
Many people get confused identifying ferns but the 2 species shown here and photographed today are very widespread and fairly common throughout Eastern North America and Europe and easily identified.
Damp shaded walls will often be showing seedlings in mortar cracks, which will not have grown seed cases yet.
A.ruta muraria L. ( a very rare case of a double worded specific name) or Wall Rue, refers to the similarity of the leaves to the herbal plant , Rue , which is actually related to the Buttercups. Wall Rue has historically been used as a specific for scrofula - a form of tuberculosis characterized by festering abscesses and swelling of the lymph glands in the neck.

The bright yellow green Maidenhair Spleenwort with darak brown almost black leaf stalks is also known by other common names including Asplénium rue-de-muraille (Fr.) , Seinäraunioinen (Fin.), Zanokcica murowa (Pol.) ,Ruda de muros (Sp.) Mauer-Streifenfarn (Ger.), Murruta (Sw.) Murruda (Den.)
Common names for A. trichomanes L. include Doradille Chevelue (Qué), Svartbräken, Bergspring, Stenbräken, Vanlig Svartbräken (Swe), Svartburkne (Nor), Rundfinnet Radeløv (Dan), Tummaraunioinen (Fin), Brauner Streifenfarn (Ger), Aranyos Fodorka (Hun) which relate to the belief that, because they grow in cracks in rocks and walls, thei roots penetrate and break the stone.
Maidenhair refers to the tufts of curled, black, dried leafless stalks left in the winter.
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