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Acknowledgements
L. T. Ellis acknowledges the support of the Natural History Museum, London, and is grateful to H. Bednarek-Ochyra (KRAM) for the loan of Lisowski's collections of African Calymperaceae. The contributions by R. Ochyra have been financially supported by the statutory fund of the W. Szafer Institute of Botany of the Polish Academy of Sciences. He is also thankful to the curator at NSW for the loan of specimens. The contribution of V. Plášek is part of research projects of EU structural funding Operational Programme Research and Development for Innovation, project No. CZ.1.05/2.1.00/19.0388 and by the Ministry of Education, Youth and Sports of the Czech Republic in the ‘National Feasibility Program I’, project LO1208 ‘TEWEP’. Mariusz Wierzgoń was funded by a grant from Scholarship and Training Fund (EEA Grants, Norway Grants). He is also grateful to Starri Heiðmarsson (Icelandic Institute of Natural History, Reykjavík) and Bjarni D. Sigurdsson (Agricultural University of Iceland, Reykjavík) for their help and logistic support during the fieldwork. The research of Daniel Spitale was performed within Contract No. WDD15/2017 «Sampling, Sample Analysis and Evaluation of Biological Quality Elements. Implementation of Article 8 of Directive 2000/60/EC». Contractor: I.A.CO Environmental & Water Consultants Ltd. Contracting Authority: Water Development Department, Ministry of Agriculture, Rural Development and Environment, Republic of Cyprus. The study by A. D. Potemkin was supported by RFBR project 18-05-60093 Арктика and the work of S. S. Kholod was carried out within institutional research project ‘Spatial organization and mapping of vegetation in northern Eurasia’ (AAAA-A19-119030690002-5) of Komarov Botanical Institute RAS. The study by A. I. Maksimov was carried out within the framework of the institutional research project 0221-2017-0048. The work of V. Fedosov was supported by RSF Grants ## 14-50-00029 (field work) and 18-14-00121 (laboratory work). The work of I.N. Pospelov was partly supported by the governmental contract # 0109-2018-0080. The contribution by J. A. Calleja, V. Mazimpaka and F. Lara has been supported by the Spanish Ministries of Science and Innovation (CGL2011–28857/BOS) and Economy and Competitiveness (CGL2016-80772-P). S. Ştefănuţ acknowledges the support by project no. RO1567-IBB03/2019 through the Institute of Biology Bucharest of Romanian Academy. The specimen of Porotrichopsis flacca was collected by M. Burghardt under investigation permit 008-2015-IC-FLO-DPAP-MA of the Ecuadorian Ministry of Environment. P. Srivastava, I. Omar and A. K. Asthana are thankful to the Director, CSIR-NBRI, Lucknow for encouragement and providing facilities. Grateful thanks are due to Ministry of Environment Forest & Climate Change, New Delhi for providing financial assistance. Thanks are also due to Forest Department of Odisha for granting permission and help to explore the Eastern Ghats.