Northern tooth weed (Odonthalia dentata)
|Researched by||Marie Skewes||Refereed by||Admin|
|Authority||(Linnaeus) Lyngbye, 1819|
|Other common names||-||Synonyms||-|
Brownish-red to deep purple in colour, darkening with age, with a glossy surface. Frond 2-6 cm across, regularly alternately notched with sharply pointed apices, and thickened in centre forming a midrib in older parts of the plant. Fronds attached to the substratum by a solid discoid holdfast 5-13 mm in diameter, composed of fused radiating, root like, rhizomes.
Recorded distribution in Britain and IrelandRecorded throughout Scotland and Ireland including the Isle of Man on the west coast of Britain and Flamborough Head on the east coast and an isolated recording in Lyme Bay.
Global distributionPresent from Spitzbergen to the British Isles, and from Arctic Canada to Nova Scotia.
HabitatOdonthalia dentata can be found growing on boulders, bedrock and mobile substrata in lower-shore pools and from near extreme low water to approximately 20 m depth. Found at moderately to extremely wave-exposed sites and at wave-sheltered sites with exposure to strong tidal currents.
- Frond less than 2 mm across main axes.
- Axes arising singly or in dense tufts with a variable overall shape.
- Secondary branches arise from the margins of young and mature axes.
- Reproductive bodies formed in dense clusters along the margins of main axes.
Fronds are perennial but plants on mobile substrata do not survive the winter.
- none -
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Last Updated: 29/07/2007