SYNOPSIS OF BRITISH SEAWEEDS. 



Sub-order 4. Gloiooladiks. Frond loosely gelatinous ; the 



filaments of which if is composed lying apart from one an- 



other, surrounded bu a E&yellidia n»- 



» d. 



LXXIV. Chuobia. Frond crustaceous, skin-like. 



LXXV. Naccabia. Frond filiform, solid, cellular j the ra- 



muli (only) composed of radiating, i'vev filaments. 

 L\\\ 1. GrLOiosiPHONiA. Frond tubular ; the walls com- . 



posed of radiating filaments. 

 LXJLVil. Nemalbon. Frond filiform, solid, elastic; the 

 axis composed of closely packed, vertical filaments ; 

 the periphery of moniliform, free, horizontal filaments. 

 LXXVIII. DuDBESNAIA. Frond filiform, solid, gelatinous; 

 the axis composed of a network of anastomosing ver- 

 tical filaments ; the periphery of moniliform, free, ho- 

 • rizontal filaments. 

 LXXIX. Crouania. Frond iiliform, consisting of a jointed 

 filament (axis), whorled at the joints with minute, mul- 

 tifid, moniliform, free, horizontal filaments (or ramelli). 



Order 13. Ceramiace^e. Hose-red or purple seaweeds, with a 

 filiform frond, consisting of an articulated, branching fila- 

 ment, composed of a single string of cylindrical cells, 

 sometimes coated with a stratum of smaller polygonal cells. 

 Fructification double : 1. Faveltae, berry-like receptacles, 

 ivith a membranous coat, containing numerous angular 

 spores : 2. Tetraspores, attached to the ramuli, or subim- 

 mersed in their substance, scattered. 

 LXXX. Ptilota. Frond compressed, inarticulate, disti- 

 chous, pectinato-pinnate. Favella stalked, involucrate. 

 LXXXI. Microcladia. Frond filiform, inarticulate, di- 



chotomous. Favellce sessile, involucrate. 

 LXXXII. Ceramium. Frond filiform, articulate, dichoto- 

 mous ; the nodes opaque. Favellce sessile, mostly in- 

 volucrate. Tetraspores immersed or subimmersed. 

 LXXXIII. Spyridia. Frond filiform, inarticulate ; the 

 branches clothed with minute, setiform, articulated 

 ramelli. Favellce stalked, involucrate. Tetraspores 

 sessile on the ramelli. 

 LXXXIV. Griffithsia. Frond articulated, dichotomous, 

 or clothed with whorled, dichotomous ramelli. Favt IUb 

 involucrated, sessile, or stalked. Tetraspores sessile 

 on whorled ramelli. 

 LXXXY. Wrangelia. Frond articulated, pinnate. Fa- 



