Pod wrack
| Pod wrack | ||||||||||||
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Halidrys siliquosa , Herbarium Arch |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Halidrys siliquosa | ||||||||||||
| ( L. ) Lyngb. |
The pod wrack ( Halidrys siliquosa ), also known as sea oak , is a brown alga that occurs in the Northeast Atlantic .
description
The brown algae, which is up to 2 m long (rarely up to 3 m), is anchored to the ground with a conical adhesive disc. It has a relatively firm thallus , which is weakly flattened and regularly branched alternately in one plane. The width of the thallus branches is 2 to 5 mm. The main axis is slightly angled at each branch, creating a characteristic zigzag pattern. The color of the thallus is light brown, washed ashore specimens are mostly dark brown in color. The name Schotentang refers to the elongated and chambered swim bladders on the side shoots. These floating bodies are stalked and taper off in a thin point and thus resemble small pods.
The ends of the branches also have lanceolate, flattened receptacles when they are ready for reproduction . On these, the reproductive structures ( conceptacles ) can be seen as small warts. Halidrys siliquosa is monoecious . As a representative of the Fucales , the pod wrack is a diplont without a generation change.
Occurrence
The distribution area includes the coastal regions of the North Sea , the western Baltic Sea and the eastern North Atlantic from Morocco to Norway ( Faroe Islands ).
The pod grows in the sublittoral below the low water line on rocky soil, stones and wood. On Heligoland , stocks are visible when the water is particularly deep in prielen on the west side and broad hollows in the north-east of the island.
Systematics
The pod wrack was first described by Carl von Linné in 1753 under the name Fucus siliquosus in Species plantarum , Volume 2, p. 1160. Hans Christian Lyngbye classified this species in the genus Halidrys in 1819 (in: Tentamen hydrophytologiae danicae , Hafniae, p. 37).
Synonyms of Halidrys siliquosa (L.) Lyngb. are Fucus siliquosus L., Cystoseira siliquosa (L.) C. Agardh and Fucus siliculosus Stackhouse.
The pod wrack belongs to the Sargassaceae family in the order Fucales . He used to be placed in a Strauchtange family (Cystoseiraceae).
swell
- Wolfram Braune: marine algae. A color guide to the common benthic green, brown and red algae of the world's oceans . Ruggell: Gantner, 2008, ISBN 978-3-906166-69-8 , pp. 226-227. (Section description)
- P. Kornmann, PH Sahling: Sea algae from Helgoland . 1983, pp. 170-171. ISSN 0017-9957
- Michael D. Guiry, GM Guiry: Halidrys siliquosa In: Algaebase - World-wide electronic publication, National University of Ireland, Galway , accessed March 21, 2012 (sections systematics, occurrence)
