Ser. GONGYLOSPEKME/E. ( 145 ) Fam. CERAMIACEJS. 



Plate CXVIII. 

 CALLITHAMNION TLVMVLA.—Li/iujh. 



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 KaXhs, "beautiful," and Oafwos, "a shrub." 



Callithamnion phimxila. — Fronds disticlions, subdichotomous, each 

 articulation bearing at its summit a pair of short recurved pinnae, bipec- 

 tinated on their upper edge. 



Callithamnion jylumula. — Lyngh. Hyd. Dan. p. 127; Ag.Sp.Alg. vol. ii. p. 159; 

 Wyatt, Alff. Danm. No. 138 ; Endl. 3rd Suppl. p. 34 ; Hooh. fil. Fl. 

 Antarct. vol. ii. p. 489 ; /. Ag. Alg. Medit. p. 71 ; Kiitz. Pkijc. Gen. 

 p. 372 ; Harv. in Hooh. Br. Fl. vol. ii. p. 339 ; Harv. in Mack. Fl. 

 Bib. part 3, p. 213 ; Harv. P. B. plate 242 ; Harv. Man. p. 171 ; 

 Harv. Syn. p. 142 ; Atlas, plate 55, tig. 254 ; /. G. Agardh, Sp. Gen. 

 Alg. vol. ii. p. 29. 



Ce-rahivm pi umula. — Ag. Syn. p. 62; Ag. Sysf. p. 142. 



Conferva plumula. — Ellis, Phil. Trans, vol. Ivii. t. 18 ; Dillw. t. 50. 



Conferva Turneri. — ;SV?i. E. Bot. t. 1637, not 2339. 



Hab. — On rocks, stones, shells, and Algre, near low- water mark, and in three to 

 eighteen fathoms water. Annual. Summer. Common all round our coasts. 



Geogr. Dist. — Atlantic shores of Europe, and North America ; Mediterranean Sea ; 

 Cape Horn {Dr. Hooker) ; Tasmania {Gunn). 



Description, — Root, a minute disc. Fronds densely tufted, two to 

 four or six inches in length, capillaceous, branched ; branches distichous, 

 mostly dichotomous, sometimes alternate or secund. Stem and branches 

 pellucid throughout, and every articulation bearing near its summit a 

 pair of opposite, short, patent and generally recurved pinnae, twice or 

 even in luxuriant specimens three times pectinated on their upper edge ; 

 the pinnules erecto-patent, those at the base longest, gradually becoming 

 shorter upwards, and slightly curved. In very luxuriant specimens, the 

 joints are frequently fiu-nished with an additional pair of pinnae at right 

 angles to the others. Substance veiy flaccid, and adhering very closely 

 to the paper in drying. Colour, a fine rich carmine when fresh, becoming 

 dull brownish yellow in decay. Favellao clustered, terminal on short, 



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