Pteris multifida Poiret (E-As.) – A very rare garden escape, known at least since 2001 from the basement (ruins) of the former Military Hospital in Berchem (Antwerpen). Here well established and more or less naturalised. From 2005 onwards found on several nearby basement walls (Zurenborg-quarter). Similar records from neighbouring countries are available for the British Isles (Edgington 2006, Crouch & Rumsey 2007), Germany (Radkowitsch 2008) and the Netherlands (Verloove & al. 2007).
Selected literature:
Crouch H.J. & Rumsey F. (2007) Discovery of Pteris multifida Poir. in Bath. BSBI News 104: 42-43.
Edgington J.A. (2006) Wall-to-wall ferns. BSBI News 102: 20-21.
Mazumdar J. & Arana M.D. (2016) Typification of the name Pteris multifida (Pteridaceae subfamily Pteridoideae). Phytotaxa 261: 199-200.
Radkowitsch A. (2008) Bemerkenswerte Adventivpflanzen am Florentinerberg in Baden-Baden (Südwestdeutschland). Carolinea 66: 5-10.
Riefner R.E. Jr. & Smith A.R. (2016) Pteris multifida (Pteridaceae) rediscovered in southern California (U.S.A.), with a key to species and notes on escaped cultivars. J. Bot. Res. Inst. Texas 10(2): 517-525. [available online at: http://www.brit.org/brit-press/jbrit/current]
Verloove F., van der Ham R. & Denters T. (2007) Exotische muurvarens in België en Nederland. Dumortiera 92: 1-16.