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Very rare species are not considered axiophytes; for a species to be a useful indicator of quality habitat it must be relatively frequent in those habitats, but scarce elsewhere. A typical example would be dog's mercury (Mercurialis perennis), a plant slow to colonise new sites, but common in ancient woodland and old hedgerows.
Blossom of lesser celandine (Ficaria verna) Penduculate oak trees in Wistman's Wood.. The concept of ancient woodland, characterised by high plant diversity and managed through traditional practices, was developed by the ecologist Oliver Rackham in his 1980 book Ancient Woodland, its History, Vegetation and Uses in England, which he wrote following his earlier research on Hayley Wood in ...
Allium ursinum, known as wild garlic, ramsons, cowleekes, cows's leek, cowleek, buckrams, broad-leaved garlic, wood garlic, bear leek, Eurasian wild garlic or bear's garlic, is a bulbous perennial flowering plant in the amaryllis family Amaryllidaceae. It is native to Europe and Asia, where it grows in moist woodland. [2]
In Britain Tilia cordata, traditionally called pry, is considered an indicator of ancient woodland, and is becoming increasingly rare. [9] Owing to its rarity, a number of woods have been given SSSI status. Cocklode Wood, part of the Bardney Limewoods in Lincolnshire, is the best surviving spread of medieval small leaved limes in England. [10]
Some epiphytic lichen species may be used as "ancient woodland indicators"; they can used to quantitatively assess the degree to which a forest has had a long history of canopy continuity. [11] The presence of these species is a reliable indicator that the forest has existed back to early medieval times, without being clear-cut and regrown
The antiquity of the woodlands is reflected in the very high number of ancient woodland indicator species recorded within the site. Over fifty such species occur, including a number of rare or local plants such as tutsan (Hypericum androsaemum) making it one of the botanically richest woods in Hampshire. [1]
The plant is an ancient woodland indicator, as the ants rarely carry the seeds more than a few yards, seldom crossing a field to go to a new woodland. The Latin specific epithet pratense means "of meadows". [2] Melampyrum pratense is a food plant of the caterpillars of the heath fritillary (Melitaea athalia), a butterfly. [3]
There is also an extraordinary range of geophytes, the plants that have bulbs or bulbous growths that make them especially adapted to woodland. These include the ancient woodland indicators of lily-of-the-valley, herb paris and ramsons, but also the uncommon in angular Solomon'-seal (Polygonatum odoratum) as well as the common in bluebells ...