Oldham, T. and J. Morris. (63) Fossil Flora of the Gondwana system. Vol. I. pt. i. Fossil Flora of the Rajmahal series in the Rajmahal Hills. Mem. Geol. Surv. India [2], Calcutta.
Oliver, F. W. (02) A vascular Sporangium. New Phytologist, vol. I. p. 60.
—— (04) On the structure and affinities of Stephanospermum, Brongn., a genus of fossil Gymnosperm seeds. Trans. Linn. Soc. vol. VI. pt. 8.
Peach, C. W. (78) On the circinate vernation, fructification, and varieties of Sphenopteris affinis and on Staphylopteris (?) Peachii of Etheridge and Balfour, a genus of plants new to British rocks. Quart. Journ. Geol. Soc. vol. XXXIV. p. 131.
Pelourde, F. (08) Recherches sur la position systématique des plantes fossiles dont les tiges out été appelées Psaronius, Psaroniocaulon, Caulopteris. Bull. Soc. bot. France [4], tome VIII.
—— (082) Recherches comparatives sur la structure de la racine chez un certain nombre de Psaronius. Ibid. p. 352.
—— (09) Recherches comparatives sur la structure des fougères fossiles et vivants. Ann. Sci. nat. vol. X. p. 115.
—— (092) Observations sur un nouveau type de pétiole fossile, le Flicheia esnostensis. Mém. Soc. d’hist. nat. d’Autun, tome XXI.
Penhallow, D. P. (92) Additional notes on Devonian plants from Scotland. Canadian Rec. Sci. vol. V. no. 1.
—— (02) Osmundites skidegatensis. Trans. R. Soc. Canada [2], vol. VIII. sect. 4.