Fucus serratus

Sägetang (Fucus serratus), with fruiting bodies

The Sägetang (Fucus serratus) is a Fucus species from the class of brown algae that is also present in the North Sea and Baltic Sea.

Description

The Sägetang is a perennial Großalge (seaweed) with a size of about 30 cm. On the base it is connected to an adhesive plate with the ground. The leathery, rough, brown-green thallus is stalked at the base shortly, otherwise flattened, dichotomously branched in one plane and traversed by a midrib. The Thallusrand is sharply cut, after which the name refers. He is to be distinguished from the bladder through the absence of gas bubbles by flat Thallusenden from Spiraltang. The smooth, vegetative Thallusenden the Sägetang carries colorless hairs which arise from hair and pits are visible as white dots.

Reproduction

Fucus species are diploid generation without change. From September to May ( seminal receptacles ) are developed at the Thallusenden fruiting bodies. These are flat and therefore not as noticeable as in the related species in the Sägetang. The seminal receptacles contain jug -shaped recessed into the surface, warty Konzeptakeln in which the gametes are formed. The Sägetang is dioecious, ova and sperm cells (swarm ) occur on different copies ( dioecious ). With the rising tide the germ cells exit. After fertilization, the zygote establishes and grows into a new diploid alga zoom. In June and July the old degenerate fruiting bodies and to the Thallusenden young Konzeptakeln be created.

Occurrence

The Sägetang is widespread in the eastern North Atlantic from Spain to Spitsbergen and is also found in the North Sea and Baltic Sea. As an introduced species, he also grows on the North American Atlantic coast.

He inhabited the middle and lower intertidal zone down to the Tangwaldzone below the low water line. He prefers protected or little exposed areas and can be found in the zoning of the Fucus species are farthest down.

System

The first description of Fucus serratus was made in 1753 by Carl Linnaeus in Species Plantarum, Volume 2, page 1158. The Sägetang belongs to the genus Fucus in the family of Fucaceae within the order of the Fucales.

Synonyms of Fucus serratus L. are Halidrys serrata (L.) Stackhouse and Virsodes serratum (L.) Kuntze.

Use

In Ireland and France Sägetang is used for the production of seaweed extracts for cosmetic products and Tangbäder (thalassotherapy ).

Swell

• Michael D. Guiry, G. M. Guiry: Fucus serratus. In: AlgaeBase - World -wide electronic publication, National University of Ireland, Galway, accessed March 21, 2012 (sections systematics, occurrence)
• Michael Guiry: The Seaweed Site: information on marine algae: Fucus serratus accessed 21 March, 2012 (Sections Description, usage )
• P. Korn man P.H. Sahling: seaweed from Helgoland - Benthic green, brown and red algae. Biologische Anstalt Helgoland, Hamburg 1983, ISSN 0017-9957, pp. 162-167 (Sections description, reproduction)