Contribution. I. 



éL 



the lltoral zone it generally occurs on steep rocks oovered 

 by other algæ, as Fucus and OmfhaUia, or on the walls of 

 grotto-shaped cavities most often together with Delesseria 

 alafa. It is only to be fonnd on open shore and best devel- 

 oped in much exposed localities, Even as far eastward as 

 at Vardo I have seen very luxuriant individuals about 15 

 cm. high. However it is most commonly smaller, 4 — 8 cm. 

 Specimens bearing only few tetrasporangia have been cpUec- 

 ted in the later half of July and in the earlier half of Au- 



r 



gust. 



Distrihution: Pretty common along the unsheltered pg,|t 

 of the coast, at some places abundant but local. 



Ptilota plumosa (L.) Ag. 



Syn. Alg. p. 3f*, excl ^; Fucus plumosus L. Mant. p. 134. 

 Descr. Ptilota plunisa J. G. Ag. Epicr. p. 75. 



Fig. 

 Exsicc. 



n 



M 



» 



Harv. Phyc. Brit. t. 80. 



Arepcb. Alg. 3cand. exsicc. No. J60. 



Syn. Fucus plumosus Gunn. Fl. Norv. 2, p. 01. 



3 ptilotua Gunn. 1. c. p. 135. 



ri 



Y> 



« 



cartilagineus Gunn. I. c. p, 108; ex parte. 



n 



vindicatus Gunn. 1. c. p. 1S3; ex parte. 



plumosus a et ^ "Wg. Fl. Lapp. p. 501. 



A generally sublitoral alga, oceurring on a depth of 

 2 — 16 fathoms. Sometimes it appears in rock pools within 

 the litoral zone attached to roots of Laminaria. Bestdevel- 

 oped and most abundant it is to be met with on stony or 

 rocky bottom on open coast, on a depth of 5 — 10 fathoms, 

 attached partly to the rockitself, partly to the stem of Æma 

 and Laminaria^ especially L hyperhorea. Particularly at 

 Berlevaag and Vardo I have collected very luxuriant speci- 

 mens, which had a length of 30- -35 cm. On some localities 



- n 



it grows gregarious in rather large number. It appears also 

 in the greater bays or else in sheltered localities, but here it 



jj^Y^f bec9m?s sq vigorouslj^ døveloped ^ on t^e unsbelt^r^ 



i: 



