Contribution. t. 



91 



This species occurs in rock-pools between tides, or in the 

 upper part of the sublitoral zone, on a depth of 2 — 5 fathoms. 

 It is most often to be met witli on open coasts, and hereit 



attains a lengtli of 30 cm., usnally 10 



15 cm. It bears 



zoosporangia in the later part of June and, more richly, in 



July. 



Distribution: Scattered along the whole coast, at some 



places (Berlevaag, Mehavn) common but not plentifuL 



Gen. Leathesia (Gray.) J. G. Ag. 



Ålg. Syst. 2, p. 40; Gray. Brit. Pl. 1, p, 301; char. mut. 



Leathesia difformis (L.) Aresch. 



Phyc. Scand. p. 376; Tremella difformis L. Fl. Suec. p. 429. 

 Dcscr. Leatliesia marina J. G. Ag. Spee. Alg. 1, p. 53. 



Fig, 



„ tubcriformis Harv. Pliyc. Brit. t. 324. 



Corynephora baltica Kiitz. Tab. Phyc. 8, t. 3. 



» 



marina Kiitz. 1. c. t. 3. 



Exsicc, Leathesia difformis Aresch. Alff Scand. exsicc. No. 101 et 214, 



w 



» 



Hauok et Richt. Phyc. univ. No. 172. 



Syn. Chætophora marina Lyngb. Hydr. Dan. p. 193. 



A litoral alga, growing in rock-pools in the upper part 

 of the zone, fastened to Cladophora gracilis. I have only 

 seen a few dwarfish specimens. 



Distribution: Only found at Berlevaag, very rare. 



Fam Myrionemaceæ (Thur.) 



in Le Jol. Liste Alg. Cherb. p. 15; lim. mut, 



/" 



Gen. Myrionema Grev. 



Crypt. FL No. 300, sec. J. G. Ag. «pec. Alg. 1, p. 47. 



Myrionema strangulans Grev. 



1. c. 



fk^QT. Myrionema strangulans Harv, Phyc. Brit. t, ?80 



! 



