Barbara A. R. Mohr, David B. Lazarus, Paleobiogeographic Distribution of Kuylisporites and Its Possible Relationship to the Extant Fern Genus Cnemidaria (Cyatheaceae), Annals of the Missouri Botanical Garden, Vol. 81, No. 4 (1994), pp. 758-767
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Mohr et al. (1994) studied this question.