Hollingbourne Downs

Site of Special Scientific Interest · 51.2741, 0.6438

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Kent County Kent Downs Scenic Area North Downs Way National Trail

Condition (Natural England)

Favourable (9) Unfavourable No Change (1)
UnitFeatureConditionArea (ha)Assessed
TQ841562 — Favourable 8.03 2021-02-11
TQ841564 — Favourable 5.1 2021-02-11
TQ844562 — Favourable 2.85 2021-11-05
TQ845560 — Favourable 5.17 2021-02-11
TQ846557 — Favourable 5.2 2021-07-26
TQ849558 — Favourable 4.96 2021-07-26
TQ850558 — Favourable 2.16 2021-07-26
TQ853552 — Favourable 1.74 2021-02-11
TQ855554 — Favourable 1.51 2021-02-11
TQ856553 — Unfavourable No Change 24.22 2021-02-11

Habitats

Beech wood, Coppiced woodland, Mixed scrub, Montane scrub

Geology & landscape

Mining / Industrial: Quarry · Rock Type: Chalk

Description

Description This section of the North Downs escarpment supports a variety of habitats characteristic of calcareous soils, including unimproved chalk grassland and beech woodland with oak and ash. A number of plant species indicative of the chalk soils are present, including the rare mat grass fescue Vulpia unilateralis, musk orchid Herminium monorchis and man orchid Orchis anthorpophora. Chalk grassland overlies the steeper slopes of the escarpment and has become established in disused chalk workings. The sward is dominated by tor grass Brachypodium pinnatum, upright brome Bromus erectus and sheep's fescue Festuca ovina and a number of typical downland herbs are present. These include horseshoe vetch Hippocrepis comosa, salad burnet Poterium sanguisorba and dwarf thistle Cirsium acaule. Less common plants which occur include chalk milkwort Polygala calcarea and, in an old chalk pit, musk orchid and man orchid. In a chalk quarry, whitebeam and yew scrub has developed over a herb rich turf which includes the very rare mat grass fescue. Elsewhere in the site, areas of scrub are chiefly of hawthorn and elder, over a sward of tor grass. The scrub is most dense on the heavier soils at the top of the scarp. Much of the south eastern part of the site comprises mixed deciduous woodland. On the plateau, sweet chestnut coppice with standards of pedunculate oak, ash and sycamore merges with an extensive area of very large hawthorn at the top of the slope. There is some secondary woodland of ash and yew and on the steeper escarpment slopes beech high forest is present with some hazel coppice. The understorey and ground flora of much of the woodland is sparse, although in secondary woodland areas and on woodland edges several shrub species indicative of calcareous soils are present. These include wayfaring tree Viburnum lantana, dogwood Cornus sanguinea and traveller's joy Clematis vitalba. The ground flora is generally dominated by dog's mercury Mercurialis perennis, with bluebell Hyacinthoides non-scripta on the heavier soils. Less common species present include white helleborine Cephalanthera damasonium and fly orchid Ophrys insectifera, which are found on the thin chalky soils of the steeper slopes. At the western end of the site there are some small areas of woodland dominated by pedunculate oak and ash with an understorey mainly of hawthorn and elder. Purging buckthorn Rhamnus cathartica is also present, indicative of the chalk soils.

Species mentioned

English name
search for this in other sites		 Latin name
search with Google		 IUCN / Red List Type Family
tor grass Brachypodium pinnatum LC grass poaceae
upright brome Bromus erectus Not listed in GB list grass poaceae
sheep's fescue Festuca ovina LC grass poaceae
mat grass fescue Vulpia unilateralis Not listed in GB list grass poaceae
white helleborine Cephalanthera damasonium LC herb orchidaceae
dwarf thistle Cirsium acaule VU herb asteraceae
musk orchid Herminium monorchis EN herb orchidaceae
horseshoe vetch Hippocrepis comosa VU herb fabaceae
bluebell Hyacinthoides non-scripta LC herb liliaceae
dog's mercury Mercurialis perennis LC herb euphorbiaceae
fly orchid Ophrys insectifera VU herb orchidaceae
man orchid Orchis anthorpophora Not listed in GB list herb orchidaceae
chalk milkwort Polygala calcarea VU herb polygalaceae
salad burnet Poterium sanguisorba VU herb rosaceae
traveller's joy Clematis vitalba LC shrub ranunculaceae
dogwood Cornus sanguinea LC shrub cornaceae
buckthorn Rhamnus cathartica LC shrub rhamnaceae
wayfaring tree Viburnum lantana LC shrub caprifoliaceae

Plant communities

W12 — Beech wood

Fagus sylvatica-Mercurialis perennis woodland

Hedera helix, Acer pseudoplatanus, Ilex aquifolium, Betula pendula, Betula pubescens, Carpinus betulus, Corylus avellana, Fagus sylvatica, Quercus robur, Aesculus hippocastanum, Fraxinus excelsior, Prunus avium, Sorbus aria, Taxus baccata, Ulmus glabra, Buxus sempervirens, Sambucus nigra, Viburnum lantana, Viburnum opulus, Euonymus europaeus, Cornus sanguinea, Ligustrum vulgare, Clematis vitalba, Crataegus monogyna, Daphne laureola, Carex flacca, Carex sylvatica, Mnium hornum, Plagiomnium undulatum, Fissidens taxifolius, Brachythecium rutabulum, Kindbergia praelonga, Thamnobryum alopecurum, Tamus communis, Anthriscus sylvestris, Heracleum sphondylium, Sanicula europaea, Arum maculatum, Arctium minus, Mycelis muralis, Solidago virgaurea, Cynoglossum officinale, Alliaria petiolata, Campanula trachelium, Lonicera periclymenum, Silene dioica, Euphorbia amygdaloides, Mercurialis perennis, Geranium robertianum, Hypericum hirsutum, Iris foetidissima, Ajuga reptans, Glechoma hederacea, Lamiastrum galeobdolon, Stachys sylvatica, Teucrium scorodonia, Allium ursinum, Hyacinthoides non-scripta, Chamerion angustifolium, Circaea lutetiana, Epilobium montanum, Cephalanthera damasonium, Neottia nidus-avis, Neottia ovata, Veronica chamaedrys, Rumex sanguineus, Anemone nemorosa, Ficaria verna, Ranunculus bulbosus, Fragaria vesca, Geum urbanum, Rosa canina, Rubus fruticosus agg., Galium aparine, Galium mollugo sens.lat., Galium odoratum, Urtica dioica, Viola riviniana, Anisantha sterilis, Arrhenatherum elatius, Brachypodium sylvaticum, Bromopsis ramosa, Dactylis glomerata, Deschampsia cespitosa, Melica uniflora, Milium effusum, Poa nemoralis, Poa trivialis, Asplenium scolopendrium, Dryopteris dilatata, Dryopteris filix-mas

W14 — Beech wood, Wood pasture

Fagus sylvatica-Rubus fruticosus woodland

Hedera helix, Salix caprea, Acer pseudoplatanus, Ilex aquifolium, Betula pendula, Betula pubescens, Corylus avellana, Fagus sylvatica, Quercus robur, Fraxinus excelsior, Pinus sylvestris, Prunus avium, Sorbus aria, Sorbus aucuparia, Taxus baccata, Ulmus glabra, Sambucus nigra, Ruscus aculeatus, Ligustrum vulgare, Carex remota, Carex sylvatica, Luzula pilosa, Mnium hornum, Dicranella heteromalla, Dicranum scoparium, Fissidens taxifolius, Brachythecium rutabulum, Hypnum cupressiforme, Isothecium myosuroides, Kindbergia praelonga, Plagiothecium denticulatum, Plagiothecium undulatum, Pseudotaxiphyllum elegans, Thuidium tamariscinum, Atrichum undulatum, Polytrichum commune, Polytrichum formosum, Arum maculatum, Lonicera periclymenum, Moehringia trinervia, Stellaria media agg., Euphorbia amygdaloides, Mercurialis perennis, Hypericum pulchrum, Lamiastrum galeobdolon, Hyacinthoides non-scripta, Circaea lutetiana, Epipactis helleborine, Oxalis acetosella, Digitalis purpurea, Anemone nemorosa, Ranunculus repens, Geum urbanum, Rubus fruticosus agg., Rubus idaeus, Galium odoratum, Galium verum, Urtica dioica, Viola riviniana, Agrostis capillaris, Agrostis stolonifera, Brachypodium sylvaticum, Bromopsis ramosa, Dactylis glomerata, Deschampsia cespitosa, Deschampsia flexuosa, Holcus lanatus, Holcus mollis, Melica uniflora, Milium effusum, Poa nemoralis, Poa trivialis, Schedonorus giganteus, Pteridium aquilinum, Dryopteris dilatata, Dryopteris filix-mas

W15 — Beech wood, Wood pasture

Fagus sylvatica-Deschampsia flexuosa woodland

Hedera helix, Acer pseudoplatanus, Ilex aquifolium, Betula pendula, Betula pubescens, Fagus sylvatica, Quercus hybrid, Quercus petraea, Quercus robur, Pinus sylvestris, Sorbus aucuparia, Taxus baccata, Calluna vulgaris, Rhododendron ponticum, Vaccinium myrtillus, Ruscus aculeatus, Carex pilulifera, Luzula pilosa, Luzula sylvatica, Mnium hornum, Orthodontium lineare, Dicranella heteromalla, Dicranum scoparium, Leucobryum glaucum, Hylocomium splendens, Hypnum cupressiforme, Kindbergia praelonga, Plagiothecium undulatum, Pseudotaxiphyllum elegans, Rhytidiadelphus loreus, Thuidium tamariscinum, Polytrichum formosum, Tetraphis pellucida, Calypogeia fissa, Diplophyllum albicans, Gymnocolea inflata, Lepidozia reptans, Cladonia fimbriata, Cladonia squamules, Lonicera periclymenum, Hyacinthoides non-scripta, Chamerion angustifolium, Oxalis acetosella, Rubus fruticosus agg., Melanpyrum pratense, Agrostis capillaris, Deschampsia flexuosa, Holcus lanatus, Holcus mollis, Molinia caerulea, Poa nemoralis, Blechnum spicant, Pteridium aquilinum, Dryopteris dilatata

W20 — Montane scrub

Salix lapponum-Luzula sylvatica scrub

Salix arbuscula, Salix cinerea, Salix lapponum, Salix myrsinites, Salix phylicifolia, Salix reticulata, Empetrum nigrum, Calluna vulgaris, Salix lanata, Vaccinium myrtillus, Vaccinium uliginosum, Carex atrata, Carex bigelowii, Carex binervis, Carex flacca, Luzula multiflora, Luzula sylvatica, Huperzia selago, Selaginella selaginoides, Aulacomnium palustre, Mnium hornum, Philonotis fontana, Plagiomnium undulatum, Rhizomnium punctatum, Dicranum bonjeanii, Dicranum majus, Dicranum scoparium, Fissidens adianthoides, Racomitrium lanuginosum, Calliergonell cuspidatum, Ctenidium molluscum, Hylocomium splendens, Hypnum callichroum, Hypnum cupressiforme, Palustriella commutatum, Plagiothecium denticulatum, Plagiothecium undulatum, Pleurozium schreberi, Ptilium crista-castrensis, Rhytidiadelphus loreus, Rhytidiadelphus squarrosus, Rhytidiadelphus triquetrus, Sanionia uncinata, Scorpidium revolvens, Thuidium tamariscinum, Atrichum undulatum, Polytrichastrum alpinum, Sphagnum capillifolium, Sphagnum fallax, Sphagnum girgensohnii, Sphagnum palustre, Sphagnum russowii, Sphagnum squarrosum, Sphagnum subnitens, Sphagnum teres, Barbilophozia barbata, Chiloscyphus polyanthos, Diplophyllum albicans, Lophocolea bidentata, Plagiochila porelloides, Ptilidium ciliare, Scapania undulata, Cladonia squamosa, Peltigera canina, Angelica sylvestris, Caltha palustris, Hieraclium spp., Saussurea alpina, Solidago virgaurea, Campanula rotundifolia, Succisa pratensis, Valeriana officinalis, Rhodiola rosea, Vaccinium vitis-idaea, Thymus praecox, Epilobium anagallidifolium, Dactylorhiza viridis, Euphrasia officinalis, Rhinanthus minor, Oxalis acetosella, Oxyria digyna, Polygonum viviparum, Rumex acetosa, Anemone nemorosa, Ranunculus acris, Thalictrum alpinum, Alchemilla alpina, Alchemilla glabra, Filipendula ulmaria, Geum rivale, Galium boreale, Galium saxatile, Saxifraga aizoides, Saxifraga hypnoides, Saxifraga oppositifolia, Saxifraga stellaris, Viola riviniana, Agrostis canina, Agrostis capillaris, Anthoxanthum odoratum, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Festuca rubra, Nardus stricta, Dryopteris dilatata, Phegopteris connectilis

W21 — Hedgerow scrub, Mixed scrub

Crataegus monogyna-Hedera helix scrub

Hedera helix, Salix cinerea, Acer pseudoplatanus, Ilex aquifolium, Betula pendula, Corylus avellana, Fagus sylvatica, Quercus robur, Fraxinus excelsior, Malus sylvestris, Sorbus aria, Taxus baccata, Ulmus glabra, Ulmus procera, Sambucus nigra, Viburnum lantana, Euonymus europaeus, Cornus sanguinea, Juniperus communis, Ligustrum vulgare, Clematis vitalba, Rhamnus cathartica, Crataegus laevigata, Crataegus monogyna, Prunus spinosa, Juncus effusus, Plagiomnium undulatum, Brachythecium rutabulum, Kindbergia praelonga, Rhynchostegium confertum, Tamus communis, Heracleum sphondylium, Torilis japonica, Arum maculatum, Arctium minus, Cirsium arvense, Lonicera periclymenum, Moehringia trinervia, Silene dioica, Stellaria graminea, Stellaria holostea, Stellaria media agg., Calystegia sepium, Mercurialis perennis, Geranium robertianum, Iris foetidissima, Glechoma hederacea, Lamium purpureum, Origanum vulgare, Stachys sylvatica, Teucrium scorodonia, Allium ursinum, Hyacinthoides non-scripta, Circaea lutetiana, Rumex sanguineus, Anemone nemorosa, Ranunculus repens, Fragaria vesca, Geum urbanum, Potentilla sterilis, Poterium sanguisorba, Rosa arvensis, Rosa canina, Rubia peregrina, Rubus fruticosus agg., Galium aparine, Urtica dioica, Viola riviniana, Anisantha sterilis, Arrhenatherum elatius, Brachypodium pinnatum, Brachypodium sylvaticum, Bromopsis erecta, Dactylis glomerata, Elytrigia repens, Holcus lanatus, Holcus mollis, Poa trivialis, Asplenium scolopendrium, Pteridium aquilinum, Dryopteris filix-mas

W22 — Hedgerow scrub, Mixed scrub

Prunus spinosa-Rubus fruticosus scrub

Hedera helix, Acer campestre, Corylus avellana, Ulex europaeus, Prunus spinosa, Plagiomnium undulatum, Brachythecium rutabulum, Eurhynchium striatum, Kindbergia praelonga, Thuidium tamariscinum, Atrichum undulatum, Lophocolea bidentata, Achillea millefolium, Cardamine flexuosa, Lonicera periclymenum, Moehringia trinervia, Silene dioica, Silene uniflora, Stellaria media agg., Mercurialis perennis, Geranium robertianum, Stachys sylvatica, Teucrium scorodonia, Hyacinthoides non-scripta, Oxalis acetosella, Digitalis purpurea, Plantago lanceolata, Veronica chamaedrys, Armeria maritima, Rumex acetosa, Filipendula ulmaria, Geum urbanum, Rosa canina, Rubus fruticosus agg., Rubus idaeus, Galium aparine, Urtica dioica, Viola riviniana, Agrostis capillaris, Brachypodium sylvaticum, Dactylis glomerata, Festuca rubra, Holcus lanatus, Holcus mollis, Poa trivialis, Asplenium scolopendrium, Pteridium aquilinum, Dryopteris borreri, Dryopteris filix-mas