thriving in a drain
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Ther might be three different species of fern in this picture - one possibly Asplenium trichomanes - are you are limestone there?
no there is no limestone here.its oxford clay which is slightly alkaline i think.
... is Asplenium scolopendrium, but Asplenium trichomanes seems likely, and the 3rd (and 4th?) may be a species of Dryopteris.
Lat/Lng: 52.5, -0.3
OS grid ref: TL2094