Brown algae

class of algae

underwater areas with a high density of kelp

polysaccharide found in brown algae

Fucoxanthin is a xanthophyll, with formula C42H58O6. It is found as an accessory pigment in the chloroplasts of brown algae and most other heterokonts, giving them a brown or olive-green color. Fucoxanthin absorbs light primarily in the blue-green to yellow-green part of the visible spectrum, peaking at around 510–525 nm and absorbing significantly in the range of 450 to 540 nm.

Fucoidan is a long-chain sulfated polysaccharide found in various species of brown algae, such as seaweed, and in marine invertebrates. Fucoidan occurs in the cell walls of seaweed serving structural roles.

The molecule laminarin (also known as laminaran) is a storage glucan (a polysaccharide of glucose) found in brown algae. It is used as a carbohydrate food reserve in the same way that chrysolaminarin is used by phytoplankton, especially in diatoms. It is created by photosynthesis and is made up of β(1→3)-glucan with β(1→6)-branches. It is a linear polysaccharide, with a β(1→3):β(1→6) ratio of 3:1. Its hydrolysis is catalyzed by enzymes such as laminarinase (EC 3.2.1.6) that breaks the β(1→3) bonds. It has been suggested that the annual production of algae laminarin amounts to 12 ± 8 gigatons,

Sphacelariales is an order of brown algae (class Phaeophyceae).

Discosporangiales is an order of brown algae. It includes two families, Choristocarpaceae and Discosporangiaceae.

right|thumb|300px|Floating kelp (Macrocystis pyrifera) with many pneumatocysts

Fucophycidae is a subclass of Phaeophyceae (brown algae) which contains the most complex and evolved orders of Chromista algae. The members of this subclass have stalks with several morphological forms and distinct structures, characterized by an intercalary growth and a basic heteromorphic, sometimes secondarily iso- or sub-isomorphic life cycle.

Sphacelariaceae is a family of algae belonging to the order Sphacelariales.

Ishigeales is an order of brown algae. It includes two families, Ishigeaceae and Petrodermataceae. The genus Diplura is also included, but not placed to family.

chemical compound

Onslowiaceae is the only family in order Onslowiales in the brown algae (class Phaeophyceae). The family contains only the genera Onslowia and Verosphacela.

Syringodermataceae is a family of brown algae. It includes two genera, Microzonia and Syringoderma.

Sphacelaria is a genus of brown macroalgae (or seaweed) in the family Sphacelariaceae.

Cutleriaceae is a family of brown algae. It includes two genera, Cutleria and Zanardinia.

REDIRECT Choristocarpus

genus of algae

Ascoseira is a monotypic genus of seaweed in the brown algae (class Phaeophyceae). The single and type species, Ascoseira mirabilis Skottsberg, is a large parenchymatous macroalgae, and is endemic to the Antarctic Ocean. Ascoseira is assigned to its own order. The alga grows in subtidal waters at depths of from 3 to 15 meters.