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Description: | The petal-like leaves of Annularia grew on slender shoots of Calamites stems. The leaves grew at joints in the stem, an arrangement that is typical of horsetails. Carboniferous varieties of these plants included trees that grew up to 30m tall and had trunks up to 1m in diameter. They often formed thickets along the edges of rivers and lakes in the tropical coal forests. Horsetails reproduced from spores that grew in cases (sporangia) arranged in cones attached to the tips of stems. | License: | http://www.imagine.org.uk/about/copyright/ | Rights holder: | Tyne & Wear Museums | Subjects: | fossils natural world | Source: | Tyne and Wear Imagine | Identifier: | http://www.imagine.org.uk/details/index.... | Go to resource |
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