Alethopteris lancifolia Wagner, a rare element of the lower Westphalian “Fern Ledges” of Atlantic Canada

Resumen

Description of a plant impression from the lower Westphalian (Langsettian) “Fern Ledges” at Saint John, New Brunswick, and identification with Alethopteris lancifolia Wagner, a European species of the same general age. Comparison is made with similar species.