Origin and Radiation of the Earliest Vascular Land Plants

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Science  17 Apr 2009:
Vol. 324, Issue 5925, pp. 353
DOI: 10.1126/science.1169659

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  1. Fig. 1.

    (A) Ordovician to Lower Devonian time scale. Black bar represents the studied interval. Stratigraphic position of 1, the oldest cryptospores; 2, the oldest mesofossils of sporangia containing cryptospores; 3, the previous oldest laevigate trilete spores from Turkey; 4, the previous oldest ornamented trilete spores; 5, the oldest megafossils of the vascular plant lineage; and 6, the oldest vascular plant megafossils with preserved conducting tissues. (B to I) Fossil trilete spores from the Qusaiba-1 corehole. Descriptions of spores provided in (7). Scale bars indicate 10 μm.