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• Dr. Sándor Polgár, my grandfather

  185–187.

  Anna Menzl

  Views:

  85

  My grandfather, dr. Sándor Polgár was the second son of a Jewish family the members of which were at home in northwestern Hungary since generations as were the family of his wife Margit Csillag. He attended Benedictine secondary school in Győr and completed his studies at the Faculty of Sciences in Budapest where he got a teaching diploma for sciences at secondary school level. After that he obtained his PhD degree in aquatic plants. Beside science and pedagogy he was also interested in philosophy and music and he spoke fluent German and French. A number of his students became later successful scientists in Hungary and abroad. He was murdered together with my grandmother and a large number of his family members in Auschwitz.

• Contributions to the flora of the Danube River in Komárom-Esztergom and Fejér counties (Hungary)

  157–168

  Norbert Riezing

  Views:

  272

  The present paper focuses on the aquatic and Nanocyperion vegetation of the Danube flood­plain. Most of the data show the results of the surveys in 2019 at low water levels. The Nanocyperion and aquatic vegetation of the Komárom-Esztergom County section is relatively well researched com­pared to the Fejér County section which was previously poorly known. In the last decade, two rare spe­cies – Hippuris vulgaris and Hydrocharis morsus-ranae – have disappeared between Gönyű and Neszmély (Komárom-Esztergom County). In contrast, several new invasive plants have appeared: Salvinia molesta, Myriophyllum aquaticum, Limnobium laevigatum, and Crassula helmsii (first record from Hungary). Vallisneria spiralis and Elodea canadensis were detected again after several decades. Elodea nuttallii and Azolla sp. have become more widespread and abundant than previously. New and uncommon Nanocyperion species were the native and protected Lindernia procumbens and the inva­sive Lindernia dubia. New invasive plants in the studied Danube sections were: Cyperus esculentus, Euphorbia maculata, and Eleusine indica. The native Veronica catenata and Schoenoplectus triqueter have become more wide­spread than before. Polygonum graminifolium was an interesting find of open pebble surfaces in several parts of the examined area, which has no recent records in Hungary from before 2015 (published here).