Adiantum capillus-veneris L. (subtrop., warm-temp. regions of the world) – An exceptional escape from cultivation, known since 2001 on damp walls in the ruins of the former Military Hospital in Berchem (Antwerpen). Discovered in 2007 in abundance in Deurne-Noord (Antwerpen) on several basement walls (confirmed in 2009, after the severe winter 2008-2009). At present much less cultivated than Adiantum raddianum and likely to be confused with it.
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Literature:
Edgington J.A. (2005) Exotic ferns on London walls. BSBI News 100: 42-44. [available online at: http://archive.bsbi.org.uk/BSBINews100.pdf]
Van der Ham R. & Verloove F. (2002) Venusharen in België en Nederland. Gorteria 28: 139-141. [available online at: http://repository.naturalis.nl/document/567444]