Alethopteris sp.

ISM 15120b
coin = 19mm (~0.75 in.)

Alethopteris sp. is the foliage of a seed fern.

Seed ferns (Pteridospermales) are an extinct group of gymnosperms. Although their foliage resembled that of modern ferns, they reproduced by means of seeds. Their seeds were up to 4 cm (1.5 inches) in length.

This variety of seed fern was a small tree and may have stood about four meters (13 feet) tall.

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