Algae belonging to the phylum Rhodophyta (Kingdom Plantae) have been classified by Classes, Orders, Families, Species and other infraspecific levels (subspecies, varieties and forms). Ordination is alphabetical. When no infraspecific level is indicated the taxa corresponds to the type variety.
This list has been made using local checklists from Morocco (Benhissoune et al. 2002, 2003), Algeria (Perret-Boudouresque & Seridi 1989), Tunisia (Ben Maiz et al. 1987), Libya (Nizamuddin et al. 1979), Syria (Mayhoub 1976), Aegean Sea (Athanasiadis 1987), Italy (Furnari et al. 2003), Adriatic Sea (Giaccone 1978; Furnari et al. 1999), Corsica (Boudouresque & Perret-Boudouresque 1987), Albères coast (France) (Boudouresque et al. 1984; Knoepffler et al. 1990), Catalonia (Ballesteros 1990), Andalusia (Conde et al. 1996) and Spain (Gallardo et al. 1985), as well as a large number of smaller contributions. When Mediterranean revisions were already available for some taxonomic groups they have been used with some updates and modifications: Ceramiales (Gómez-Garreta et al. 2001), Corallinales (Bressan & Babbini-Benussi 1996, 2003), Acrochaetiaceae (Conde 1991), Laurencia-complex (Furnari et al. 2001; Furnari et al. 2002; Serio et al. 2004, 2008, 2010), Gracilaria (Gargiulo et al. 1992), and Nemastoma (Rodriguez et al. 2004). Lists of Mediterranean introduced species have also been considered (e.g. Boudouresque & Verlaque 2002; Zenetos et al. 2005, 2008; Verlaque 2001; Verlaque et al. in press) as well as some specific papers (e.g. Alongi et al. 2007, 2008; Athanasiadis 1999, 2002; Cormaci et al. 1993; Gargiulo et al. 1986, 1990; Perrone & Delle Foglie 2006; Rodriguez-Prieto & De Clerck 2009). Black Sea is not included.
Taxonomy follows Algaebase (www.algaebase.org) if not otherwise indicated. Endemic species (found only in the Mediterranean basin, Black Sea included) are preceded by the symbol *. A careful and critical examination of the existing records of every species from the available literature has been performed in order to consider a species as endemic. Introduced species are preceded by the symbol #. As it is not always easy to detect introduced species from the distributional records, we mainly follow the criteria by other authors specialized in this issue. Superscript numbers refer to notes. Some of the commonest synonyms found in Mediterranean literature (if any) are sometimes placed after the currently accepted name. Other synonyms can be found at Algaebase. A list of taxa inquirenda as well as a list of taxa excludenda is also given at the end of the list; species of the Order Ceramiales considered as taxa inquirenda or taxa excludenda in Gómez-Garreta et al. (2001) are not stated again.