Ragweed
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Ragweed ( Palmaria palmata ) |
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| Palmaria palmata | ||||||||||||
| ( L. ) Kuntze |
The ragweed ( Palmaria palmata ) is a perennial and edible plant species within the sub-kingdom of the red algae (Rhodoplantae) in the genus Palmaria . It is known as “Dulce” in France and “Dulse” in Great Britain and Ireland. In Iceland it is called Söl.
description
Lobe wrack is very rich in shape and has a vivid brown-red to purple-red color. It reaches heights of growth between five centimeters and half a meter. The alga is attached to the substrate with a disk-shaped base . From this a single, simple, short shoot usually arises , which expands into a simple or dichotomous lobe. The edge of the lobe is split into broad, narrow linear or oval segments. The shape of these leaf-like branches is very variable and they can be between 8 cm and 30 cm wide. The cloth has a leather-like texture.
Multiplication
Lappentwrack has a very unusual generation change for red algae , which was not fully understood until 1980. Distributed sori carrying the tetraspores sit on the fully grown diploid lobe . The sori with the male sex cells are mainly distributed on the front of the lobe. The female gametes are very small and crippled or crusted. Carposporophytes are found as single cells in very young plants. After the carposporophyte has been fertilized, a new diploid algae germinates and overgrows the female plant. So mature plants are almost always male.
distribution
Ragweed sits on stones or other algae in the intertidal zone . It is quite common and in some cases it is also stock-building.
The species is the only species of the genus Palmaria that is distributed in the Atlantic Ocean . It is found from the coast of Portugal to the Baltic States and is also widespread around Iceland and on the coasts of the Faroe Islands. Ragwrack is also found on the coasts of Russia, Arctic Canada, Alaska, Japan, and Korea. Reports of occurrences on the California coast always relate to Palmaria mollis and are not credible.
Culture
Rag wrack is traditionally used as a food. The oldest tradition of this can be found in Columban of Iona in the 6th century. Today ragweed is mainly eaten in Ireland, Iceland and Canada, the taste is slightly nutty.
Web links
Individual evidence
- ↑ a b Palmaria palmata at Algaebase , last accessed June 18, 2015.
- ^ JP van der Meer and ER Todd: The life-history of Palmaria palmata in culture. A new type for the Rhodophyta. In: Can. J. Bot. Vol. 58, 1980. Pages 1250-1256
- ↑ a b L. M. Irvine: Seaweeds of the British Isles. Volume 1. Part 2A. Cryptonemiales (sensu stricto) Palamriales, Rhodymeniales. British Museum (Natural History), London, 1983. ISBN 0-565-00871-4
- ↑ F. Borgesen: Botany of the Faeröes ... Part II. Copenhagen, 1903 (reprint 1970)
- ↑ M. Indergaard and J. Minsaas: 2 Animal and human nutrition. In: MD Guiry and G. Blunden: Seaweed Resources in Europe: Uses and Potential. John Wiley & Sons, 1991 ISBN 0-471-92947-6