Lower Palaeozoic sporomorphs: Their stratigraphical distribution and possible affinites. (In: Evolution and Environment in the Late Silurian and Early Devonian. W.G.Chaloner and J.D. Lawson, editors)
Reference:
Richardson,J.B. (1985)
Lower Palaeozoic sporomorphs: Their stratigraphical distribution and possible affinites. (In: Evolution and Environment in the Late Silurian and Early Devonian. W.G.Chaloner and J.D. Lawson, editors) Philosophical Transactions of the Royal Society of London, Series B. Biological Sciences
Vol. 309 # 1138 P. 201- 201