^:^'- ■ 



22 



M. Foslie 



The ra ost comraon form o£ the species resembles fig. 2, 

 t. 247 in. Har v. Phyc. Brit. and usually becomes 3—5 cm. 

 high, not exceeding 10 cm., by 1—2 mm. in breadth,^) 



As far as I have seen the plant only occurs in the li- 

 toral zone, either in rock pools or more frec[uently on steep 

 rocks covered by Fucus and OøothaUia, and on the walls of 



I 



grotto-shaped cavities together with Ptilota elegans. It is 

 only to be found on open coasts and appears best developed 

 in much exposed localities. All the specimens collected in 

 June, July and August were sterile. 



Disfrihution: The plant occurs all along the unsheltered 

 coast, and at several places, for inst. Mehavn, Berlevåg, 

 Havningberg and Vardo, it is pretty common but not plen- 

 tiful. 





.^ 



Delesseria sinuosa (Good. et Woodw.) Lamour, 



Ess. p. 124; Fucus sinuosus Good. et Woodw. Linn. Trans. 3, p. Ill 



f, typica. 



Beser. Delesseria sinuosa J. G. Ag. Spee. Ålg. 3, p, 691, 

 Exsice, 



Harv. Phyc. Brit. t. 259. 

 Wyatt. Alg. Danm. No. 62. 



f. quercifoUa Turn. 



Hist. Fuc. 1, p. 74. 



K) Kle en says (1. c): „When it (Delesseria alata) occurs on dark pla- 

 ces between tides it secms to assume the var. aw^^w^^xVrna (Harv. Phyc. 

 Brit. t. 83). This form was conimon on stones beneath Fucaceæ^. 

 Taking this for granted Kjcllman records D, angustis sima in hia 

 Ish. Algfl. (p. 172). Of course 1 should not deny or even think it 

 unlikely that D. angusHssima is to he found in Nordland, but, on 

 the other hand, I want to point out the fact that the narrow form of 

 D. alata aiso there is common just on localities like those quoted 

 by Kle en for D. angustissima, Moreover he says that D. ahUa 

 grows in rock-pools between tides (and within the sublitoral zone), 

 but he adds nothing about its occurrence in other parts of the li- 

 toral zone. I therefore suppose it to be highly probable that K 1 e e n s 



P. alata var? miguslissima bclongsto the narrow form of J^.alqta, 



