463 
that it should be omitted from the list of the Faeroese algae. But, of 
course, there is just a possibility of its having 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 Simmons, Jonsson and myself, it has been 
found detached floating about or cast ashore at the following places: — 
Bor do: Klaksvig (Rostr.); Str.: Hvidenses (Rostr., H. S.), Thorshavn (!). 
Lyngb ye does not mention this species as occurring in the Faeroes, 
but Landt (1. c. p.228) reports it from these islands. 
ASCOPHYLLUM Stackh. 
151. A. nodosum (L.) Le Jol. Rosenv., Gronl. 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 Faeroes which is smaller and more delicately built in all 
its parts. It is much slenderer than the form in Le Jolis’s Alg. 
mar. de Clierb., 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 (fig. 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 to 
the receptacles, etc. It occurs here and there together with the 
typical form, and grows in large bushes like the latter. 
This species is very common in sheltered localities, but may 
also be met with in more exposed places, viz., off the west-coast of 
Sydero, on rocky islets, where it 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 influence is not felt, e. g. in 
