Toma C. 1994. Rola ogrodu botanicznego na przykładzie Kew Gardens w  Londynie (The role of botanical garden on
               the example of Kew Garden in  London). 44 Seminarium Geobotaniczne (44 Geobotanical seminar):
               Ścieżki  przyrodnicze jako forma popularyzacji wiedzy o szacie roślinnej (Nature paths as a form of
               dissemination of knowledge on plant cover). 19-20 maj 1994. Polish Botanical Society and  Geobotanical
               Section, Poznań, Poland.
Toma C. 1995. Aktualne rozmieszenie Trapa natans L. w Kotlinie Oświęcimskiej (Current distribution of water caltrop
               Trapa natans in Oświęcim Valley). Konferencja 50-lecia PTB (50 Conference of Polish  Botanical Society):
               Szata roślinna Polski w procesie przemian (Polish plant cover in the process of changes). 26.06.-
               1.07.1995. Kraków, Poland.
Toma C. 1997. The ontogenesis of flower and fruit of Potamogeton lucens in SEM  research. VIII International
              Conference of Plant Emryologists. 16-18.09.1997. Department of Genetics and Cytology, University of
              Gdańsk, Poland.
Toma C.1999. The development of fruitlets of Potamogeton L. genus. IX International Conference of Embriologists.
              20-22.09.1999r. Department of Embryology, Jagiellonian University,  Kraków, Poland.
Toma C. 2001. Reprodukcja Potamogeton crispus L. (Reproduction of Potamogeton crispus L.). 52 Zjazd PTB (52
              Conference of Polish Botanical Society): Botanika w dobie biologii molekularnej (Botany in the era of
              molecular biology). 26.09.2001. University of Adam Mickiewicz, Poznań, Poland.
Toma C. 2001. The development of Stratiotes aloides fruit. Xth International Conference of Plant Embryology: From
              Gametes to Embryos. 5-8 Sept. 2001. Institute of Plant Genetics and Biotechnology of the Slovak
              Academy of Sciences, Nitra, Department of Botany, Slovak Agricultural  University. Nitra, Slovak Republic.
Latowski K., Toma C. 2002. Structural features of the pericarp and seed-coat  surfaces of the Veratrum genus
              against a background of taxonomic differentiation. II International Conference on Plant Anatomy and
              Morphology. 14-18 October 2002. Saint-Petersburg. Russian Academy of  Sciences, Komarov Botanical
              Institute, Russia.
Toma C. 2003. The development of Hydrocharis morsus ranae fruit. XI  International Conference on Plant
              Embryology: Plant Reproduction: from  Mendel  to Molecular Biology. 1-3 September 2003. Masaryk
              University,  Department of  Plant Physiology and Anatomy, Brno, Czech Republic.
Toma C. 2004. Zmiany morfologiczne endokarpów Potamogeton w procesie fosylizacji (Morphological changes of the
              Potamogeton endocarps during its fossilization). 53 Zjazd PTB (53 Conference of Polish Botanical Society):
              Przyroda Polski w europejskim dziedzictwie dóbr natury (Polish nature in the  natural heritage of Europe).
              6-11 września 2004, Toru
ń-Bydgoszcz, Poland.
Toma C. 2005. Reproduction of curled pondweed (Potamogeton crispus L.) in Vesijärvi Lake (Finland). Limnological
             Conference. 13-16.09.2005. Silesian   University, Department of  Earth Science. Cieszyn, Poland.
Toma C. 2005. Comparison of two morphological Stratiotes aloides forms. XVII International Botanical Congress. 17-
             23 July 2005. Society for the Advancement of  Plant Sciences, University of Vienna. Vienna, Austria.
Toma C. 2005. Rozmieszczenie i porównanie dwóch form morfologicznych Stratiotes aloides L. w Jeziorze
             Słosineckim Wielkim (Distribution and comparison of two morphological forms of Stratiotes aloides L. in
             Słosineckie Wielkie Lake). Conference: Taksonomia, chorologia i ekologia roślin w dobie zagrożenia
             różnorodności biologicznej (Taxonomy, chorology and ecology in the era of endangered biodiversity). 15-
             16.09.2005. University of Adam Mickiewicz, Botanical Committee of Polish Academy of Sciences, Polish
             Botanical Society, Poznań, Poland.
Toma C. 2006. Variation of individual characteristics of Potamogeton crispus (L.) in two  ponds. Conference:
             Enviromental changes and biological  assessment III. Department of Biology and Ecology University of
             Ostrava. April 26-28.2006. Ostrava, Czech Republic.
Toma C. 2011. Phenetic similarity of Alismatidae subclass fruits. XVIII International Botanical Congress. 23-30 July
             2011. Australian Botanical Community, University of Melbourne, Australia. 
Toma C. 2012. Comparison of reproduction of Stratiotes aloides at different latitudes in Europe.27-31 August 2012.
            International Symposium on Aquatic Plants.Plants in hydrosystem: from functional ecology to weed
            research. European Weed Research Society (EWRS), International Society on Limnology (SIL), Polish
            Hydrobiological Society (PHA),Poznań University of Life Sciences, Poznań, Poland.

Toma C., Efremov A., N. 2014. Bioróżnorodność typów owoców wodnych roślin okrytozalążkowych we florze
            europejskiej i syberyjskiej (Biodiversity of fruit type of aquatic angiosperms plant taxa in European and
            Siberian Flora). III Ogólnopolska Konferencja Naukowa. Różnorodność biologiczna: od komórki do
            ekosystemu.Zagrożenia środowiska a ochrona gatunkowa roślin i grzybów (III Nationwide Conference.
            Biological biodiversity: from cell to ecosystem. Environmental hazards and the protection of plant species and
            fungi). Polish Botanical Society in Bialystok, Bialystok University of Technology, Faculty of Civil and
            Environmental Engineering,Department of Protection and Environmental Management; University of
            Bialystok, Faculty of Biology and Chemistry, Institute of Biology, Medical University of  Bialystok, Faculty of
            Medicine, Department of General Biology, 12-13.09.2014, Białystok, Poland.

Филоненко, А. B., Ефремов, А. H.,Toma C. 2014. К вопросу о структуре гинецея и плода представителей
           рода Hydrocharis L. (Hydrocharitaceae). 1 - 3 октября 2014 г.Карпология и репродуктивная биология
           высших растений. Материалы II всероссийской научной конференции с международным участием,
           посвящённой  памяти профессора А. П. Меликяна. Федеральное Агенство Научных Организаций,
           Российская Академия Наук, Совет Ботанических Садов России, Фгбун Главный Ботанический Сад им.
           Н.В. Цицина РАН, Московский Государственный Университет имени М.В. Ломоносова. Москва, Russia.

Filonenko, A.V., Efremov, A.N., Toma, C. 2014. On the structure of the gynoecium and fruit of the genus
           Hydrocharis L. (Hydrocharitaceae). 18-19 October 2014. Carpology and reproductive biology of higher plants.
           Proceedings of the 2-nd  Russian conference with international participation dedicated to the memory of
           Professor A. P. Melikian. Federal  Agency of Scientific Organizations, Russian Academy of Sciences, The
           Council of the Botanical Gardens of Russia, N. V. Tsitsin Main Botanical Garden Ras, M. V.Lomonosov 
           Moscow State University. Moscow, Russia.

Toma C.
2014. Analiza obrazu w karpologii - referat plenarny (Image analysis in carpology - plenary lecture).
           Konferencja BIONT, Nowoczesne Techniki Badań Bioróżnorodności BIONT Conference, Modern Techniques of
           Biodiversity Research, Center Study of Biodiversity, 16-17 October, Opole University, Opole, Poland.

Ефремов A.H, Филоненко A.B., Тома C. 2015. К вопросу o структуре генеративных органов представителей
           рода Hydrocharis L. (Hydrocharitaceae) (On the question about generative organs of genus Hydrocharis L.
           (Hydrocharitaceae) representatives). VIII Всероссийской конференции с международным участием по
           водным макрофитам "Гидроботаника - 2015", 16-20 октября 2015 г., Федеральное Агентствo  Нayчных
           Организаций России Российская Академя Наук Федеральное ГосударственноеБюджетное Учреждение
           Науки Институт Биологии Внутренних Вод им. И. Д. Папанина РАН, Борок, Russia.

Latowski K., Toma C., Dąbrowska M., Zviedre E. 2015. Carpological features of Nymphaea and Nuphar and their
           importance in the diagnosis of the species  after blooming. 14th International Symposium on Aquatic Plants.
           International Society of Limnology (SIL), European Weed Research Society (EWRS), Center for Ecology and
           Hydrology, 14-18  Sept. 2015, Playfair Library, Edinburgh, Scotland.
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