106 BI NOrSIS OF BRITISH SFAW ! 



haying deeply-crri fronds, and others comparatively little 



divided. All are however bill pigmies t<> (he Bpeeimens 



collected on the east coast of America, where this -plant is 

 as common as Plocamium coecineum is with us. and to be 

 found as invariably ornamenting (he seaweed pictures mnde 



by fair Bostonians, as the latter is in those manufactured 

 at this side the Atlantic. 



181. ciliata (The ciliated JRhodymenia) ; frond thick, subcarti- 

 laginous, dull purplish-red, rising from a short stalk, lanceo- 

 late or forked, irregularly pinnated with lanceolate or bifid 

 segments, which are attenuated at base; the 1 margin, and 

 often the disc, more or less furnished with subulate cilia, in 

 which the tubercles are imbedded ; tetraspores collected in 

 cloud-like patches dispersed over the disc ; root branching, 

 Grev. Alg. Brit. p. 90. (Atlas, PI. XLI. Fig. 187.) 



Calliblepharis ciliata, Ktz. Delesseria ciliata, Lamovr. Haly- 

 menia ciliata, Gaill. Sphaerococcus ciliatus, Ag. Fucus 

 ciliatus, Linn. 

 Hah. On rocks, in pools near low-water mark, and at a greater 

 depth. Annual. Fruiting in winter. Frequent. 

 Hhodymenia ciliata is of a thicker substance, and more 

 rigid than any other British species of this genus, and is 

 moreover distinguished from all of them, except H. jubata, 

 by the fibrous character of the root. R.juhata, indeed, 

 was long considered to be merely an extraordinary variety 

 of R. ciliata, until characters were satisfactorily ascertained 

 by Mrs. Griffiths, which seem permanent^ to separate it. 

 These consist in a softer substance, a duller colour, and a 

 difference in the fructification, and also in the season at 

 which the plant is in perfection. It is only the smaller 

 and narrower varieties of R. ciliata which can be con- 

 founded with R. jubata. 



182. jubata (The cirrhose Rhodymenia) ; frond thickish, flaccid, 

 subcartilaginous, dull-red, linear-lanceolate, much attenuated 

 or cirrhose at the apex, vaguely pinnate with laciniae of the 

 same form ; the margins, and often the disc, beset with 

 subulate or filiform cilia, in which both tubercles and tetra- 

 spores are produced on distinct plants ; root fibrous, branch- 

 ing, Grev. Alg. Brit. p. 91. (Atlas, PL XLI. Fig. 188.) 



Calliblepharis jubata, Ktz. Sphserococcus jubatus, Grev. S. ci- 

 liatus, var., Ag. Fucus jubatus, Good. andWood. F. ciliatus, 

 var., Turn. 



Hah. On the bottoms of rock-pools between tide-marks, chiefly 



