Abstract
The distinctive spores produced byLophosoria, an extant monotypic fern, are examined ultrastructurally and correlated with the sporoderm of fossilCyatheacidites. The morphological and ultrastructural similarity of the two taxa provide additional information that can be used to trace the evolutionary history of this spore type.
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Kurmann, M.H., Taylor, T.N. Sporoderm ultrastructure ofLophosoria andCyatheacidites (Filicopsida): Systematic and evolutionary implications. Pl Syst Evol 157, 85–94 (1987). https://doi.org/10.1007/BF00939183
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DOI: https://doi.org/10.1007/BF00939183