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Ascophyllum nodosum

( BOK:Grisetang)                  8 photos (see below for more photos)


Habit
Photo by: Kjersti Sj√łtun
Location: √ėystese, Hardangerfjord, Hordaland
Verified by Network members
Sampling date: 2008-10-28
Published: 2009-03-31

The species forms a zone in the lower intertidal

The species is common in the sheltered intertidal along the coast of Norway. The long, strap-like shoots originate from a common holdfast. The shoots have lateral branching in addition to dichotomous branching. The growing ends of the shoots form a gas vesicle during winter, which makes it possible to determine the minimum age of shoots. The species is dioecious, and the gametes are released from the receptacles during spring. In Norway the species is harvested for the production of seaweed meal.




Habitat
Photo by: Vivian Husa
Location: Fyrsundet, Fedje, Hordaland
Photo is showing (categorized): Thallus
Verified by Network members
Sampling date: 2009-07-26
Published: 2010-03-10


Specimens growing on rock in the tidal zone, note the occurrence of Polysiphonia lanosa growing epiphytically.




Habit
Photo by: Vivian Husa
Location: Fyrsundet, Fedje, Hordaland
Photo is showing (categorized): Thallus
Verified by Network members
Sampling date: 2009-07-26
Published: 2010-03-10





Loose-lying specimens in a shallow lagoon
Photo by: Vivian Husa
Location: Kjelstraumen, Austrheim Hordaland
Photo is showing (categorized): Thallus
Verified by Network members
Sampling date: 2008-04-10
Published: 2010-03-10

In very sheltered localities the species can be loose-lying. This form of the species is called A. nodosum forma scorpioides and has a much narrower thallus with irregular branching and few or no air- vesicles.




Branches carrying receptacles
Photo by: Kjersti Sj√łtun
Location: Ormhilleren, √ėygarden, Hordaland
Photo is showing (categorized): Branching pattern
Verified by Network members
Sampling date: 2010-04-10
Published: 2010-05-14





Release of male gamets
Photo by: Kjersti Sj√łtun
Location: Ormhilleren, √ėygarden, Hordaland
Photo is showing (categorized): Reproductive structure
Verified by Network members
Sampling date: 2010-04-10
Published: 2010-05-14

The species is dioecious. The yellow droplets on the receptacles contain male gamets being released during low tide




Release of female gamets
Photo by: Kjersti Sj√łtun
Location: Ormhilleren, √ėygarden, Hordaland
Photo is showing (categorized): Reproductive structure
Verified by Network members
Sampling date: 2010-04-10
Published: 2010-05-14

The species is dioecious. The greenish droplets on the receptacles contain female gamets being released during low tide




Shedding of epidermal layer
Photo by: Kjersti Sj√łtun
Location: Ormhilleren, √ėygarden, Hordaland
Verified by Network members
Sampling date: 2006-09-15
Published: 2010-05-14

Shedding of the epidermal layer is probably a defence mechanism against epiphytes



 

     

     

     

     

     

     

     

     

     

     

     

     

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