1. Lower to Middle Devonian spores of North and Central Vestspitsbergen;Allen;Palaeontology,1965
2. A review of in situ Late Silurian and Devonian spores;Allen;Rev. Palaeobot. Palynol.,1980
3. Precordillera region, northwestern Argentina Middle Devonian microfloras from the Chigua;Amenábar,2009
4. Rhacophyton from the Upper Devonian of West Virginia;Andrews;Bot. J. Linn. Soc.,1968
5. An apparently heterosporous plant from the Middle Devonian of New Brunswick;Andrews;Palaeontology,1974