No complete Irish checklist.
Of the 53 described classes of algae that potentially occur in Ireland, only 12 have been comprehensively checklisted, and these are mostly marine. The desmids are the only freshwater group (part of the Zygnemophyceae) that has been comprehensively catalogued.
National checklists are available for seaweeds (green algae belonging to the Chlorophyceae, Bryopsidophyceae, Ulvophyceae, some Chlorophyceae, some Trebouxiophyceae; red algae belonging to the Stylonematophyceae, Compsopogonophyceae, Bangiophyceae and Florideophyceae; and brown algae belonging to the Phaeophyceae). A desmid list has been completed and will be published shortly. A checklist of Characeae is available for the BritishIsles.
- Bryant, J.A., Stewart, N.F. & Stace, C.A., 2002. A checklist of Characeae of the British Isles. Watsonia 24: 203-208.
- Guiry, M.D., 1979. A consensus and bibliography of Irish Seaweeds. Bibliotheca Phycologica 44: 1-287 [513 species].
- John, D.M., Williamson, D.M. & Guiry, M.D., 2011. A catalogue of the desmids (Streptophycophyta, Zygnematophyceae, Zygnematales) of Ireland. Occasional Papers 15. National Botanical Gardens [541 species].
Number of algal species:
1,079 known species (estimated at between 3,000 and 5,000)
Primary sources of distribution data:
- National database of seaweeds in Ireland*. This database was established by NUI Galway in collaboration with the British Phycological Society.
- Irish Wire Weed (Sargassum muticum) Database*. This database was collated by the National Biodiversity Data Centre from different sources.
- John, D.M., Williamson, D.M. & Guiry, M.D., in prep. A catalogue of the desmids (Streptophycophyta, Zygnematophyceae, Zygnematales) of Ireland. Occasional Papers from the National Botanical Gardens.
- Quantitative phytoplankton data from Irish lakes*. EPA data collected for ecological assessment.
- Rocky Shore Macroalgae*. EPA data collected on the macroalgae of rocky shores for Water Framework Directive assessment.
*Databases held by the National Biodiversity Data Centre and made accessible through Biodiversity Maps.
National conservation assessment:
- Article 17 reporting – Lithothamnion corallioides and Phymatolithon calcareum listed in EU Habitats Directive: National Parks and Wildlife Service, 2008. The status of EU Protected Habitats and Species in Ireland. NPWS, Department of the Environment, Heritage and Local Government, Dublin.
- Stewart, N.F. & Church, J.M.1992. Red Data Books of Britain and Ireland: Stoneworts. The Joint Nature Conservation Committee, Peterborough, UK.
Monitoring or repeat surveys in place:
Water Framework Monitoring Programme (EPA). Estuarine & coastal survey work includes algae.