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An order of brown, large, structurally complicated, often highly differentiated members, commonly called kelps, of the algal class Phaeophyceae; distinctive features include a life history in which microscopic, filamentous, dioecious gametophytes alternate with a massive, parenchymatous sporophyte, and a mature sporophyte typically consisting of a holdfast, stipe, and one or more blades.



(kelps), an order of brown algae.

The Laminariales are the largest marine plants (to 10–15 m and more in length). The thallus consists of a simple or branched stipe, with rhizoids or a foot at the base, that bears one or more large blades. The conducting elements are sievelike tubules, similar in structure to the phloem cells of flowering plants, and serve to transport the products of photosynthesis. Laminariales grow by means of a growth zone located at the base of the blade and in the upper part of the stipe. The holdfasts and the stipe are usually perennial; the blades are destroyed annually. Once a year the blades yield zoospores, which develop into microscopic gametophytes. The sexual process is oogamy. The egg cell does not separate from the gametophyte; a new, large thallus (sporo-phyte) grows in its place.

There are about 30 genera of Laminariales (100 species), living principally in temperate and cold seas; they are found in all of the northern and Far Eastern seas of the USSR. Laminariales are used as food, for medical purposes (for example, sea kale), as cattle fodder, for fertilizer, and to obtain alginic-acid salts and mannitol.


References in periodicals archive ?
Survey on sexual pheromone specificity in Laminariales (Phaeophyceae).
Exogenous inorganic carbon source for photosynthesis in seawater by members of the Fucales and Laminariales (Phaeophyta): ecological and taxonomic implications.
These include (1) a change from perennial Laminariales beds to Sargassum macrocarpum C.
Abalone feed on large Phaeophyceae, especially Laminariales and Sargassaceae; in this article, we use the term macroalgal beds to refer to the algal beds of perennial Laminariales and/or Sargassaceae.
Other ampithoids use hosts from the seaweed orders Fucales and Laminariales, which are poor in nonpolar chemical defensive metabolites (Macaya et al.
Oligoalginate recognition and oxidative burst play a key role in natural and induced resistance of sporophytes of Laminariales.
2005a Laminariales Alginate Oligoguluronate + degraders Kupper et al.
Sexuality in the Laminariales is strictly controlled by environmental cues and is coordinated by chemical interaction.
to a number of other genera and families in the Laminariales.
Effects of small herbivorous sea-snails on survival rates of the young Laminariales plants (in Japanese with English abstract).
Food value of marine algae of order Laminariales for growth of the abalone Haliotis discus hannai.