Contribution. 1 29 



Syn. Fucus bullatus Fl. Dan. t. 770. 



„ foliaceus Strom in Act. Nidros. p. 347, t. 1. fig. 4. 

 „ caprinus Fl. Dan. t. 1128. 

 „ delicatulus Fl. Dan. t. 1190. 

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

 „ delicatula Gunn 1. c. p. 134, t. 8, fig. 2. 

 „ palmata Lyngb. Hydr. Dan. p. 24. 

 „ sobolifera Lyngb. 1. c. p. 27. 

 „ „ Sommerf. in Act. Nidros. p. 50. 



I cannot agree with Kjellman as to the f. prolifera a 

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

 perience they run gradually into each other without any li* 

 mit. The one, a purpurea, is said to be a more northern 

 form, the other, (S pallida, a southern one, and differing only 

 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 much covered by 

 other algse, assumes as a rule the form pallida. But on 

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

 pools or under dense mats of Fucacece it almost ever assu- 

 mes the form purpurea, and sometimes it becomes rather 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 little below extreme low-water mark. The form 

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

 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 taken 

 it on a depth of 3 — 4 fathoms. The form sobolifera has been 

 found at Finmarken by V a h 1, but I do not know whether 

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

 form at Bo do, and I have taken it in Lofoten. The plant 

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



