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Genera of Vascular Plants. 1+ vol. Berlin etc. Vol. 1, pp. 52--56. Reichstein, T. 1981. Hybrids in European Aspleniaceae (Pteridophyta). Bot. Helv. 91: 89--139

Asplenium ruta-muraria with various taxa are known from Europe (T. Reichstein 1981), but only three are known from North America, all exceedingly rare