2 Dansk Botanisk Arkiv, Bd. 2. Nr. 2. 



e. g. at the shores of the Færoes l ). But this fucaceous vegetation 

 is also the most vigorously developed and as is well known the 

 corresponding vegetation in the northern seas is much behind the 

 vegetation of the Laminar iaceæ. 



After the Fucaceæ it is the representatives of the Dictyotaceæ 

 and also forms of the Encæliaceæ which attain to some size and 

 are found in greater masses in the West Indies, apart from these 

 most of the forms are small. Upon stones in shallow water 

 brown crusts of Ralfsia expansa are common and upon rocks on 

 the north west coast of St. Croix Aglaozonia canariensis forms 

 large red brown expansions. 



As to the number of species found at the shores of the islands 

 (40 species) this is also not great ; compared with that found at 

 the shores of the Færoes (73 species) it is only a little more 

 than half. 



The brown algæ occur from low water mark (the tide is nearly 

 wanting at the islands) or a little above, and down to a depth of 

 about 40 meters where Zonaria variegata was still found well 

 developed; as mentioned in the introduction to the Chlorophyceæ 

 section I have not been able to dredge in greater depth. 



With regard to the earlier contributors to our knowledge of 

 the algæ of the islands I refer to the information given in the 

 Chlorophyceæ, just as in the case of collectors of algæ etc. 



Here I wish only to express my best thanks to the botanists 

 who in different ways have helped me by the working out of 

 the present paper. 



I am much indebted to M me Weber-van Bosse and Professor 

 C. Sauvageau for having been so kind as to send me original 

 specimens of different species to compare with the mine. 



And especially my thanks are due to Professor P. Kuckuck 

 who by reason his extensive knowledge especially of the Phæosporeæ 

 has been able to give me much valuable information. 



Finally, I am much obliged to the Direction of the Carlsberg 

 Fund for the grant in aid of the drawings and reproduction. 



1 ) Comp. F. Børgesen, The Algæ-vegetation of the Færoese coasts, 1905. 

 (Botany of the Færoes, Part III). 



