FOLKLORE

The recorded use of Fucus vesiculosus, also called "bladderwrack" or "sea wrack" dates back to at least the time period of the Eclectic Physicians of the 19th century. Historically these physicians used this seaweed for goiter (swelling of the tissue or cells of the thyroid) and for obesity. Published commentary by a turn of the century physician (Dr. J. Herbert Knapp) indicated that he had found this plant to be a specific remedy for both exophthalmic and uncomplicated goiter. Earle Claxton referred to medicinal uses by the First Nations.

.Description: Fucus vesiculosus is a mid-shore species of wrack that is generally easily recognised by its paired bladders occurring on either side of a prominent midrib. The frond is generally not strongly spiralled (Fucus spiralis), and does not have a serrated edge (Fucus serratus). Fucus vesiculosus is attached by a small, strongly attached disc which gives rise to a short stipe. The reproductive receptacles are swollen area at the tips of fronds that have many flask-shaped cavities called conceptacles. These house the male and female reproductive structures known as antheridia (borne on antheridiophores) and oogonia (containing 8 eggs). The eggs and sperm are liberated onto the surface of the receptacles and a pheromone (sex-attracting substance) is released by the eggs that attracts the sperm. Fertilization results in a zygote that forms a new Fucus adult.

Distribution: This species is common on the mid inter-tidal rocks of all the islands at Race Rocks.

REFERENCES:

http://www.dadamo.com/napharm/gk9.htm

http://www.marlin.ac.uk/index2.htm?dams/Fucres.htm