96 SYNOPSIS OF BRITISn SEAWEEDS. 



colour or the elegance of its form, is entitled to high rank 

 in the oceanic Flora, and, notwithstanding its common 

 occurrence on all our shores, is never seen without at- 

 tracting admiration. In favourable localities it reaches to 



a very Large size, and such specimens are among the most 

 beautiful vegetable objects in nature. 



164. simiosa (The sinuous Delesseria) ; stem elongated and 

 branched, beset with oblong or obovate, deeply-sinuated or 

 pinnatifid, toothed, transversely-ribbed loaves, Lamour. Ess. 

 p. 124. (Atlas, PI. XXXVII. Fig. 170.) 



Wormskioldia sinuosa, Spreng. Fucus sinuosus, Good, and 

 Woodw. F. crenatus, Gm. F. rubens, Muds. F. roseus, Fl. 

 Dan. F. Palmetta, var., Esper. 

 Hah. Parasitical on the stems of Laminaria digitata ; also at- 

 tached to various substances in deep water. Perennial. 

 Summer and autumn. 

 Next to D. sanguined this, when well grown and of 

 large size, is one of the handsomest of the genus. Our 

 plate represents the frond in rather a young state, a speci- 

 men having been chosen for figuring which exhibits the 

 changes that take place in form during the growth of the 

 frond. At first the plant consists of a simple, penninerved 

 leaf, sinuated at the margins. The sinuosities gradually 

 deepen into lateral lobes ; and these lobes, as is shown in 

 the lower part of the figure, deepen into branches, or new 

 fronds, at first sinuous, then lobed, and at length divided 

 like the fronds from which they grow. Thus, eventually, 

 a much branched and leafy frond results from the original 

 leaf, by regular growth and subdivision of the margin. 

 "When any vigorous part is wounded, an irregular, proli- 

 ferous growth likewise takes place, new leaflets springing 

 from any part of the midrib. Sometimes the margin is 

 much laciniated. 



165. alata (The winged Delesseria) ; stem dichotomous, much 

 branched, winged throughout with a narrow, membranous 

 lamina which is pennate-nerved ; tubercles rising from the 

 midrib ; tetraspores in sori occupying the apices of the frond, 

 or in proliferous leaflets, Lamour. Ess. p. 124. (Atlas, PI. 

 XXXVII. Fig. 171.) 



Wormskioldia alata, Spreng. Hypoglossum alatmn, Ktz. Fucus 



alatus, Huds. 

 Hah. Atlantic shores of Europe. On rocks and the larger Algse, 



between tide-marks and in 4-10 fathoms water. 



