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Ascophyllum (Fucophyceae, brown seaweed)

Ascophyllum nodosum from the coast of New Hampshire USA
Summer growth form has good vesicles and receptacles have dehisced.
Photograph posted online as ecad scorpiodes

Ascophyllum nodosum from the coast of New Hampshire USA illustrates lateral receptacles.
Good indicator of more protected habitats along intertidal zone; replaced by Fucus spp. in exposed regions. Photograph by © James Gerweck, University of New Hampshire, Durham USA

Ascophyllum nodosum from the coast of New Hampshire USA
Photograph by © James Gerweck, University of New Hampshire, Durham USA

Ascophyllum nodosum from the coast of New Hampshire USA
Photograph by © James Gerweck, University of New Hampshire, Durham USA

Ascophyllum nodosum from the coast of New Hampshire USA
Transitional form toward ecad scorpiodes (A. Mathieson, UNH Durham USA)
Photograph by © James Gerweck, University of New Hampshire, Durham USA

Ascophyllum nodosum from the coast of New Hampshire USA
Transitional form toward ecad scorpiodes (A. Mathieson, UNH Durham USA)
Photograph by © James Gerweck, University of New Hampshire, Durham USA

Ascophyllum nodosum ecad scorpiodes
This form often grows entangled among salt marsh grasses. Neither air bladders nor the reproductive system develop. Dried biomass of this ecad have been used as packaging material and likely are responsible for carrying species around the world, introducing them as invasives. Further such use should be discouraged. (A. Mathieson, University of New Hampshire Durham, USA).
Photograph by © James Gerweck, University of New Hampshire, Durham USA

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