Figures

Figure 18.10   Giant Carboniferous horsetails: (a) Calamites, a 10 m-tall tree; (b) Annularia, portion of a terminal shoot bearing 10 mm-long leaves; and (c) Palaeostachya, diagrammatic cross-section of a cone-like structure, 15 mm in diameter, bearing small numbers of megaspores. (Based on Thomas & Spicer 1987.)

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