The Indiana paper coal contains plant microfossils identifiable as Bicoloria Horst and Torispora Balme. The sporangium Bicoloria consists of an outer layer of Torispora and an interior mass of membraneous spores. The sporangia, when found in clusters, are attached to each other at their pointed ends and are therefore thought to have been pendant. The name Bicoloria is restricted to intact sporangia, and the name Torispora is retained for isolated, dispersed spores. The range of Torispora securis is extended downward to include the upper Pottsville strata of Indiana (Westphalian B).

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