108 M. Foslie. 



Descr. Sphacelaria racemosa var. arctica Rke 1. c 

 Fig. „ arctica Kjellm. 1. c. t. 2, fig. 4—6. 



Syn, Conferva pennata Wg. Fl. Lapp. p. 512; ex parte. 



According to Reinke 1. c, it seems almost to be a fact 

 that Sphacelaria arctica is identic with or so nearly related 

 to Sphacelaria racemosa that it at most may be regarded 

 as a form of the latter. 



The plant is litoral, occurring on rocks or in rock-pools 

 in the lower part of the zone, seldom epiphytic on other al- 

 gae, as Rhodomela lycopodioides. Probably it also descends 

 into the sublitoral zone. In June, July and August only 

 barren specimens have been found. 



Distribution: Scattered and rather scarce along the 

 whole coast. 



Sphacelaria olivacea (Dillw.) Ag. 



Spec. Alg. 2, p. 30; Conferva olivacea Dillw. Brit Conf. p. 57.? 

 Descr. Sphacelaria olivacea J. G. Ag. Spec. Alg. 1, p. 30. 

 Fig. „ „ Pringsh. Sphac. t. 9, fig. 1 — 3. 



„ „ Traill et Holmes Sphac. t. 2, fig. 2. 



Exsicc. „ „ Aresch. Alg. Scand. exsicc. No. 410. 



Litoral, growing gregarious mostly on steep rocks and 

 often together with other algae, as Bhodochorton Hothii, Galli- 

 thamnion scopulorum, Ptilota elegans and Delesseria alata. It 

 occurs on open as well as sheltered coasts. Specimens col- 

 lected in July and August were sterile. 



Distribution: Rather scarce along the whole coast. 



Fain. Ectocarpaceae (Ag.) Thur. 



in Le Jol. Liste Aig. Cherb. p. 14; Ag. Syst. Alg. p. XXX, lim. mut. 



Gen. Isthmoplea Kjellm. 

 Algenv. Murm. Meer. p. 30. 



Isthmoplea sphaerophora (Harv.) Kjellm, 



