Ser. GONGYLOSPERME^. ( 103 ) Fam. CERAMIACEyE. 



Plate CIII. 

 CEKAMIUM STRICTUM.— A^Mfe. 



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

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

 distinct plants : 1. Favellse, roundish, with a pellucid liml)us, 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/xos, "a pitcher ;" but the name is not applicable to the fruit of any species 

 of the genus as now restricted. 



Ceramium st7nctimi. — Frond cylindi'ical, much branched from the base ; 

 main divisions dichotomous, long and very slender, straight and erect, 

 all of nearly equal diameter throughout ; apices forked, slightly in- 

 curved ; articulations, towards the middle, three to four times longer 

 than broad, rather shorter upwards, those of the apices about twice 

 as bi'oad as long ; favellai lateral, near the apices, involucrate ; tetra- 

 spores whorled round the dissepiments, prominent. 



Ceramium strictum. — Harv. P. B. plate 334 ; Harv. Man. p. 1G3 ; Harv. Sjfn. 

 p. 134 ; Atlas, plate 51, fig. 233 ; /. G. Agardh, Sp. Gen. Alg. 

 vol. ii. p. 123. 



GoNGROCEKAS strictum. — Kiltz. in Linn. 1842, p. 735 ; Phyc. Gen. p. 380 ; 

 Sp. Alg. p. 678. 



Hab, — On shells, corallines, &c. in tide-pools, near low-water mark. Torquay {Mrs. 

 Griffiths) ; Penzance {Mr. RaJfs) ; Plymouth {Mr. Boswarva and Dr. Cocks) ; Jersey 

 {Miss Turner) ; Dingle, Kerry {Dr. Harvey) ; Koundstone {M'Calla). 



Geogr. Dist. — German Ocean {Kniz.). 



Description. — Root, a small disc, with minute fibres. Frond densely 

 tufted, two to fom' inches long, extremely slender and cylindrical ; main 

 branches dichotomous, all of nearly eqiial diameter, without lateral 

 ramuli, except here and there a short, simple, spine-like branchlet, long, 

 erect, and straight ; apices forked, straight, or slightly incurved ; articu- 

 lations, towards the middle, three to four times longer than broad, 

 slightly shorter upwards, those of the ultimate ramuli very short, almost 

 approximate, the dissepiments slightly swollen, those near the summit 

 frequently copiously furaished, especially when young, with long, slender, 

 flexible, pellucid hairs. Substance rather soft and flaccid, but very 

 imperfectly adhering to paper. Colour, a fine purplish red, white in 

 decay, when dry beautifully membranous and glossy. Favellre lateral 



