TAXONOMIC REVISION OF THE GENUS DIDYMODON HEDW. (POTTIACEAE, BRYOPHYTA) IN EUROPE, NORTH AFRICA AND SOUTHWEST AND CENTRAL ASIA

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  The moss genus Didymodon Hedw. is revised for Europe, North Africa, and Southwest and Central Asia. A key, descriptions, illustrations, distribution data, LM and SEM photographs of the 30 species recognized are provided. Lectotypes for Barbula icmadophila Schimp. ex Müll. Hal., Desmatodon rupestris Funck ex Brid., Didymodon angustifolius Warnst., D. austriacus Schiffn. & Baumgartner, D. cordatus var.flaccidus Röll, Tortula sinuosa Mitt., T. acuta Brid., T. gracilis Schleich. ex Hook. & Grev., T. insulana De Not., and Zygotrichia cylindrica Taylor are proposed. Barbula rigidula var. desertorum J. Froehl. and Trichostomum lamyanum are newly synonymized with D. rigidulus Hedw. and D. brachyphyllus (Sull) R. H. Zander respectively. Didymodon angustifolius Warnst. and D. cordatus var. schisticolus C. C. Towns. are excluded from the genus Didymodon. New records for countries of the study area are reported.