V. CERAMIACEJ^. 217 



7. C^nAMixm fastigiatum, Harv.; frond capillary, of equal diameter throughout, 

 flaccid, dicliotomous, level-topped ; the axils acute; internodes pellucid, the lower 

 ones nearly colourless, from four to six times as long as broad, the upper succes- 

 sively shorter, and filled with pale rose-coloured endochrome ; nodes banded ; 

 favellaj sub-terminal, involucrated ; tetraspores prominent, secund on the outer edge 

 of the branches. J. Ag. Sp. Alg. 2,/). 119. Harv. Phyc. Brit. t. 255. Gongroce- 

 ras fastigiatwn, Kiitz. Sp. Alg. p. 678. 



Hab. Massachusetts Bay, Br. Durkee, Captain Pike. Greenport, W. H. H. 

 Newport, Prof. Bailey, Mr. Olney^^'c. Longbranch, New Jersey, Miss Morris, (v. v.) 



Tufts very dense, fastigiate, soft. Filaments finer than human hair, many times 

 regularly dichotomous, the lower axils sub-distant, the upper gradually nearer, not 

 widely spreading. Apices of all the branches generally on a level, the ultimate 

 divisions forcipate. Occasionally there are a few lateral ramuli. Internodes pellucid, 

 but suffused with a pale blush, the uppermost ones filled with rosy endochrome. 

 Nodes coated with a definite band of small cells. General colour of the tuft a 

 bright lake-red, becoming in fresh water first scarlet and then orange. 



The American specimens are very similar to those from the South of England 

 and Ireland. 



8. Ceeamium arac7mozc?eMw (?) Ag.; tufts fastigiate, dense ; filaments capillary, 

 attenuated upwards, many times regularly dichotomous ; axils more or less patent, 

 the lower distant, the upper close ; apices forcipate, not strongly inflexed ; inter- 

 nodes pellucid, the lower ones thrice or four times as long as broad (sometimes 

 veiny), upper very short ; favella? lateral, subtended by elongating ramuli (at length 

 axillary); tetraspores bursting from the outer edge of the nodes, especially of the 

 upper branches, solitary or aggregated, very prominent. J. Ag. Sp. Alg. 2,/>. 117- 

 ^ patentissimum ; of small size, the lower furcations distant and very patent ; the 

 branches ending in dlchotomo-raultifid, divaricating, corymboso-fastigiate ramuli ; 

 internodes of the ramuli extremely short. (Tab. XXXIII. B.) 



Hab. Boston Bay, Dr. Durhe, Capt. N. Pike. Newhaven, Mr. J. Hooper. Bay- 

 side, New York Bay, Mr. J. Hooper. Hellgate, Mr. Walters. Var. ^, Boston Bay, 

 Dr. Durkee and Capt. N. Pike. New York Harbour, Mr. Walters and Mr. Hooper. 

 (v. s. in Herb. T. C. D.) 



Fronds very dense, one to two inches in diameter, fastigiate. Filaments rather 

 thicker than human hair below, attenuated to the extremity, many times regularly 

 dichotomous, the lower forks distant and rather patent, the upper successively closer 

 and (except in var. /3) more erect ; the apices forked and slightly forcipate, sub- 

 obtuse. Nodes coated with a band of cells, not swollen, sometimes constricted ; 

 lower internodes hyaline or occasionally striated with coloured, cobweb-like 

 filaments which run through the walls, now and then anastomosing ; upper inter- 



VOL. IV. — ART 5. ^ ^ 



