, Contribution. I. 27 



narrow one, the above quoted f. angustata Lyngb. This 

 form is analogous, to the before mentioned narrow form of 

 Odonthalia dentata and RJiodophylUs dichotoma. It is on just 

 the same or corresponding localities as these, that Euthora 

 cristata cbeafly assumes the form angustata. Also of this form 

 I have seen almost thread narrow specimens with nearly li- 

 near branches, much differing from the typical one. According 

 to my experience they pass, however, so gradually into each 

 other, that no limit can be drawn between them. 



The species in question is usually sublitoral, growing on 

 stones, shells of Balanidse, or more frepuently attached to other 

 algse, as Laminaria hyperborea, Ptihta and Lithothamnia, 

 on a depth of 2 — 15 fathoms. Sometimes it occurs within 

 the litoral zone, in rock-pools at low-water mark. It prefers 

 open shore and appears scattered. The length rarely exceeds 

 4 cm. At East-Finmarken it has been taken with sporocarps 

 in July and August; at West-Finmarken in May to Septem- 

 ber; in Tromso amt in July and August; at Nordland during 

 all the summer, according to Kleen, and I have myself 

 found it with such organs in September, Octoher and January. 

 Tetrasporiferous specimens have been collected at East-Fin- 

 marken in August; at West-Finmarken in September; and at 

 Nordland all the summer according to Kleen. 



Distribution; Commonly spread along the whole coast, 

 and almost entering the inner end of the great bays. 



Gen. Rhodymenia (Grev.) J. G. Ag. 

 Alg. Liebm. p. 15; Grev. Alg. Brit. p. 84; char. mut. 



Rhodymenia palmata (L.) Grev. 

 1. c. p. 93; Fucus palmatus L. Spec. PI. 2, p. 1162. 



f. typica. 



a nuda Kjellm. 

 JST, Isb. Algfl. p. 188. 



