An encrusting red seaweed (Hildenbrandia rubra)
|Researched by||Megan Mardle||Refereed by||This information is not refereed|
|Authority||(Sommerfelt) Meneghini, 1841|
|Other common names||-||Synonyms||Verrucaria rubra Sommerfelt, 1826|
An encrusting seaweed that is rose-red, dark-red or red-brown in colour with no surface markings. The thin thallus (0.2-0.5 mm thick) forms an extensive crust with an irregular outline on the surface of rocks, stones and pebbles. In some areas, crusts can be as large as 15 cm across.
Recorded distribution in Britain and Ireland
Widely distributed and common throughout the rocky shores in Britain and Ireland.
Cosmopolitan with a wide distribution throughout north-west Europe.
Found on rocks, stones and pebbles at all tidal levels of the shore. Particularly abundant in moist, shaded areas and the upper shore due to its tolerance of temperature, light and salinity. It is also the only red crust found on rock in the upper shore.
Depth rangeUpper to lower shore
- Thin, unmarked encrusting layer 0.2-0.5 mm thick.
- Colour varies from rose red to dark red.
- Dull when dry.
- Irregular outline.
- No rhizoids.
The accurate identification of different species of dark encrusting seaweeds requires sectioning and microscopic examination. It can be confused with Hildenbrandia crouaniorum, which is found in similar locations. However, they can sometimes be distinguished by colour as Hildenbrandia crouaniorum normally has a more brownish red colour than Hildenbrandia rubra, which is a brighter rose-red colour.
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Bunker, F.StD.P., Brodie, J.A., Maggs, C.A. & Bunker, A.R., 2017. Seasearch Guide to Seaweeds of Britain and Ireland (Second edition). Plymouth: Wild Nature Press.
Fish, J,D., Fish, S., 2011. A Students Guide to the Seashore (Third edition). Cambridge: University press.
Guiry, M.D. & Guiry, G.M. 2015. AlgaeBase [Online], National University of Ireland, Galway [cited 30/6/2015]. Available from: http://www.algaebase.org/
Hiscock, S., 1986b. A field key to the British Red Seaweeds. Taunton: Field Studies Council. [Occasional Publication No.13]
This review can be cited as:
Last Updated: 14/01/2022