Revisiting the Bryophyte Checklist of Algeria: Exploring Diversity and Distribution

A new, updated checklist of the bryophytes of Algeria was compiled from the literature. Reports were made mainly by French botanists in the 19th and first half of the 20th centuries and include a total of 498 taxa, of which 477 are at species level and the rest are at infraspecific rank. It comprises three hornwort species, 118 liverwort taxa (113 species), and 377 moss taxa (361 species). For each taxon, literature records and localities explored in the country are provided. The analysis of the current data reveals that Algeria is the Maghreb country with the second-largest number of bryophyte taxa, behind Morocco. As in other Mediterranean countries, hornworts and liverworts are scarce (24.3%), and mosses are dominant (75.7%). Concerning liverworts and hornworts, the family Ricciaceae and genus Riccia (31 taxa) are the best-represented; the aquatic and ephemeral genus Riella (8 taxa) shows the higher number of species in the Mediterranean countries. Regarding mosses, the family Pottiaceae is the largest one, with 107 taxa (28.4% of the moss taxa), and Tortula (22 taxa) is the most species-rich genus. Algeria has, by now, the lowest species/km2 ratio (0.20 × 10-3) compared to the rest of the Maghreb and some European Mediterranean countries (Greece, Italy, and Spain), due not only to the low degree of knowledge of the bryophyte flora but also to the larger surface area of the country and the great extension of the Saharan region. The high percentages of rare or very rare taxa (72.5%) versus the low percentages of frequent, common, and very common (27.5%) can be an indicator that many areas are still underexplored, and that the bryophyte flora of the country cannot be considered well-known. The revision or collection of new samples of some rare or doubtful taxa would be necessary to assess the reliability of some reports.