100 ACOTYLEDONS. ALGJE. Ptllota. 



/3. sedifolius, ramuli between oblong and oval crowded undivided. 



Turn. 

 HAB. Firth of Forth, rather rare, Mr, Greville. (3. Losie-mouth,, 



James Brodie, of Brodie, Esq., abundant. 

 Three to seven inches in length ; of a pale red colour. 



6. Ch. kallfbrmii, frond subgelatinous filiform tubular much and 

 irregularly branched, branches and ramuli generally verticillate 

 contracted as if jointed, tubercles sessile and scattered seeds 

 on the ramuli. Turn. Fucus nalif., Turn. Hist. Fuc. t. 29 

 (bis). E. B. t. 640. F. verticillatus, Ligktf. p. 962. /. 31. 



HAB. Sparingly on the rocks of the little Isles of Jura, Light/. West- 

 ern coast of "Scotland, Mr. Menzies. 



Six inches to a foot or more long. Colour a beautiful pink, very 

 fugitive. 



7. Ch. Opuntia. frond subcylindrical filiform solid here and 

 there contracted as if jointed branched, with a net-work of 

 fibres internally, branches horizontal acuminated, joints lan- 

 ceolate obsolete, tubercles globular very minute scattered. 

 Turn. Fucus Opuntia, Tarn. Hist. Fuc. t. 107. Fucus re^ 

 pens, Ligktf. p. 961. Rivularia Opuntia, E. B. 1. 1868. 



HAB. Rocky shores, common. 



Thickly matted, from half an inch to an inch long. 



8. Ch. pusilla, frond between cartilaginous and horny flat fili- 

 form here and there contracted as if jointed much and irre- 

 gularly branched, ramuli horizontal attenuated at their base 

 dilated and rounded at their apices, very minute globular ses- 

 sile tubercles and scattered seeds upon the ramuli. Turn. 

 Fucus pusillus, Turn. Hist. Fuc. t. 108. 



HAB. Caroline Park, Firth of Forth, Mr. Greville. 



Minute, from half an inch to an inch or more in length, purplish pink. 



9. Ch. articulata, frond cylindrical filiform tubular contracted 

 throughout as if jointed branched, branches of equal height 

 diehotomous and whorled, jointssubcylindrical, tubercles urceo- 

 late sessile and scattered seeds on the ramuli. Turn. . Fucits 

 articulalus, Light/, p. 959. Turn. Hist. Fuc. t. 106. E. B. 

 t. 1574. 



HAB. Marine rocks in Jura, Oransa, Canay, Skye, &c., Lighff. 



Firth of Forth, not uncommon, Mr. Greville, Orkney, Mr. Chas. 



Clans ton. 

 Three to four inches to one foot in length. Colour purplish pink. 



30. PTILOTA. Jg. 



Seeds naked, surrounded by an involucrum. Frond compressed, 

 nerveless, pinnated. Seeds collected into a cluster and inclosed 

 in a setaceous involucrum. 



1. Pt. plurnosa, frond compressed cartilaginous much and irre- 

 gularly branched, branches repeatedly pinnated, ramuli oppo- 



