463 



that it should be omitted from the list of the Færdese algæ. But, of 

 course, there is just a possibility of its haviug been conveyed thither 

 from Norway or the British Isles. 



Order FUCACEAE. 

 HALIDRYS Lyngb.) Grev. 



150. H. siliquosa (L.) Lyngb., Hydrophyt., p. 37; Kjellm., N. I., 

 p. 243 (194). 



Found attached only in Skaalefjord near Glibre, where large 

 specimens of a metre or more in length occur in about one fathom 

 of water. Specimens gathered in the middle of May were sterile, 

 but some found late in October had fruit. 



Besides occurring in the above-mentioned habitat — Glibre (Ost.) - 

 where it was observed by S i mm o ns, Jonsson and myself, it has been 

 found detached floating about or east ashore at the following piaces: — 

 Bor do: Klaksvig (Rostr.); Str. : Hvidenæs (Rostr., H. S.), Thorshavn (!). 

 Lyngb ve does not mention this species as occurring in the Færoes, 

 but Landt (1. c. p. 228) reports it from these islands. 



ASCOPHYLLUM Stackh. 



151. A. nodosum (L.) Le Jol. Rosenv., Grønl. Havalg., p. 832; 

 Ozothallia nodosa Kjellm., N. I., p. 243 (194); Halidrys nodosa Lyngb., 

 Hydrophyt., p. 37. 



Besides the common form, another occurs along the coasts 

 of the Færoes which is smaller and more delicately built in all 

 its parts. It is much sienderer than the form in Le Joliss Alg. 

 mar. de Cherb., No. 101, though the latter is far from large. The 

 difference between the common large form and the small one is 

 shown in the accompanying illustration (lig. 66) reproduced from 

 a photograph of the two forms. The branches of the small form 

 are narrower; the largest air-bladders are hardly more than one- 

 third the size of those in the large form, and the same applies lo 

 the receptacles, etc. It occurs here and there togelher with the 

 typical form, and grows in large bushes like the latter. 



This species is very common in sheltered localities, but mav 

 also be met with in more exposed piaces, viz., off the west-coast of 

 Sydero, on rocky islels, where il grows on the sides of the rocks 

 facing the land. During a storm these islets are completely dashed 

 over by the breakers. Where tides prevail it grows somewhat 

 above half-tide level; where their inlluence is not felt, e. g. in 



