1. “Levicaulis arranensis”, gen. et sp. nov., a lycopsid axis from the Lower Carboniferous of Scotland;Beck;Transactions of the Royal Society of Edinburgh,1958
2. Mississippian Horton Group of Type Windsor-Horton District, Nova Scotia;Bell;Geological Survey of Canada Memoir,1960
3. First discovery of a stem with internal structure referable to Leptophloem rhombicum from the Upper Devonian, Xinxiang;Cai;Acta Palaeontologica Sinica,1986
4. Lycophyta;Chaloner,1967
5. Plants and spore compression in sediments;Chaloner,1999