1. A Devonian lycopod stem with well-preserved cortical tissues;Palaeontology,1971
2. Morphometric reconstruction, palaeobiology and phylogeny of Oxroadia gracilis Alvin emend. & O. conferta sp. nov.: anatomically preserved rhizomorphic lycophytes from the Dinantian of Oxroad Bay, SE Scotland;Palaeontographica B,1992
3. Hizemodendron gen. nov., a pseudoherbaceous segregate of Lepidodendron (Pennsylvanian): phylogenetic context for evolutionary changes in lycopsid growth architecture;Systematic Botany,1991
4. Experimental cladistic analysis of anatomically preserved arborescent lycophytes from the Carboniferous of Euramerica: an essay on paleobotanical phylogenetics;Annals of the Missouri Botanical Garden,1992
5. Levicaulis arranensis, gen. et sp. nov., a lycopsid axis from the Lower Carboniferous of Scotland;Transactions of the Royal Society of Edinburgh,1958