1. Studies on some Lower Carboniferous plats from East Lothian;Barnard;Ph. D. Thesis,1960
2. Stelar morphology and the primary vascular system of seed plants;Beck;Bot. Rev.,1982
3. Further observations on the genus Lyginorachis Kidston;Calder;Trans. Roy. Soc. Edinburgh,1935
4. Carboniferous;Francis,1983
5. Gymnospermous vegetative patterns in the early Carboniferous;Galtier,1987