Fucales


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Fucales

[fyü′kā·lēz]
(botany)
An order of brown algae composing the class Cyclosporeae.

Fucales

 

an order of brown algae of the class Cyclosporeae. The thalli are bushy and measure 0.1 to 2 m long (less commonly, to 10 m); they have cylindrical or flat branches marked by apical growth. Fucales differ from other algae in development cycle. The thalli are diploid sporophytes, in which develop, from special solitary cells (spores), diploid gametophytes in the form of a layer of special cavities, or conceptacles. There is meiosis with gameto-genesis. The oogoniums have one to eight egg cells. In some species that have a single egg cell, fertilization and the early stages of development occur on the maternal plant. Reproduction by fragments of thalli results in plants that are unable to form organs of attachment and reproduction.

There are about 300 species, making up 40 genera. The three principal families are Fucaceae, Cystoseiraceae, and Sargassa-ceae. The algae grow in all seas except in the Aral and the Caspian. The USSR has 21 species belonging to seven genera. The algae are used in the production of alginates, feed meal, and fertilizers; some species are used as food.

IU. E. PETROV

References in periodicals archive ?
1962 Classification and the distribution of the Fucales.
Photosynthetic gas exchange under emersed conditions in eulittoral and normally submersed members of the Fucales and the Laminariales: interpretation in relation to C isotope ratio and N and water use efficiency.
Most genera in this order of phaeophytes such as Nereocystis, Macrocystis, and Laminaria, and many in the order Fucales (Sargassum, Cystoseira) form dense "forests" that greatly reduce the light reaching the substrate, decisively influencing the recruitment, growth, reproduction, and survival of smaller algae.
Humm & Hildebrand (1962) hs/GMJ/* [vickersiae] Kapraun (1980) hs/RB/* Cowper (1978) dft/GMJ/* Edwards & Kapraun (1973) */GMJ,RB,AB/* ORDER FUCALES SARGASSACEAE [dagger] Sargassun fluitans Edwards (1976) gom,plg/GB/C (Borgesen) Borgesen Humm & Hildebrand (1962) gom,plg/GB/A [dagger] S.
Fucales (Phaeophyceae) from Spain characterized by large-scale discontinuous nuclear DNA contents consistent with ancestral cryptopolyploidy.
Adiciones a las Phaeophyceae marinas de Cuba, Fucales.