26 M. Foslie 



Algfl. t. 12, fig. 3. But I have often met with specimens 

 which were still more narrow, with an almost linear and 

 thread narrow frond. Exceptionally this form has been found 

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

 I have taken 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 Maria or Laminaria, more seldom 

 on Delesseria 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 taken 

 richly sporocarpiferous individuals at the end of August. 



Distribution: Common and pretty plentiful all along the 

 unsheltered coast, rather scarce in the inner part of the 

 deeper bays. 



Gen. Euthora J. G. Ag. 

 Alg. Liebm. p. 11; Spec. Alg. 2, p. 383. 



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



1. c. Fucus cristatus L. in Turn. Hist. Fuc. 1, p. 48. 



f. typica. 

 Deser. Euthora cristata J. G. Ag. Epicr p. 360. 

 Fig. Khodymenia cristata Harv. Phyc. Brit. t. 307. 

 Exsicc. Euthora cristata Aresch. Alg. Scancl. exsicc. No. 308. 



f. angustata Lyngb. 

 Hydr. Dan. p. 13. 

 Descr. Sphaerococcus cristatus /? angustatus Lyngb. 1. c. 



Syn. Fucus gigartinus Guun. Fl. Norv. 2, p. 1.06. 

 „ cristatus Sommerf. Suppl. p. 184. 

 „ coccineus /? pusillus Wg. Fi. Lapp. p. 500. 

 Rhodymenia cristata Aresch. Phyc. Scand. p. 299. 



Besides the typical form of this species there occurs si 



