F. Børgesen : Phæophyceæ of the Danish W. Indies. 



63 



var. joliosissima (Lamx.) J. Ag. 



J. Agardh, Spec. Sargasso-rum Austral., p. 108. 



Fucus folios issimus Lamouroux, Essai Thalassiophytes (Ann. du Mu- 

 seum d'Hist. nat., vol. 20, 1813, p. 36, pi. 7, fig. 1). 



This form is different from the typical one by having nume- 

 rous, closely packed . leaves which are smaller, proportionally 

 shorter, and more or less 

 undulate, frequently some- 

 what twisted. 



The receptacles are shor- 

 ter and similar to the vesicles 

 hidden between the leaves. 



This species is very com- 

 mon along the shores of the 

 islands and occurs in exposed 

 or sheltered places. In ex- 

 posed localities, where the 

 sea constantly splashes the 

 rocks, Sargassum vulgare is 

 able to thrive above the or- 

 dinary water mark; in the 

 more sheltered places it occurs 

 close to it, or a little below. 



Sargassum vulgare is the 

 dominant species in the Sar- 

 gassum - vegetation forming 

 with Turbinaria trialata a 

 vegetation of large, brown 

 algæ corresponding with the 

 Fucaceæ - vegetation in nor- 

 thern seas. 



Fig. 43. Sargassum vulgare C. Ag. Part 



of a plant with receptacles and vesicles. 



(A little over natural size, about Mr, 



magnified). 



Geogr. Distrib. This spe- 

 cies is said to occur at nearly all 



subtropical and tropical shores of the Atlantic Ocean: America and the 

 West Indies, Africa, Spain etc. 



2. Sargassum lendigerum (L.) Kiitz. 



KüTziNG, Species Algarum, p. 612; Tabulæ Phycologicæ, vol. XI, 

 tab. 19, fig. II. J. Agardh, Species Sargassorum Austral., p. 110. F. Børge- 

 sen, 1. c. p. 4. 



Fucus lendigerus L., Species plant., p. 1628. Turner, Fuci, p. 107, tab. 48. 



