Sphenopteris

Lycophyte

Carboniferous-Permian

Part of the stem of the fossil lycopod Sigillaria (a lycophyte). The external texture shows the former positions of the leaf bases. Sporangia were borne on the stem surface amongst them. The figured stem fragment is 6 cm in length.

Sphenopteris Fossil

Pteridophyte Devonian-Permian

Part of the foliage of the extinct fern Sphenopteris (a pteridophyte). Fronds have distinctive lobed pinnules. The figured section of frond is 6 cm in length.

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