30cm in length.
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I hate to be picky(actually family might disagree there!) but it should be hart's tongue, as in the old terminology for deer.As in the hymn 'As pants the hart by something stream'.Which makes more sense looking at the shape of the frond.
apologies didn't pick up on spelling. dyslexic.
Lat/Lng: 50.422621376227, -3.8651382923126
OS grid ref: SX676597
Very old stone wall