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Molecular Evidence for the Diversification of Extant Lichens in the Late Cretaceous and Tertiary

✍ Scribed by Christian Printzen; H.Thorsten Lumbsch

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 242 KB
Volume: 17
Category: Article
ISSN: 1055-7903
DOI: 10.1006/mpev.2000.0856

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✦ Synopsis

A molecular clock based on ITS sequence data from the lichen genera Biatora and Phyllopsora is calibrated with the help of paleoclimatic data and evidence of forest history. The clock indicates that diversification within Biatora started as early as in the Late Cretaceous and took place during periods of climatic cooling, when new types of forest evolved and spread in the Northern Hemisphere. Arctic-alpine species of the genus appear to be of considerable age, dating back to the Late Eocene-Oligocene climatic cooling. By using calibrated phylogenies of epiphytic lichens it may become possible to date many paleoenvironmental events, for which little fossil evidence exists.

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