Wormsley Chalk Banks
Condition (Natural England)
| Unit | Feature | Condition | Area (ha) | Assessed |
|---|---|---|---|---|
| SU729935 | — | Unfavourable Recovering | 0.23 | 2011-09-27 |
| SU735958 | — | Unfavourable Recovering | 3.55 | 2011-09-27 |
| SU737930 | — | Favourable | 1.69 | 2011-09-27 |
| SU745937 | — | Favourable | 0.59 | 2021-11-24 |
| SU747926 | — | Favourable | 4.34 | 2021-11-24 |
| SU750922 | — | Favourable | 4.36 | 2023-09-25 |
Habitats
Geology & landscape
Rock Type: Chalk
Description
Area, 14.1 hectares 34.9 ac Description The Wormsley Valley contains several tracts of species rich chalk grassland containing plant and invertebrate communities with species which have suffered a drastic decline nationally and which collectively form the Wormsley Chalk Banks SSSI. The banks, which overlie the middle and upper chalk, vary in their characteristics with a range of soil depths and aspects. Three distinct types of chalk grassland occur. The first, which includes parts of Gray's Lane and Richmore Hill Banks and in which the dominant grass is sheep's fescue Festuca ovina, contains the greatest variety of plants. These include quaking grass Briza media, salad burnet Poterium sanguisorba, thyme and large thyme Thymus polytrichus and Thymus polytrichus, small scabious Scabiosa columbaria and early purple, common spotted and pyramidal orchids Orchis mascula, Dactylorhiza fuchsii and Anacamptis pyramidalis which are all characteristic of chalk grassland. There are a number of local species including clustered bellflower Campanula glomerata, horseshoe vetch Hippocrepis comosa, squinancywort Asperula cynanchica and the nationally rare chalk eyebright Euphrasia pseudokerneri, as well as early and Chiltern gentians Gentianella anglica and G. germanica, the former gentian being only known from one other Buckinghamshire locality and the latter being very scarce outside the Chilterns where a few populations still survive. These swards which occur on the shallowest, most chalky soils, are probably among the most ancient of the Wormsley grasslands and are presently maintained by rabbits and deer. A second type of chalk grassland found within Gray's Lane, Lousy Hill, Richmore, Coombe and Vicars Farm Banks, on slightly deeper soils, have coarser grasses such as upright brome Bromus erectus, tall oat grass Arrhenatherum elatius and cock's foot Dactylis glomerata. These too contain a wealth of chalk flowers, but here the taller and more robust herbs are favoured such as greater and common knapweed Centaurea scabiosa and C. nigra, field scabious Knautia arvensis, marjoram Origanum vulgare, cowslip Primula veris, hawkweed oxtongue Picris hieracioides and wild parsnip Pastinaca sativa, together with species which are scarce in Buckinghamshire including creeping toadflax Linaria repens and vervain Verbena officinalis. Orchid species include bee and fly Ophrys apifera and Ophrys insectifera. The latter is becoming increasingly scarce in southern England. Phases of short lived arable cultivation, perhaps at the turn of the century, are responsible for a third type of sward where grasses are almost entirely absent and glaucous sedge Carex flacca is abundant, together with a predominance of low growing herbs including dwarf and carline thistles Cirsium acaule and Carlina vulgaris, yellow wort Blackstonia perfoliata, together with the locally rare fragrant orchid Gymnadenia conopsea, crested hair grass Koeleria macranthand wild candytuft Iberis amara, which is a nationally rare species. This type is represented on the southernmost part of Gray's Hill, Barnfield Hanging and small sections of several of the other banks. Whilst also posing a threat to the grassland through shading and eutrophication, the various scrub communities provide an important element in themselves, especially where they grow alongside woodland. A typically wide range of chalkland species occurs including hawthorn, blackthorn, dog rose, privet, dogwood, spindle and guelder rose. Of particular interest is the nationally rare mezereon Daphne mezereum. The variety of aspect, soil type and vegetation supports a rich invertebrate fauna including the butterflies marbled white, dingy skipper, chalkhill blue and dark green fritillary. A harvest spider Trogulus incarnatus, which is indicative of longevity of chalk grassland conditions, has also been recorded. Slow worm Anguis fragilis has also been recorded on Coombe Bank.
Species mentioned
Show the 34 species mentioned in the description, with red-list statusPlant communities
OV3 — Arable, Open habitat arable weed less fertile acid, Pond ditch and canal
Papaver rhoeas-Viola arvensis community
Show 52 indicator speciesBryum erythrocarpum, Phascum cuspidatum, Heracleum sphondylium, Achillea millefolium, Anthemis arvensis, Artemisia vulgaris, Cirsium arvense, Eupatorium cannabinum, Matricaria discoidea, Pulicaria dysenterica, Senecio vulgaris, Sonchus asper, Sonchus oleraceus, Taraxacum officianalis, Tripleurospermum inodorum, Anchusa arvensis, Myosotis arvensis, Arabidopsis thaliana, Capsella bursa-pastoris, Descurainia sophia, Sisymbrium officinale, Valerianella locusta, Arenaria leptoclados, Arenaria serpyllifolia, Silene latifolia, Spergula arvensis, Stellaria media agg., Chenopodium album, Convolvulus arvensis, Medicago lupulina, Trifolium repens, Vicia sativa, Geranium dissectum, Epilobium hirsutum, Papaver argemone, Papaver dubium, Veronica arvensis, Veronica persica, Veronica triphyllos, Fallopia convolvulus, Polygonum aviculare, Rumex crispus, Anagallis arvensis, Aphanes microcarpa, Galium aparine, Urtica dioica, Viola arvensis, Agrostis stolonifera, Elytrigia repens, Poa annua, Poa trivialis, Chara vulgaris
OV4 — Arable
Chrysanthemum segetum-Spergula arvensis community
Show 56 indicator speciesBryum rubens, Daucus carota, Artemisia vulgaris, Bellis perennis, Cirsium arvense, Cirsium vulgare, Crepis capillaris, Filaginella uliginosa, Glebionis segetum, Matricaria discoidea, Senecio vulgaris, Sonchus asper, Taraxacum officianalis, Tripleurospermum inodorum, Anchusa arvensis, Myosotis arvensis, Brassica rapa, Capsella bursa-pastoris, Lepidium didymum, Raphanus raphanistrum, Cerastium fontanum, Cerastium glomeratum, Spergula arvensis, Stellaria media agg., Euphorbia helioscopia, Trifolium dubium, Trifolium repens, Vicia sativa, Fumaria muralis, Geranium dissectum, Galeopsis tetrahit, Lamium purpureum, Stachys arvensis, Plantago major, Veronica agrestis, Veronica arvensis, Fallopia convolvulus, Persicaria maculosa, Polygonum aviculare, Rumex acetosella, Rumex crispus, Anagallis arvensis, Ranunculus repens, Potentilla anserina, Misopates orontium, Solanum nigrum, Viola arvensis, Agrostis capillaris, Agrostis stolonifera, Dactylis glomerata, Elytrigia repens, Holcus lanatus, Lolium multiflorum, Lolium perenne, Poa annua, Poa trivialis
OV7 — Arable, Open habitat arable weed fertile loam and clay
Veronica persica-Veronica polita community
Show 41 indicator speciesAethusa cynapium, Cirsium arvense, Conyza canadensis, Matricaria discoidea, Senecio vulgaris, Sonchus asper, Sonchus oleraceus, Tripleurospermum inodorum, Capsella bursa-pastoris, Diplotaxis muralis, Erucastrum gallicum, Lepidium coronopus, Sisymbrium officinale, Thlaspi arvense, Stellaria media agg., Atriplex patula, Atriplex prostrata, Chenopodium album, Euphorbia helioscopia, Euphorbia peplus, Lamium amplexicaule, Lamium hybridum, Lamium purpureum, Plantago lanceolata, Plantago major, Veronica persica, Veronica polita, Fallopia convolvulus, Polygonum aviculare, Anagallis arvensis, Ranunculus repens, Galium aparine, Solanum nigrum, Urtica urens, Viola arvensis, Agrostis stolonifera, Avena fatua, Elytrigia repens, Poa annua, Aphanes arvensis, Chara vulgaris
OV8 — Arable, Open habitat arable weed fertile loam and clay
Veronica persica-Alopecurus myosuroides community
Show 41 indicator speciesAethusa cynapium, Anthemis cotula, Cirsium arvense, Lapsana communis, Matricaria chamomilla, Matricaria discoidea, Senecio vulgaris, Sonchus arvensis, Sonchus asper, Sonchus oleraceus, Tripleurospermum inodorum, Capsella bursa-pastoris, Lepidium coronopus, Sinapis arvensis, Sisymbrium officinale, Stellaria media agg., Atriplex patula, Atriplex prostrata, Chenopodium album, Chenopodium hybridum, Convolvulus arvensis, Euphorbia helioscopia, Euphorbia peplus, Trifolium repens, Geranium dissectum, Lamium purpureum, Plantago major, Veronica persica, Fallopia convolvulus, Persicaria maculosa, Polygonum aviculare, Rumex crispus, Galium aparine, Solanum nigrum, Urtica dioica, Urtica urens, Alopecurus myosuroides, Avena fatua, Elytrigia repens, Poa annua, Chara vulgaris
OV9 — Arable, Open habitat arable weed fertile loam and clay
Matricaria perforata-Stellaria media community
Show 76 indicator speciesJuncus bufonius, Bryum rubens, Dicranella staphylina, Kindbergia praelonga, Barbula unguiculata, Phascum cuspidatum, Tortula intermedia, Riccia sorocarpa, Artemisia vulgaris, Cirsium arvense, Crepis capillaris, Filaginella uliginosa, Glebionis segetum, Lapsana communis, Matricaria discoidea, Senecio vulgaris, Sonchus arvensis, Sonchus asper, Taraxacum officianalis, Tripleurospermum maritimum, Tussilago farfara, Anchusa arvensis, Myosotis arvensis, Capsella bursa-pastoris, Raphanus raphanistrum, Sisymbrium officinale, Cerastium fontanum, Stellaria media agg., Atriplex patula, Atriplex prostrata, Chenopodium album, Equisetum arvense, Mercurialis annua, Trifolium pratense, Trifolium repens, Fumaria officinalis, Geranium molle, Galeopsis tetrahit, Lamium hybridum, Lamium purpureum, Chamerion angustifolium, Epilobium montanum, Papaver dubium, Plantago lanceolata, Plantago major, Veronica arvensis, Veronica persica, Fallopia convolvulus, Persicaria maculosa, Polygonum arenastrum, Polygonum aviculare, Rumex acetosella, Rumex crispus, Rumex obtusifolius, Anagallis arvensis, Ranunculus arvensis, Potentilla anserina, Sherardia arvensis, Misopates orontium, Solanum nigrum, Urtica dioica, Viola arvensis, Agrostis capillaris, Agrostis stolonifera, Anisantha sterilis, Arrhenatherum elatius, Dactylis glomerata, Elytrigia repens, Holcus lanatus, Holcus mollis, Hordeum vulgare, Lolium perenne, Poa annua, Poa trivialis, Aphanes arvensis, Chara vulgaris
OV10 — Arable, Open habitat arable weed fertile loam and clay
Poa annua-Senecio vulgaris community
Show 74 indicator speciesBryum argenteum, Heracleum sphondylium, Achillea millefolium, Anthemis cotula, Arctium minus, Cirsium arvense, Cirsium vulgare, Jacobaea vulgaris, Lapsana communis, Leucanthemum vulgare, Matricaria chamomilla, Matricaria discoidea, Senecio squalidus, Senecio vulgaris, Sonchus asper, Sonchus oleraceus, Taraxacum officianalis, Tripleurospermum inodorum, Tussilago farfara, Myosotis arvensis, Alliaria petiolata, Capsella bursa-pastoris, Erophila verna, Lepidium coronopus, Raphanus raphanistrum, Sinapis arvensis, Cerastium fontanum, Spergula arvensis, Stellaria media agg., Atriplex prostrata, Chenopodium album, Euphorbia exigua, Euphorbia helioscopia, Medicago lupulina, Trifolium pratense, Trifolium repens, Vicia sativa, Fumaria officinalis, Eriodium cicutarium, Lamium hybridum, Lamium purpureum, Chamerion angustifolium, Plantago lanceolata, Plantago major, Plantago media, Veronica arvensis, Veronica chamaedrys, Veronica persica, Veronica polita, Fallopia convolvulus, Persicaria maculosa, Polygonum arenastrum, Polygonum aviculare, Rumex acetosa, Rumex crispus, Rumex obtusifolius, Anagallis arvensis, Ranunculus repens, Galium aparine, Urtica dioica, Urtica urens, Viola arvensis, Agrostis capillaris, Agrostis stolonifera, Anisantha sterilis, Dactylis glomerata, Elytrigia repens, Festuca ovina, Holcus lanatus, Lolium perenne, Poa annua, Poa pratensis, Poa trivialis, Aphanes arvensis
OV11 — Arable, Open habitat arable weed fertile loam and clay
Poa annua-Stachys arvensis community
Show 61 indicator speciesBryum erythrocarpum, Dicranella staphylina, Pleuridium subulatum, Brachythecium rutabulum, Kindbergia praelonga, Tortula truncata, Daucus carota, Glebionis segetum, Matricaria discoidea, Scorzoneroides autumnalis, Senecio sylvaticus, Senecio vulgaris, Sonchus arvensis, Sonchus asper, Taraxacum officianalis, Tripleurospermum inodorum, Capsella bursa-pastoris, Lepidium didymum, Sinapis arvensis, Cerastium fontanum, Cerastium glomeratum, Spergula arvensis, Stellaria media agg., Atriplex patula, Chenopodium album, Euphorbia exigua, Euphorbia helioscopia, Trifolium dubium, Trifolium repens, Fumaria bastardii, Fumaria muralis, Geranium dissectum, Lamium purpureum, Stachys arvensis, Kickxia elatine, Plantago lanceolata, Plantago major, Veronica arvensis, Veronica persica, Fallopia convolvulus, Persicaria maculosa, Polygonum aviculare, Polygonum lapathifolium, Rumex crispus, Rumex obtusifolius, Anagallis arvensis, Ranunculus repens, Aphanes microcarpa, Potentilla anserina, Sherardia arvensis, Misopates orontium, Solanum nigrum, Viola arvensis, Agrostis capillaris, Agrostis stolonifera, Elytrigia repens, Holcus lanatus, Lolium perenne, Poa annua, Poa trivialis, Aphanes arvensis
OV13 — Arable, Open habitat arable weed fertile loam and clay
Stellaria media-Capsella bursa-pastoris community
Show 59 indicator speciesArctium minus, Cirsium arvense, Cirsium vulgare, Matricaria discoidea, Senecio vulgaris, Sonchus arvensis, Sonchus asper, Sonchus oleraceus, Tripleurospermum inodorum, Tripleurospermum maritimum, Brassica napus, Capsella bursa-pastoris, Lepidium coronopus, Sinapis arvensis, Sisymbrium officinale, Thlaspi arvense, Spergula arvensis, Stellaria media agg., Atriplex patula, Atriplex prostrata, Chenopodium album, Chenopodium bonus-henricus, Chenopodium rubrum, Chenopodium urbicum, Calystegia sepium, Convolvulus arvensis, Euphorbia helioscopia, Euphorbia peplus, Mercurialis annua, Trifolium repens, Fumaria bastardii, Fumaria muralis, Geranium dissectum, Lamium album, Lamium hybridum, Lamium purpureum, Plantago major, Veronica agrestis, Veronica persica, Veronica polita, Fallopia convolvulus, Persicaria maculosa, Polygonum aviculare, Polygonum lapathifolium, Rumex crispus, Rumex obtusifolius, Galium aparine, Solanum nigrum, Urtica dioica, Urtica urens, Agrostis stolonifera, Alopecurus myosuroides, Anisantha sterilis, Avena fatua, Elytrigia repens, Lolium perenne, Poa annua, Poa pratensis, Chara vulgaris
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