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DELEVORYAS, T. 1964. A probable pteridosperm microsporangiate fructification from the Pennsylvanian of Illinois. Palaeontology, 7, 1, 60–63.
Theodore Delevoryas Schopfitheca boulayoides gen. et sp. nov., a new probable pteridosperm microsporangiate organ from an 'ironstone' concretion from the Mazon Creek area of Illinois is described as a pubescent, clavate-pyriform structure with large spores of the Monoletes (= Schopfipollenites) type. The Palaeontological Association (Free Access)