Abstract
A rachis of the fossil filicalean fern Botryopteris antiqua containing abundant septate hyphae with clamp connections is preserved in a late Visean (Mississippian; ~330 Ma) chert from Esnost (Autun Basin) in central France. Largely unbranched tubular hyphae pass from cell to cell, but may sometimes produce a branch from a clamp connection. Other clamp-bearing hyphae occur clustered in individual cells or small groups of adjacent host cells. These hyphae may be tubular, catenulate with numerous hyphal swellings, or they may display a combination of both. The Visean hyphae with clamp connections predate Palaeancistrus martinii, the heretofore oldest direct fossil evidence of Basidiomycota, by some 25 Ma.
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Acknowledgments
This study was supported by funds from the National Science Foundation (EAR-0949947 to T.N.T. and M.K.) and the Alexander von Humboldt-Foundation (V-3.FLF-DEU/1064359 to M.K.). We extend our sincere appreciation to Jean Dejax, Dario De Franceschi, and Jean Broutin (Paris, France) for making the slide from the “collection Renault” available and for their continued support of our research program on fossil microorganisms. The paper greatly benefited from the constructive comments and suggestions of two anonymous reviewers.
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Krings, M., Dotzler, N., Galtier, J. et al. Oldest fossil basidiomycete clamp connections. Mycoscience 52, 18–23 (2011). https://doi.org/10.1007/s10267-010-0065-4
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DOI: https://doi.org/10.1007/s10267-010-0065-4