40 M. Foslie. 



der the forms decurrens and genuina, or forms which are 

 most likely to be reckoned to either of them. Sometimes 

 they are almost destitute of lateral branches, sometimes these 

 branches are rather numerous, and then the forms approache 

 more or less other forms of the species. Now and then I 

 have met with specimens of f. decurrens reminding of G. cir- 

 cinatum, a plant rather common at some places in Nordland. 

 I have only seen a few individuals of f. prolifera and f. pe- 

 dicellata, the former at Kjelmo in Sydvaranger in rock-pools 

 between tides, and the latter at Vadso fastened to Bhodo- 

 mela lycopodioides and the root of Laminar ia saccharina with- 

 in the sublitoral zone, on a depth of 5 — 8 fathoms. 



The species in question occurs chiefly in rock-pools 

 within the litoral zone, attached to stones or more commonly 

 to Corallina and the smaller Fucacece, partly also to Chondrus 

 crispus, Halosaccion ramentaceum and Bhodomela lycopodioides. 

 It also descends into the sublitoral region, but here I have 

 seldom met with it. Specimens with tetrasporangia have 

 been found in July and August, with sporocarps in the la- 

 ter half of July and in August. 



Distribution: Commonly spread along the whole coast, 

 at some places, for inst Mehavn, plentiful. 



Gen. Ptilota (Ag.) J. G. Ag. 

 Spec. Alg. 2, p. 92; Ag. Syn. Alg. p. XIX; ex parte. 



Ptilota elegans Bonnem. 



Hydr. loc. p. 22, sec. J. G. Ag. Spec. Alg. 2, p. 94. 

 Descr. Ptilota elegans J. G. Ag. Epicr. p. 74. 

 Fig. „ sericea Harv. Phyc. Brit. t. 191. 



Exsicc. „ elegans Aresch. Alg. Scand. exsicc. No. 11. 

 „ plumosa Wyatt, Alg. Danm. No. 77. 



Litoral and sublitoral. Within the latter zone it pro- 

 bably has a scanty distribution. I only once found it there, 

 $tta^hed to stones on a depth of about 5 fathoms. Within 



