^mt^ 



18 



M. F slie. 



.?3 



developed it appears on rocks at low-water mark on exposed 

 places, more seldom in rock-pools between tides, and itgrows 

 often gregarions in rather considerable masses. In the sub- 

 litoral zone, to the lowestlimit of whichit sometimes descend, 

 it occurs more scattered. Here it always prefers solid rocky 

 bottom, sometimes also it is fonnd on looser or eveii on 

 clayish bottom, bnt at such places it assumes loosely entang- 

 led and spariagly branched tufts. It is nsually met with on 

 a depth of 3 — 10 fathoms in company with Ptilota, Bélesseria 

 and Rhodophyllis, or epiphytic especially on the first one. 

 Often it almost covers Ftilota pectinata forming rather brist- 

 ly and sparingly branched threads, or loosely entangled tufts. 

 It also often grows in large numbers on the stems oi Ålaria 

 or more commonly Laminaria hjperborea within the upper 

 part of the sublitoral zone. The planthas generally a length 

 of 8—15 cm., but not rarely it becomes 20 cm. long. It bears 



b 



tetraspores in the later half of June, in July and August; 

 sporocarps in July and, more richly. August. 



Distribution: Common and mostly abundant along the 

 open shore, but it also enters almost to the end of the great 

 bays. The form paiens has only been found at Berlevåg; f. 

 formosa at Vardo and Sværholt; f. comosa at Syltefjord and 

 Sværholt; and f. roscola at Sværholt. 



Polysiphonia fastigiata (Roth.) Grev. 



Fl. Edinb. p. 308; Ceramium fastigiatum Roth,' Fl. Germ. 3, p. 4K3. 

 Beser. Polysiphonia fastigiata J. G. Ag. Spee Alg. 2, p. 1029. 



Harv. Phyc. Erit. t. 299. 



Fig, 



JEJxsicc. 



n 



n 



Aresch. Alg. Scaud. exaiee. No. 4. 



r 



Syn. Conferva omissa Gunn. Fl. Norv. 2, p. 78. 



» polymorpha Gunn. I. c. p. 92. 



„ H Wg. Fl. Lapp. p. 511. 



/ 



Hutchinsia fastigiata Sommerf. in Act. Nidros p. 51. 



The species is litoral and oecurs at East-Finmarken only 

 on the same host plant as elsewhere, Ozoiltallia nodosa. AU 



