Desmarestiales
Encyclopedia
Desmarestiales is an order
in the brown algae
(class Phaeophyceae). Member of this order have terete or ligulate (flat) pinnately branched thalli attached by discoid holdfast
s. They have a sporphytic
thallus usually aggregated to form a pseudo parenchyma
. The genus
Desmarestia is named after the French zoologist Anselme-Gaétan Desmarest (1784 - 1838).
As their general name of the class suggests their pigment
ation is brown.
Order (biology)
In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...
in the brown algae
Brown algae
The Phaeophyceae or brown algae , is a large group of mostly marine multicellular algae, including many seaweeds of colder Northern Hemisphere waters. They play an important role in marine environments, both as food and for the habitats they form...
(class Phaeophyceae). Member of this order have terete or ligulate (flat) pinnately branched thalli attached by discoid holdfast
Holdfast
A holdfast is a root-like structure that anchors aquatic sessile organisms, such as seaweed, other sessile algae, stalked crinoids, benthic cnidarians, and sponges, to the substrate. ...
s. They have a sporphytic
Sporophyte
All land plants, and some algae, have life cycles in which a haploid gametophyte generation alternates with a diploid sporophyte, the generation of a plant or algae that has a double set of chromosomes. A multicellular sporophyte generation or phase is present in the life cycle of all land plants...
thallus usually aggregated to form a pseudo parenchyma
Parenchyma
Parenchyma is a term used to describe a bulk of a substance. It is used in different ways in animals and in plants.The term is New Latin, f. Greek παρέγχυμα - parenkhuma, "visceral flesh", f. παρεγχεῖν - parenkhein, "to pour in" f. para-, "beside" + en-, "in" + khein, "to pour"...
. The genus
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
Desmarestia is named after the French zoologist Anselme-Gaétan Desmarest (1784 - 1838).
As their general name of the class suggests their pigment
Pigment
A pigment is a material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption. This physical process differs from fluorescence, phosphorescence, and other forms of luminescence, in which a material emits light.Many materials selectively absorb...
ation is brown.