80 BYKOF8I8 OF BRITISH SEAWEEDS. 



129. byssoides (The bynoid Polytvphonia)] stems rigid, seta- 

 ceous, cartilaginous, distichous!} branched, decomposito-pin- 

 nate ; branches putrnt, more op Less densely clothed with 

 Bhort, slender, dichotomous, Bingle-tubed, byssoid ramelli ; 

 articulations of the Btem variable in length, 3-4-striatc, Grev. 

 Ft. Edin.p. 309. (Atlas, PL XXX Pig. 131.) 



Hutchinsia byssoides, .4^. Conferva byssoides, Eng.Bot. Cera- 



mium molle, Roth. Fucus byssoides, Good, et Woodw. 

 Ilab. On stones and shells, and various Alga?, near low- water 

 mark, and in 4-5-fathoms water. 

 One of the handsomest of the British species of this ex- 

 tensive genus, especially when young, at which period the 

 whole plant is of the softest substance and most delicate 

 rosy-red colour.' In some respects this species connects 

 the genera Polysiplionia and Dasya, for here, although 

 the tetrasporic fruit is altogether that of a true Polysi- 

 phonia, the habit of the frond is that of Dasya ; the byssoid 

 ramelli of this species being identical with those found in 

 the Dasya?. These ramelli appear to be also of the same 

 nature as the fibres found terminating the young branches 

 of other JPolysiphonice, as well as Rhodomelce, etc.. and are 

 probably to be regarded as leaves in a very imperfect state 

 of development. 



XLI. DASYA. 



130. coccinea {The scarlet Dasya)-, stems elongate, robust, 

 rough with hair-like fibres, distich ously branched ; branches 

 bi-tripinnate ; pinnulse multifid, single-tubed, their articu 

 lations as long as broad, Ag. Spec. Alg. v. 2. p. 119 

 (Atlas, PI. XXX. Fig. 135.) 



Asperocaulon coceineum, Grev. Ellisius coccineus, Gray. Tri- 

 chothamnion coceineum, Kutz. Hutchinsia coccinea, Ag, 

 Callitliamnion coceineum, Lyngb. Conferva coccinea, Huds. 

 C. plumosa, Ellis. Ceramium hirsutum, Roth. C. patens, 

 Grev. 

 Hob. On rocks and Algse near low-water mark ; £. dredged in 

 deep water. Annual. Summer. 

 A well-known plant, common along the coasts of Europe, 

 and a great favourite with collectors of Seaweeds for orna- 

 mental purposes. By dredging in sandy bays and among 

 Nullipores a complete series of forms, connecting the most 

 luxuriant with the most lank, may be collected. Those 

 from deep water are generally very irregularly branched, 

 and seldom produce fruit. Specimens having stichidia are 



