This is a very short, perennial plant which is extremely difficult to spot – until you see the first one – after that it's easy! It only reaches about 10cm high, has one upright, oval, green leaf which partly surrounds an upright spike. The spores, by which the plant reproduces, are contained in this spike which itself grows taller than the solitary leaf. The photograph is of a young Adder's Tongue, the spike still smaller than the leaf. It is quite abundant in parts of the Burren and frequently found throughout the country, best looked for from May to July, is a native plant and belongs to the family Ophioglossaceae.
I first recorded (and photographed) this plant growing in the Raven Nature Reserve, Co Wexford in May, 2008. Christopher Wilson of the Wexford Naturalists Field Club had kindly told me where I might find it and he was absolutely right.
If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre