Ser. GONGYLOSrERME.E. ( 109 ) Fam. CERAMIACEiE. 



Plate CV. 

 CERAMIUM FLABELLIGERUM.— oT. Ag. 



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

 less of the articulation, pervaded by coloured cells. Fructification of two kinds, on 

 distinct plants : 1. Favellffi, 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 

 Kepa/j-os, "a pitcher ;" but the name is not applicable to the fruit of any species 

 of the genus as now restricted. 



Ceramium flahelligerum. — Fronds ratliei* stout, much branched, the 

 main divisions irregularly dichotomous, flabelliform, gradually attenuated 

 upwards, with short lateral, simple, or forked ramuli ; articulations 

 entirely pervaded by coloiu'ed cells, those of the main branches once 

 and a-half to twice as long as broad, the upper rather shorter, each 

 with a short spine on its outer and upper edge ; favella) " two- to three- 

 lobed," sessile on the upper branchlets, with three to fovu: long patent 

 involucral ramuli ; tetraspores prominent, scarcely immersed in the 

 joints of the upj)er branches. 



Ceramidm flabelligerum. — /. Ag. Advers. 27 ; Harv. B. P. plate 144 ; Harv. Man. 

 p. 165 ; Harv. Syn. p. 135 ; Atlas, plate 52, fig. 238 ; /. G. Agardh, 

 Sp, Gen. Alg. vol. ii. p. 13-i. 



Hab. — Parasitical on the smaller Algse, between tide-marks. Annual. Summer and 

 autumn. Rare ? Torbay {Mrs. Griffiths) ; Jersey {Miss White, Mr. P. P. Girdlestone, 

 Miss Edgar). 



Geogr. Dist.— South of England ; coast of Spain. 



Description. — Fronds densely tufted, two to three inches long, 

 rather stout at the base, gradually attenuated upwards ; the main 

 divisions mostly dichotomous, frequently secund, erect or erecto-patent, 

 somewhat distichous and flabelliform, more or less furnished with shoi-t, 

 simple, or once or rarely twice divided ramuli, attenuated at the 

 base, and somewhat cm-ved ; the apices acuminate, apices of the branches 

 forked, the segments straight or very slightly curved. Articulations 

 of the lower part of the frond once and a-half or twice as long as 

 broad, slightly shorter upwards, those of the forks about as long as 

 broad, entu-ely pervaded by coloured cellules, and having at the upper 

 and outer angle of each a minute coloiu-ed three-jointed spine, slightly 

 contracted at the dissepiments. Substance rather rigid and cartilaginous. 



