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- W2022133701 abstract "1. This paper records the occurrence of a number of plants found as petrifacts from Calhoun coal mine, Richland County, Illinois. The plants belong to the genera Calamites, Sphenophyllum, Lepidodendron, Lepidostrobus, Sigillaria, Mazocarpon, Botryopteris, Anachoropteris, Psaronius, Heterangium, Myeloxylon, and Cardiocarpus. 2. It appears that there are no constant anatomical distinctions between the Eu-Sigillariae and the Sub-Sigillariae. 3. The branching of petioles of Botryopteris americana is described." @default.
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- W2022133701 date "1934-03-01" @default.
- W2022133701 modified "2023-09-26" @default.
- W2022133701 title "Pennsylvanian Flora of Illinois as Revealed in Coal Balls. I" @default.
- W2022133701 doi "https://doi.org/10.1086/334401" @default.
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