 p. 378, t. 45, fig. 1-7. 



Ceramium diaplianum, rigid variety. — Wyatt, Alg. Danm. No. 217. 



Ceramium rigidulum. — Griff. <£■ Harv. in He7'b. 



Ceramium, new species. — M'Calla, Alg. Hib. vol. i. No. 43. 



Hab. — On sandy shores, frequently at the roots of Zostera. Not uncommon. 



Geogr. Dist. — Mediterranean Sea {Kiitz.) ; New York {Prof. BaiJcij) ; Tasmania 

 {Gunn). 



Description. — Fronds densely tufted, two to four inches in length, 

 very slender, capillaceo-multifid, all the divisions of nearly equal diameter 

 and veiy patent, more or less regularly dichotomous ; apices forked and 

 incurved. Ai-ticulations towards the middle four to five times longer 

 than broad, of the ultimate branchlets veiy short ; dissepiments slightly 

 swollen, those of the forks closely approximate. Substance rather " rigid 

 and harsh to the touch when recent, soon becoming flaccid," adhering 

 rather imperfectly to paper in di-ying. Coloiu", a rather pale brownish 

 red. Favellaj terminal on short lateral proper branchlets, with one or 



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