This is the fossil stem of a giant lycopsid plant from the coal fields of Czechia, which formed during the Carboniferous Period (359–299 million years ago). This particular fossil is a species of *Knorria*. Lycopsids are related to ferns, so they produce spores rather than seeds. This object is part of the historical ‘Ettingshausen collection’, which is on permanent loan from the Institute of Biology, University of Graz. It is not currently on display. **Specimen**: Large, sand cast of a fossil lycopsid plant stem **Inventory number**: NHMW-GEO-2024/0188/11041 **Collection**: NHMW, Geology & Palaeontology Dept., Palaeobotany (curator: Chris Mays) **Origin**: Karviná, Czechian Silesia, Czechia Find out more about the NHM Vienna [here](http://nhm.at/en). Scanned and edited by A. Haider (NHMW) Scanner: Artec Space Spider Contribution to the Kulturerbe digital (2nd Call) digitization project at the NHMW funded by the [BMWKMS](https://bmwkms.gv.at/)