48 



branches. The Greenlandic material of this species agrees well 

 with the Icelandic plants (Jonsson 1. c.) and three forms con- 

 nected with numerous intermediate forms are distinguishable. 



f. typica Jönss. 1. c. p. 368. 



Large specimens about 7 — 15 cm. high, and about 300— 

 500// thick, only at the base loosely entangled. Occurs in the 

 sublittoral region down to a depth of 7 fathoms. 



f. iittoralis Jönss. 1. c. p. 370. 



This form is lower than the typical form, 4 — about 10 cm. 

 high, and narrower, about 200 — 300 (j. thick, and much more 

 richly entangled in the lower part of the frond. Occurs at 

 low-water mark and in the uppermost part of the sublittoral 

 region. 



f. debilis K. Rosenv. Grl. Havalg. p. 908. 



This form has only been collected loose and entangled 

 between other algae as DictyosipJmn foeniculaceus f. flaccida 

 and Chœtomorpha Melagonium^ in sheltered places in a depth 

 of 3 — 7 fathoms. The specimens are low and 190 — 260^ thick. 

 It seems to be most closely related with the f. Iittoralis from 

 which it differs especially by the peculiar, often unilateral 

 branching (cfr. Rosenvinge 's description I.e.). 



The species was collected in May — August, with sporangia 

 in June — August. It grows in the littoral region near low-water 

 mark, and in the sublittoral region down to a depth of 7 fathoms. 

 It mostly occurs on stones and rocks, but occasionally also on 

 different algæ. 



The species is presumably common in West Greenland. 



Gr. occ: Upernivik (L. K. R.); Sarkak in Vajgat, Unartok 

 in Vajgat, Ujaragsugsak in Vajgat, Klokkerhuk (N. H.) ; Godhavn 

 (L. K. R.); Agto (Sörensen); Tatsip-ata (N. H.) ; Holstensborg (Th. 

 Holm, L.K.R., N. H.); Sukkertoppen (L.K.R.); Godthaab (L.K.R.. 

 C.Petersen); Merkuitsok, Fiskernæsset (L. K. R.); Frederikshaab, 

 Nigamiut pr. Frederikshaab, Kvannefjord (N. H) ; Ivigtut (L. K. R.) ; 



