This is a fairly easy fern to find amongst the acid rocks of Cwm Idwal in Snowdonia and if I see this I tend to find Gymnocarpium dryopteris (Oak Fern) nearby as well. It is usually a bright green colour with the bottom two pinnae sticking out at an angle.
Cwm Idwal 25th July 2002
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Added on 15th November 2004, amended on January 30th 2005