140 SYNOPSIS OF BRITISH SEAWEEDS. 



sufficiently distinguish it. It agrees better in thee 

 Bpects with the rare G-. barbata, bul differs in its inflores- 

 cence, it' I may venture to use that term to express 



disposition of fruit. 



211. corallina (The cored-like GfriffUhsia) ; filaments dichoto 

 mous, incrassated, gelatinous; axils patent; joints sw< 

 upwards, pear-shaped, the ultimate ellipsoid; involucres 

 rile, those containing tetraspores whorled round the 

 branch, those containing favelke lateral, Ag. Syn. p. 'Js. 

 ( Atlas, PL LV. Fig. 252.) 

 Callithamnion corallinum, Lyngb. Conferva corallina, Linn. 



C. corallinoides, Linn. C. geniculata, Ellis. 

 Hah. On rocks near low-water mark, generally in deep pools. 

 Annual. Summer. IS^ot uncommon. 

 This is one of those beautiful aud not very uncommon 

 plants which can scarcely fail to attract the notice of the 

 observer who has once made the marine Flora his study. 

 TV e consequently find it among the species which soonest 

 attracted notice. It is one of the few marine Conferva 

 figured by Dillenius, and having a place in the early edi- 

 tions of Linnaeus. The clear red of its glossy, beaded 

 fronds is well expressed in the specific name corallina, 

 bestowed upon it from an early period. It is found in 

 every part of the European waters, from the shores of Ice- 

 land to those of Italy, and I have received specimens 

 from the shores of Van Diemen's Land. 



245. secundiflora {The side-fruited Griffithsia) ; filaments 

 ultra-setaceous, somewhat gelatinous but firm, irregularly 

 dichotomou3, the lesser divisions flabellate ; axils acute ; 

 branchlets fastigiate, obtuse, not tapering to a point ; articu- 

 lations cylindrical, two to four times as long as broad, with 

 a very wide border ; " involucres on very short, lateral 

 peduncles." J. Ag. in Linn. v. 15. p. 39. (Atlas, PI. LIT. 

 Fig. 246.) 

 Griffithsia crassa, Kiitz. G. intermedia, Lenorm. G. corallina, 

 var., Bonn. Ceramium corallinum, var., Desmaz. C. Des- 

 mazieri, Crouan. 

 Hob. Plymouth. On rocks, at extreme low-water mark. Per- 

 ennial ? 

 From G. setacea this plant may, at once, be known by 

 its large size, its comparatively shorter joints, and more 

 lubricous substance; but especially by the very obtuse) 

 cylindrical, upper ramuli, which do not taper to a point, 



