As a result of bryological excursion in the Ardahan Province in Turkey (Northeast Anatolia), a total of 408 bryophtes belonging to 141 genera and 55 families were determined from 120 different localities, including one hornwort, 37 liverworts and 370 mosses. Among them, Hennediella heimii, Syntrichia minor and Bryum warneum are reported for the second time from Turkey. Also, almost all bryophyte taxa are new for Ardahan Province. Резюме В результате бриологических исследований в 120 точках в

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... винции Ардахан в северовосточной Турции (Северная Анатолия), выявлено 408 видов и разновидностей мохообразных из 141 родов и 55 семейств. В их числе 1 представитель антоцеротовых, 37 печеночников, 370 мхов. Из редких видов можно особо отметить Hennediella heimii, Syntrichia minor и Bryum warneum, находки которых -вторые для Турции. Почти все виды -новые для провинции. The nomenclature of the species follows Ros et al. (2007) for liverworts and Ros et al. (2013), Plášek et al. (2015) and Lara et al. (2016) for mosses. Vouchers are deposited in the Biology Department, Faculty of Science, Karadeniz Technical University, Turkey . The collected bryophytes were investigated and 408 taxa (species, subspecies and varieties) belonging to 141 genera and 55 families were identified. Of them, Hennediella heimii, Syntrichia minor and Bryum warneum are recorded for the second time from Turkey. ANTHOCEROTOPHYTA Notothyladaceae (Milde) Müll. Frib. ex Prosk. Phaeoceros laevis (L.) Prosk. -33, 41, 52, 54, 63: on rock. MARCHANTIOPHYTA Lunulariaceae H.Klinggr. Lunularia cruciata (L.) Lindb. -103, 105: on wet rock. Aytoniaceae Cavers Reboulia hemisphaerica (L.) Raddi -Loc. 105: on soil and rock. Conocephaleaceae Müll. Frib. ex Grolle Conocephalum conicum (L.) Dumort. -17, 111, 118: on soil. Marchantiaceae Lindl. Marchantia polymorpha L. -16, 18, 68, 120: on soil and rock by streams. Pelliaceae H. Klinggr. Pellia endiviifolia (Dicks.) Dumort. -17, 111, 113, 118: on wet soil. P. epiphylla (L.) Corda -16: on wet soil. P. neesiana (Gottsche) Limpr. -18: on wet soil. Calypogeiaceae Arnell Calypogeia muelleriana (Schiffn.) Müll. Frib. -16: on wet soil. Jungermanniaceae Rchb. Jungermannia atrovirens Dumort. -105: on soil and rock. J. gracillima Sm. -105: on soil and rock by stream. J. hyalina Lyell -105: on rock by stream. Tritomaria quinquedentata (Huds.) H. Buch -16: on wet rock. Lophocoleaceae Vanden Berghen Chiloscyphus polyanthos (L.) Corda -15, 62, 66, 68, 78, 119, 120: on wet soil and rock. C. pallescens (Ehrh. ex Hoffm.) Dumort. -105: on wet soil and rock. : on soil and rock. B. hatcheri (A. Evans) Loeske -19, 56, 59: on rock. Diplophyllum albicans (L.) Dumort. -59, 86, 103: on soil and rock. Lophozia ventricosa (Dicks.) Dumort. -114, 116: on wet soil. Scapania aspera Bernet et M. Bernet -12, 59, 103: on wet soil and rock. S. nemorea (L.) Grolle -2, 12: on wet soil and rock. S. subalpina (Nees ex Lindenb.) Dumort. -2, 12: on wet soil by stream. Arnelliaceae Nakai Southbya tophacea (Spruce) Spruce -18, 68, 119, 120: on soil and rock. Plagiochilaceae Müll. Frib. Plagiochila asplenioides (L. emend. Taylor) Dumort -1, 18, 47, 73, 113: on soil and rock. P. porelloides (Torrey ex Nees) Lindenb -18, 73: on soil and rock. Porellaceae Cavers Porella cordaeana (Huebener) Moore -23, 56, 97: on rock. P. obtusa (Taylor) Trevis. -18, 59: on rock. P. pinnata L. -103: on soil and rock by stream. P. platyphylla (L.) Pfeiff. -23, 25, 55, 56, 59, 65: on rock. Radulaceae Müll. Frib. Radula complanata (L.) Dumort. -8, 12, 18, 23, 39, 50, 56, 57: on rock. R. lindenbergiana Gottsche ex C. Hartm. -1, 23, 25, 57, 59: on rock. Frullaniaceae Lorch Frullania dilatata (L.) Dumort. -57, 86: on trunk of tree. F. tamarisci (L.) Dumort. -105: on rock. Metzgeriaceae H. Klinggr. Metzgeria conjugata Lindb. -103: on trunk of tree and rock. M. furcata (L.) Dumort. -103: on trunk of tree and rock.