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Laminaria form a habitat for many fish and invertebrates. [3] The life cycle of Laminaria has heteromorphic alternation of generations which differs from Fucus. At meiosis the male and female zoospores are produced separately, then germinate into male and female gametophytes. The female egg matures in the oogonium until the male sperm ...
The eggs mature and are released two at a time, one from each oviduct. [2] Each egg is enclosed in a thick, dark brown case measuring 10–13 cm (3.9–5.1 in) long and 3.5 cm (1.4 in) wide. There are tendrils at the four corners, that allow the female to secure the egg cases to bunches of seaweed (usually Cystoseira spp. or Laminaria saccharina).
Fucus serratus in its natural habitat The eggs or sperm (here) form in conceptacles sunken in receptacles towards the tips on the branches. The lamina shows cryptostomata – small cavities which produce colourless hairs. Fucus serratus is a seaweed of the north Atlantic Ocean, known as toothed wrack, serrated wrack, [1] or saw rack. [2] [3]
Membranipora is a genus of bryozoans in the family Membraniporidae.A typical example is the widely distributed species Membranipora membranacea that commonly encrusts seaweeds, particularly fronds of the kelps Laminaria digitata, L. hyperborea, and Saccorhiza polyschides.
Species of Fucus are recorded almost worldwide. They are dominant on the shores of the British Isles, [5] the northeastern coast of North America [6] and California. [3]In the British Isles these larger brown algae occur on sheltered shores in fairly well defined zones along the shore from high-water mark to below low water mark.
Laminaria is high in iodine, a nutrient crucial for proper thyroid function. In addition to promoting thyroid health, members of the family Laminariaceae can be used to induce and aid in labor. Pieces of laminaria can be put in the cervix and water added. The laminaria absorbs the water and enlarges, making the opening of the cervix larger.
This is the only place it lays eggs, and it can do so on many species of kelp and seaweed, [9] including species of Laminaria and Fucus. [10] A female fly lays up to five clutches of 80 eggs each. [11] The larvae feed upon the bacteria coating the dead kelp. [9] The life cycle is about 30 days long. [1] [11]
Laminaria (right) Osmotic dilators, also known as hygroscopic dilators, are medical implements used to dilate the uterine cervix by swelling as they absorb fluid from surrounding tissue. [1] They may be composed of natural or synthetic materials. A laminaria stick or tent is a thin rod made of the stems of dried Laminaria, a genus of kelp.