Swain's Wood
Also within
Condition (Natural England)
| Unit | Feature | Condition | Area (ha) | Assessed |
|---|---|---|---|---|
| SU738920 | — | Favourable | 10.5 | 2010-02-19 |
| SU739920 | — | Favourable | 2.43 | 2019-09-26 |
| SU740921 | — | Favourable | 3.65 | 2010-02-19 |
Habitats
Geology & landscape
Rock Type: Chalk
Description
Description The site occupies the upper stretches of a classic dry valley and contains chalk grassland and scrub, flanked on two sides by woodland. The grassland is exceptionally rich in both plant and invertebrate species and several national rarities are present. The woodlands are unusual for the Chilterns in that, although some beech is present, there are parts where a more mixed canopy prevails. Upright brome grass Bromus erectus dominates the grassland which contains numerous typical chalkland species such as sheep's fescue Festuca ovina, salad burnet Poterium sanguisorba and horseshoe vetch Hippocrepis comosa. In shorter turf Chiltern gentian Gentianella germanica, yellow wort Blackstonia perfoliata, common centaury Centaurium erythraea, bee orchid Ophrys apifera and carline thistle Carlina vulgaris are characteristic. Ranker patches of grassland contain tall oat grass Arrhenatherum elatius, hedge bedstraw Galium album and marjoram Origanum vulgare. Among existing and recently cleared scrub, as well as along the wood edges, wood false brome Brachypodium sylvaticum is common and here fly and fragrant orchids Ophrys insectifera and Gymnadenia conopsea occur. The scrub itself is quite varied and includes dogwood Cornus sanguinea, privet Ligustrum vulgare, dewberry Rubus caesius and briars Rosa canina, Rosa arvensis and R. rubiginosa. The woodlands, which appear to be ancient, are represented in parts by classic Chiltern beech woods of both chalk slopeand clay plateau types, here rather poor in ground flora, but including bracken Pteridium aquilinum and several other ferns Dryopteris filix-mas, Dryopteris dilatata and Athyrium filix-femina. Beech is relatively scarce and ash predominates both in the main canopy and in the understorey, with wild cherry, birch, wych elm, holly, yew, field maple, rowan, whitebeam, sycamore and hornbeam. Here there is richer ground flora, including wood sorrel Oxalis acetosella, yellow archangel Lamiastrum galeobdolon, dog's mercury Mercurialis perennis, woodruff Galium odoratum, herb Robert Geranium robertianum, nettle leaved bellflower Campanula trachelium, wood spurge Euphorbia amygdaloides and primrose Primula vulgaris. The mosaic of short and taller grassland, with its favourable aspect and shelter from the adjacent woods, has enabled an exceptionally rich invertebrate fauna to develop, with some 117 species of spider and over 160 species of butterfly and moth having been recorded. Of the spiders, Tapinocyboides pygmaea and Phrurolithus minimums are Red Data Book * species and the purse web spider Atypus affinis is one of nine further rarities. Notable lepidoptera include the Duke of Burgundy fritillary Hamearis lucina and the beautiful brocade, Blomer's rivulet and water carpet moths Lanconobia continua, Venusia blomeri and Lampropteryx suffumata. The fauna of the woodlands warrants closer study, but includes the local snail bee Osmia bicolor which nests in dead snail shells. * The Red Data Book documents those species that are rare or threatened in great Britain.
Species mentioned
Show the 37 species mentioned in the description, with red-list statusPlant communities
W20 — Montane scrub
Salix lapponum-Luzula sylvatica scrub
Show 107 indicator speciesSalix 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
Show 81 indicator speciesHedera 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
Show 49 indicator speciesHedera 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
W23 — Brownfield, Hedgerow scrub
Ulex europaeus-Rubus fruticosus scrub
Show 40 indicator speciesHedera helix, Calluna vulgaris, Cytisus scoparius, Ulex europaeus, Kindbergia praelonga, Pseudoscleropodium purum, Rhytidiadelphus squarrosus, Rhytidiadelphus triquetrus, Achillea millefolium, Crepis capillaris, Hypochaeris radicata, Jacobaea vulgaris, Campanula rotundifolia, Jasione montana, Cerastium fontanum, Silene dioica, Teucrium scorodonia, Digitalis purpurea, Plantago lanceolata, Veronica chamaedrys, Veronica officinalis, Rumex acetosa, Rumex acetosella, Potentilla erecta, Rubus fruticosus agg., Rubus idaeus, Galium saxatile, Viola riviniana, Agrostis capillaris, Aira praecox, Anthoxanthum odoratum, Arrhenatherum elatius, Brachypodium sylvaticum, Dactylis glomerata, Deschampsia flexuosa, Festuca rubra, Holcus lanatus, Holcus mollis, Poa pratensis, Pteridium aquilinum
W25 — Bracken scrub
Pteridium aquilinum-Rubus fruticosus underscrub
Show 53 indicator speciesHedera helix, Acer pseudoplatanus, Fagus sylvatica, Quercus robur, Fraxinus excelsior, Sambucus nigra, Ulex europaeus, Crataegus monogyna, Prunus spinosa, Luzula multiflora, Mnium hornum, Brachythecium rutabulum, Kindbergia praelonga, Angelica sylvestris, Conopodium majus, Heracleum sphondylium, Arum maculatum, Cirsium arvense, Lonicera periclymenum, Silene dioica, Stellaria holostea, Mercurialis perennis, Geranium robertianum, Glechoma hederacea, Teucrium scorodonia, Hyacinthoides non-scripta, Chamerion angustifolium, Circaea lutetiana, Digitalis purpurea, Rumex acetosa, Anemone nemorosa, Ficaria verna, Potentilla erecta, Rosa arvensis, Rosa canina, Rubus fruticosus agg., Rubus idaeus, Galium aparine, Galium mollugo sens.lat., Galium saxatile, Urtica dioica, Viola riviniana, Agrostis capillaris, Anthoxanthum odoratum, Arrhenatherum elatius, Dactylis glomerata, Festuca rubra, Holcus lanatus, Holcus mollis, Poa trivialis, Pteridium aquilinum, Dryopteris dilatata, Dryopteris filix-mas