A new sporangium from the American Carboniferous
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HOSKINS, J. H. & CROSS, A. T. (1943). Monograph of the Paleozoic cone genus Bowmanites (Sphenophyllales). Amer. Midl. Nat. 30 113-163.
KOSANKE, R. M. (1950). Pennsylvanian spores of Illinois and their use in correlation. Illinois State Geol. Surv. Bull. 74: 1-128.
MAMY, S. H. (1957). Biscalitheca, a new genus of Pennsylvanian coenopterids, based on its fructification. Amer. Journ. Bot. 44: 229-239.
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RADFORTH, N. W. (1939). Further contributions to our knowledge of the fossil Schizaeaceae; genus Senftenbergia. Trans. Roy. Soc. Edinburgh 59: 745-761.
SCHOPF, J. M., L. R. & BENTALL, R. (1944). An annotated synopsis of Palaeozoic fossil spores and the definition of the generic groups. Illinois State Geol. Surv. Rep. Investig. 91: 1-66.
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