26 



M. Foslie. 



^. 



Algfl. t, 12, %. 3. But I have offcen met with specimens 

 which were still more narrow, with an almost linear and 

 thread-narrow frond. Exceptionally this formhas beenfound 

 on open coast, but only on loose or clayish bottom. Thus 

 I have tåken it at Mehavn. On the other hand specimens 

 are to be found with branches even 12 mm. in breadth in 

 its broadest part. The species grows generally together 

 with Ptilota, most often Pt. pectinata, or attached to this one, 

 and also on the root of Alaria or Laminaria, more seldom 

 Bélesseria sinuosa. It bears sporocarps in June, July and 

 August, and tetraspores in August, although rather scarce. 

 The greatest number of specimens collected by me in the 

 named months were sterile. In Tromso amt I have tåken 

 richly sporocarpiferous individuals at the end of August. 



Distrihution : Common and pretty plentiful all along the 

 nnsheltered coast, rather scarce in the inner part of the 

 deeper bays. 



on 



Gen. Euthora J. G, Ag. 



Alg. Liebm. p. llj Si)ec. Alg. 2, p. 383. 



Euthora cristata (L.) J, G. Ag. 



n _ _ 



1. c. Fucus cristatus L. in Turn. Rist. Fnc. 1, p. 48. 



f. typica, 



Descr, Eutliora cristata J. G. Ag. Epicr p. 3G0. 



JPig. Rliodymenia cristata Harv. Pliyc, Brit. t. 307. 



Exsicc. Euthora cristata Aresch. Alg, Scand. exsicc. No. 308. 



J 



f. angusfata Lyngb. 



Hydr. Dan. p. 13. 

 Descr. Sphærococcug cristatus ^ angustatus Lyngb. 1. c. 



Syn. Fucus gigartinus Guun. Pl. Norv. 2, p. 106. 



„ cristatus Sommerf. Suppl. p. 184. 

 „ coccineus ^ pusillus Wg. F;. Lap]). p. 500. 

 • Ehodymenia cristata ArcscK Phyc. Scand. p. 299. 



Besides the tj^pical form of this species there occurs a 



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