| In fact, the whisk ferns and ophioglossoid ferns are demonstrably a clade, and the horsetails and Marattiaceae are arguably another clade. |
| Gymnosperms, including conifers, gingkoes, and cycads, were very numerous, as were ferns and horsetails. |
| The latter group comprises the archaeocalamites, calamites, and horsetails. |
| On land, the vegetation generally consisted of conifers, cycads, ginkgos, ferns and horsetails. |
| Ginkgo trees, conifers, bennettites, horsetails, ferns and cycads were plentiful during this period. |
| I've been studying them, wondering at the diet of the bear, how he can sustain himself on grasses and what appear to be shoots of thimbleberry and primeval horsetails. |
