162 CERAMIUM. 



lateral branchlets, destitute of involucral ramuli. Harv. 

 Phyc. Brit. t. ccxv. 



On rocks and Algae, between tide-marks. Annual. Summer. Preston 

 rocks, Torquay, Miss Amelia E. Griffiths ; Ardrossan, Rev. D. Landsbo- 

 rough. Stems sharply hooked or curved at the base. A smaller plant than 

 the preceding, with the apices of the branches straight; the ramuli very 

 numerous, and above all, the favellse heaped together like clusters of small 

 shot. Colour a lurid purplish red, often fading to green and yellow. 



Sections. DIAPHANA. Smooth; the surface of the articu- 

 lation either altogether denuded, or but partially covered 

 with coloured cellules, leaving a colourless space in the 

 centre. 



3. C. decurrens, Kiitz.; frond robust, gradually attenuated 

 upwards, dichotomous, with few lateral branchlets, the apices 

 hooked inwards ; articulations partially coated with coloured 

 cellules which extend from the dissepiment at each end, but 

 leave a colourless, pellucid space in the centre of the articu- 

 lation ; lowermost articulations twice as long as broad, upper 

 very short. Harv. Phyc. Brit. t. cclxxvi. 



On rocks, in tide pools. Annual. August. Torquay, on the Harbrick, 

 Mrs. Griffiths. Filaments thicker than hogs' bristles, 6 8 inches long, 

 gradually attenuated, distantly forked, naked or furnished with a few 

 scattered ramuli. Articulations somewhat monilifonn, pellucid in the 

 middle, but coated with coloured cells for a considerable space at each 

 end. This plant seems almost exactly intermediate between C. rubrum 

 and C. diaphanum. It has the size, and general habit of the former, but 

 the partially hyaline articulations connect it with the latter. I have not 

 seen any fructification. A specimen which I communicated to Professor 

 Kulzing was returned to me by that author, named C. decurrens, ft. majus, 

 Kiitz. 



4. C. Deslongchampii, Chauv. ; filaments subsetaceous, 

 attenuated upwards, rigid, irregularly dichotomous, with or 

 without lateral ramuli ; the apices straight, spreading ; arti- 

 culations colourless, those of the main stems about thrice as 

 long as broad, of the branches and ramuli much shorter ; 

 dissepiments opake, scarcely swollen ; ietraspores whorled 

 round the joints, prominent ; favellae heaped together, burst- 

 ing irregularly from the sides of the branches destitute of in- 



,volucral ramuli. Harv. Phyc. Brit. t. ccxix. ; Wyatt, Alg. 

 Damn. No. 218. Cer. Agardhianum, Griff, in Harv. Man. 

 ed. i. p. 99. 



On rocks in the sea, between tide-marks. Stems 3 or 4 inches high, 

 much branched in an irregularly dichotomous manner, the branches more or 

 less furnished with simple or forked, slender ramuli, about one-third the 



