368 



f. ramosa Kjellm., 1. c. 



f. subsimplex Rupr. Kjellm., 1. c. 



I think the Færoese material may be referred to the three 

 above-mentioned forms; f. subsimplex appears to be the most common, 

 but often occurs as a transition to f. robusta. Formå ramosa is rare; 

 I have only felt justified in re f erring a few of the specimens to it. 



Along the Færoes this species occurred both in sheltered locali- 

 ties and, at a single place (Svino), on the open sea-shore which 

 was, however, more or less sheltered by some low rocks standing 

 in the sea opposite to it. According to Jonsson's notes, in the 

 latter locality it grew near low-water mark, but in sheltered piaces 

 it must most properly be said to grow in the sublittoral zone, 

 though in very shallow water, and the specimens growing at the 

 highest piaces are doubtless occasionally left dry at very low tide. 

 Here it grows on large or small stones often associated with nume- 

 rous green algæ, as already noted by Rostrup. 



Tetraspore-bearing piants were found in May, June and No- 

 vember. 



This species which was first found by Rostrup (1. c. p. 83) ap- 

 pears to be rare along the coasts of the Færoes. Besides the well- 

 known habitat near Klaksvig (Bordo), where it occurs in abundance 

 along the shore, it has been found by Jonsson near the so-called 

 »Havn« (Svino) and by me in Vestmanhavn (Str.) where it grew under 

 similar circumstances to that near Klaksvig, and likewise associated with 

 numerous green algæ. 



This species has thus been found onry in the northern part of the 

 Færoes and must probably have been carried thither by the polar 

 current from off the east coast of leeland. As already pointed out by 

 Rostrup (1. c. p. 1G) this seems to be its southernmost limit of dis- 

 tribution. 



Order DELESSERIACEAE. 

 NITOPHYLLUM Grev. 



32. N. laceratum (Gm.) Grev. ,1. Agardh, Spec. Alg., Vol. 3, p. 409; 

 Le Jolis, Alg. mar. de Cherb., p. 136. 



This alga, which is beyond doubt very rare in the Færoes, 

 was found somewhat below low-water mark in a cave near Kvivig, 

 occurring here in small pink patches on Lithothamnion polymorphum 

 and Corallina officinalis and atlaching itself to these algæ by menus 

 of its numerous rhizoids. It is probably this form which Crouan 

 (Florule du Finistére, p. 153) cailed Nitophyllum reptans, as pointed 

 out by Le Jolis (1. c). 



