Contribution. I. 



.29 



Syn, Fucus bullatns Fl. Dan. t. 770. 



n 



tr 



tf 



foliaceus Strom in Act. Nidros. p. 347, t 

 caprinus Fl. Dan. t. 1128. 

 delicatulus Fl. Dan. t. 1190. 



1. , fig. 



4 



Ulva caprina Gunn. Fl. Norv. 2^ p. 127. 



w 



w 



w 



» 



delicatula Gunn 1. c. p. 134, t. 8, %. 2* 

 palmata Lyngb. Hydr. Dan. p. 24. 

 soliolifera Lyngb. 1. c. p. 27. 



„ Sommerf. in Act. Mdros. p. 50. 



J h 



!l 



I 



fI 



1 cannot agree witli Kjell ra an as to the f. prolifera a 

 purpuera and p pallida being distinct. According to my ex- 

 perience they run gradually into each other without any li- 

 »iit. The one, a purpur ea, is said to be a more northern 

 form, the other, ^ pallida, a sonthern one, and differing only 



4 



in colour. At Nordland I have often met with them, and 

 there I have observed thatf. prolifera, when growing in shal- 

 low rock-pools between tides, and not too mnch covered by 

 other algæ, assumes as a rule the form pcdlida. But on 

 the other hand, when it grows on the bottom of deeper shady 

 pools or under dense mats of Fucaceæ it almost ever assu-' 

 nies the form pnrpiirea, and sometimes itbecomesrather thick ' 

 or even leathery. The plant growing more or less ,free the 

 colour gets paler, with complete transitions to both sides. 



The present species is litoral as well as sublitoral. The 

 typical form is, as far as I know, only litoral, or sometimes 

 descends a Jittle below extreme low-water mark. The form 



r ■ 



sarniensis I have only found in the sublitoral zone, someti- 



I 



mes on a depth of 3 — 4 fathoms, sometimes it descends to 



the lower limit of the zone, on a depth of about 20 fathoms. 



The form prolifera is generally litoral, but I have also tåken 



^Ji, on a depth of 3 — 4 fathoms. The form sohoUfera has been 



-F 



found at Finmarken by V a hl, but I do not know whether 

 :,at East- or West-Finmarken. Sommerfelt has found this 

 , form at Bodo, and I have tåken it in Lofoten. The plant 

 .occurs most commonly on rocks or stones, now and-theji at- 



Vi 



11 



