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population size in plants: implications for conservation. In: D. A. FALK & K. E. HOLSINGER (eds.). Genetics and Conservation of Rare Plants, pp. 3-30. Oxford Univ. Press, New York. BRZOSKO E., WR”BLEWSKA A. & RATKIEWICZ M. 2002. Spatial genetic structure and clonal diversity of island populations of ladys slipper ( Cypripedium calceolus) from the Biebrza National Park (northeast Poland). Mol. Ecol . 11: 2499-2509. BULAK J. & WOCH W. 2007. Ocena liczebnouci populacji miko≥ajka nadmorskiego Eryngium maritimum na wydmach nadmorskich na terenie Parku Krajobrazowego


The paper presents the results of geobotanical studies on the distribution and resources of Aster tripolium L. and Plantago maritima L, two rare halophytes in Poland. The research was conducted in northern Poland, along the Baltic coast in 2013. The present distribution of the two species was compared with historical data and general trends of and threats to these two species were examined. In total, 33 sites of A. tripolium and 18 of P. maritima were found in the research area. The resources of both species have been perceptibly depleting during last 150 years, which is mostly due to human agencies (e.g. habitat devastation caused by growing urban areas and the change in management and/or habitat condition). In order to preserve both species, it may be necessary to start an ex situ conservation program.

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References Ashmore S., Hamilton K. & Offord C. 2011. Conservation technologies for safeguarding and restoring threatened flora: case studies from Eastern Australia. In vitro Cell Dev. Biol. Plant 47: 99-109. Bask in J. M. & Bask in C. 2003. New approaches to the study of the Evolution of physical and physiological dormancy, the two most common classes of seed dormancy on Earth. In: G. Nicolas, K. Bradford, D. Come & H. W. Pritchard (eds.). The Biology of Seeds, pp. 371-388. Recent Research Advances. CABI Publishing, Salamanca-Cambridge. Baskin J. M. & Baskin C

, Jena. H ill M. O., R oy D. B. & T hompson K. 2002. Hemeroby, urbanity and ruderality: bioindicators of disturbance and human impact. J Appl Ecol 39: 708-720. I lves A., M etsare M., T ali K. & K ull T. 2015. The impact of recent colonization on the genetic diversity and fine-scale genetic structure in Orchis militaris (L.). Plant Syst Evol 301: 1875-1886. J äger E. J. (ed.). 2011. Rothmaler – Exkursionsflora von Deutschland. Gefäßpflanzen: Grundband. 20. ed. 930 pp. Spektrum, Heidelberg. J efferson R. G. 1984. Quarries and wildlife conservation in the

References Act 2004. Nature Conservation Act of 16 April 2004. Journal of Laws No 92, item 880. Aulio K. 1980. Accumulation of copper in fluvial sediments and yellow water lilies ( Nuphar lutea ) at varying distances from a metal processing plant. Bull. Environ. Contam. Toxicol. 25: 713-717. Barrat-Segretain M. H. 1996. Germination and colonisation dynamics of Nuphar lutea (L.) Sm. in a former river channel. Aquat. Bot. 55: 31-38. Brzeg A. & Wojterska M. 2001. Zespoły roślinne Wielkopolski, ich stan poznania i zagrożenie. In: M. Wojterska (ed.). Szata roślinna

Annual Report (2009). Tree Kangaroo Conservation Program . Seattle: Woodland Park Zoo. Annual Report (2010). Tree Kangaroo Conservation Program . Seattle: Woodland Park Zoo. Annual Report (2011). Tree Kangaroo Conservation Program . Seattle: Woodland Park Zoo. Anonymus (2007). Declaration of Proposed YUS Conservation Area under the Conservation Act. Port Moresby: Minister for Environment and Conservation. Bláha, J., Soukup, M. & Balcerová, M. (2011). Mental maps by the inhabitants of the village Yawan from an interdisciplinary perspective. Kartografické

. 2003. Handbook of the convention on biological diversity. 2nd edition. Secretariat of the Convention on Biological Diversity, Montreal. Council of the European Communities. 1992. Council Directive 92/43/EEC of 21 May 1992 on the conservation of natural habitats and of wild fauna and flora. Official Journal of the European Communities, series L, 206: 750. Critchley C. N. R., Burke M. J. W. & Stevens D. P. 2003. Conservation of lowland semi-natural grasslands in the UK: a review of botanical monitoring results from agri-environment schemes. Biological Conservation 115

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References A nderson D. G. 2005. Botrychium multifidum (Gmel.) Rupr. (leathery grapefern): a technical conservation assessment. 73 pp. USDA Forest Service, Rocky Mountain Region. Available: A ndrienko T. L. 1996. Botrychium lunaria (L.) Sw. In: Y u . R. S helag -S osonko (ed.). Red Data Book of Ukraine, p. 23. Ukrainian encyclopedia im M. P. Bagana, Kyiv (in Ukrainian). A ndrienko T. L. 2009. Botrychium lunaria (L.) Sw. In: Y a . P. D idukh (ed.). Red Data Book of Ukraine. Vegetable