40 



M. Foslte, 



der the forms decurrens and genuina, or forms whicli are 

 most likely to be reckoned to either of them. Sometimes 

 they are almost destitute of lateral branches, sometimes these 



branclies 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 C cIt' 

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

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

 dicellata, the former at Kjelmo in Sydvaranger inrock-pools 

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

 mela lycopodloides and the r o oi of Laminar i a saccharina with- 

 in the snblitoral 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 Gorallina and thesmaller Fucacece, partly alsoto Ghondrus 

 crispus, Halosaccion ramentaceitm and Wtodomela lycøpodioides. 

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

 seldom met with it. Specimens with tetrasporangia have 

 been found in Jnly 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. 



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



Ptilota elegans Bonnem. 



Hydr. loe. p. 22, sec. J. G. Ag. Spee. Alg. a, p. 94.' 

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



sericca ITarv. Phyc. Brit. t. 191. 

 elegans Aresch. Alg. Scand, exsicc. Ko. 11. 

 plumosa Wyatt, Alg. Danm. No. 77. 



Fig. 



Exsicc. 



» 



n 



H 



Litoral and snblitoral. Within the latter zone it pro- 

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



Itttnched \o stojies m a depth of etfho^^ 5 fotbomst *""" ' 



1 



