Acrosiphonia arcta(Dillwyn) Gain

Stor grøndott in Norwegian Nynorsk
Stor grønndott in Norwegian Bokmål


The species Acrosiphonia arcta belongs to:


Photos of Acrosiphonia arcta (3):

  • Photo of Acrosiphonia arcta
  • Photo of Acrosiphonia arcta
  • Photo of Acrosiphonia arcta

1 of 3: Habit

Photo of Acrosiphonia arcta
Bright green and densely branched thallus Photo: © Kjersti SjøtunTerms of use

Note: The species is abundant in the littoral zone during spring. Thallus is bright green, uniseriate and densely branched, and may become up to 10-15 cm long. Axes carry descending rhizoids with somewhat less pigmentation. Some branches end in a conspicuous curved or hooked branch. The tips of branches become pointed or spinous as growth ceases. The sporophyte is a unicellular structure (the ‘Codiolum’-stage).

2 of 3: Detail showing hook branches and spinous branches

Photo of Acrosiphonia arcta
Photo: © Kjersti SjøtunTerms of use

3 of 3: Microscope picture showing branches and rhizoids

Photo of Acrosiphonia arcta
Branches with descending rhizoids (some indicated by arrows)  Photo: © Kjersti SjøtunTerms of use

Closest relatives

Other species in the same genus (Acrosiphonia):