A red seaweed (Aglaothamnion diaphanum)
|Researched by||Rose Edwards||Refereed by||Admin|
|Authority||L'Hardy-Halos & Maggs, 1991|
|Other common names||-||Synonyms||-|
Recorded distribution in Britain and IrelandThis rare species is known in the British Isles from only a few records from the Isles of Scilly.
HabitatUsually grows on large algae as an epiphyte but also on bedrock, and rarely found growing on pebbles. This subtidal species grows from 7-25 m depth and can tolerate moderately wave exposed sites.
- Uninucleate vegetative cells.
- Zig-zag or U-shaped short side branches (carpogonial branches).
- Thalli consisting of one to a few erect axes attached by small discoid filamentous holdfast and secondary creeping axes.
- Hairs are abundant on female plants but absent during the spore-producing phase in the life cycle (bisporophytes).
Additional informationCould be confused with very small non-reproductive thalli of some growth forms of Compsothamnion gracillimum but Compsothamnion species are multinucleate in contrast to Aglaothamnion, which is uninucleate. Thalli reproductive from a small size and are usually easily recognisable by the reproductive spores (bisporangia). Identification of single specimens can be difficult, so if possible a number of thalli should be collected.
- none -
Howson, C.M. & Picton, B.E., 1997. The species directory of the marine fauna and flora of the British Isles and surrounding seas. Belfast: Ulster Museum. [Ulster Museum publication, no. 276.]
Maggs, C.A. & Hommersand, M.H., 1993. Seaweeds of the British Isles: Volume 1 Rhodophycota Part 3A Ceramiales. London: Natural History Museum, Her Majesty's Stationary Office.
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Last Updated: 11/07/2003