Area: 48.0 hectares.

Description and Reasons for Notification:

Whiddon Deer Park is a pasture woodland with an exceptionally diverse lichen flora and a rich invertebrate fauna. Many nationally-rare species are present. 

Lying on the north-eastern edge of Dartmoor at an altitude of 130–240 metres, the park occupies the floor and steep west-facing slope of a valley above a stream feeding into the nearby River Teign. It is underlain by granite which outcrops frequently and has led to the formation of acid soils. These are mostly well drained but springs give rise to a few boggy flushes down the valley side. 

Derived from and still retaining much of the original character of a medieval deer park, the site has many exceptionally large and old oak Quercus petraea, ash Fraxinus excelsior and beech Fagus sylvatica trees. Interspersed among these, unusually so for ancient pasture woodland, are many younger frees, mainly oak, but including birch Betula spp., holly Ilex aquifolium, willow Salix spp. and hawthorn Crataegus monogyna. The ground flora is largely dominated by fescue Festuca spp. and bent Agrostis spp. grassland together with bracken Pteridium aquilinum. Rushes Juncus spp., purple moor-grass Molinia caerulea and greater tussock-sedge Carex paniculata occur in the flushes. The park is now grazed by cattle and sheep. 

Altogether some 235 lichen species have been recorded from the park, 40 of these indicative of long-term ecological continuity, an exceptionally high number. The most diverse lichen communities occur on the ancient trees, especially oak and ash pollards, but the granite rocks also support a rich saxicolous flora. Overall the lichen flora is of particular interest because many of the species present are more typical of eastern Britain or the continent. These include Arthonia impolitaChaenotheca brunneolaC. hispidulaCyphelium inquinans andLecanactis lyncea. However, some species characteristic of the high rainfall and oceanic conditions that prevail in Devon are also present, such as Parmelia laevigataNephroma laevigatumLobaria pulmonaria and Sphaerophorum globosus

Ramonia nigra, which is known from only one other site in Britain, is among the many rare lichen species recorded. Others include Schismatomma graphidioidesLecania cyrtellinaCollema furfuraceum and Wadeana dendrographa, and three species that are all very local in southwest England, Anaptychia ciliarisLecanactis amylacea and Parmeliella plumbea

The park is unusual for a pasture woodland in also having an interesting moss flora. Primarily associated with old ash trees, this flora includes two nationally scarce species, Leucodon sciuroides and Zygodon rupestris, and two that are uncommon in southern Britain, Orthotrichum lyellii and Pterigonium gracile

The old trees support a rich community of insects, mainly associated with their dead wood. This community includes an endangered Red Data Book rove beetle, Velleius dilatatus, which lives on fly larvae in Hornet Vespa crabro nests. Another national rarity present is the long horn beetle Strangalia aurulenta, while nationally uncommon species recorded include a darkling beetle, Eledona aqricola, a soldier beetle Malthodes guttifer and a bark bug Xylocoris cursitans. A woodland solider fly, Xylophagus ater, is locally uncommon in England. 

The wet flushes are also rich in invertebrates. The nationally uncommon skullcap leaf beetle Phyllobrotica quadrimaculata has been found in them, as has the largest British slug, Limax cinereoniger, a very local species which is only found in ancient woods and pasture woodlands.