Allolee to Walltown

Site of Special Scientific Interest · 54.9943, -2.4912

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Also within

Northumberland County NORTHUMBERLAND National Park Hadrian's Wall Path National TrailPennine Way National Trail

Condition (Natural England)

Favourable (1) Unfavourable Recovering (1)
UnitFeatureConditionArea (ha)Assessed
NY682666 — Favourable 16.28 2010-08-03
NY690668 — Unfavourable Recovering 18.06 2010-08-03

Habitats

Purple moor grass and rush pasture

Geology & landscape

Geological Feature: Igneous Intrusion · Rock Type: Basalt, Limestone

Landscape processes: Volcanic / Igneous

Description

Area,1,10 00033.9 hectares 83.7 ac Description The site referred to as ‘Allolee to Walltown’ comprises a section of the prominent whin Sill escarpment along the rest of which runs Hadrian’s Wall. It is of interest for its unusually wide range of grassland types, together with uncommon plants associated with thin soils overlying the whin Sill. The whin Sill, which is restricted to Northumberland and Durham is composed of a basalt quartz dolerite which is less acidic than others of this type. When slabs of the whin Sill are exposed on the dip slopes, the crevices are colonised by plants which can tolerate the dry conditions which affect the thin, peaty soils in summer. The most notable of these is wild chives Allium schoenoprasum, a rare plant which in Northumberland is restricted to a few sites on the whin Sill. Other species associated with the thin soils include biting stonecrop Sedum acre, the uncommon hairy stonecrop S. villosum, wild thyme Thymus praecox and a variety of annuals including parsley piert Aphanes arvensis, common whitlow grass Erophila verna, early hair grass Aira praecox, annual knawel Scleranthus annuus, rue leaved saxifrage Saxifraga tridactylites and long stalked cranesbill Geranium columbinum. Most of the surrounding grassland is composed of red fescue Festuca rubra, common bent Agrostis capillaris, sweet vernal grass Anthoxanthum odoratum, crested dog’s tail Cynosurus cristatus and heath grass Danthonia decumbens. On the crags and north facing scarp slopes bilberry Vaccinium myrtillus and heather Calluna vulgaris occur, with fir clubmoss Huperzia selago and parsley fern Cryptogramma crispa. Scattered limestone outcrops occur on which grows green spleenwort Asplenium viride. The more calcareous areas support a herb rich grassland with meadow oat grass Avenula pratensis, quaking grass Briza media, dyer’s greenweed Genista tinctoria, common rock rose Helianthemum nummularium, greater burnet Sanguisorba officinalis and salad burnet S. minor. On the dip slope east of Allolee, where the drainage is impeded, there occurs a most unusual species rich grassland dominated by purple moor grass Molinia caerulea associated with which are quaking grass, meadow oat grass, spring sedge Carex caryophyllea, glaucous sedge Carex flacca, tawny sedge Carex hostiana, flea sedge C. pulicaris, lady’s mantle Alchemilla filicaulis, lady’s bedstraw Galium verum, fairy flax Linum catharticum, cowslip Primula veris, devil’s bit scabious Succisa pratensis, greater burnet and wild thyme.

Species mentioned

English name
search for this in other sites		 Latin name
search with Google		 IUCN / Red List Type Family
green spleenwort Asplenium viride LC fern aspleniaceae
parsley fern Cryptogramma crispa VU fern adiantaceae
common bent Agrostis capillaris LC grass poaceae
early hair grass Aira praecox VU grass poaceae
sweet vernal grass Anthoxanthum odoratum LC grass poaceae
parsley piert Aphanes arvensis LC grass rosaceae
meadow oat grass Avenula pratensis Not listed in GB list grass poaceae
quaking grass Briza media VU grass poaceae
crested dog's tail Cynosurus cristatus LC grass poaceae
heath grass Danthonia decumbens NT grass poaceae
red fescue Festuca rubra LC grass poaceae
purple moor grass Molinia caerulea LC grass poaceae
lady's mantle Alchemilla filicaulis VU herb rosaceae
wild chives Allium schoenoprasum LC herb liliaceae
Whitlow grasses Erophila verna LC herb brassicaceae
lady's bedstraw Galium verum LC herb rubiaceae
dyer's greenweed Genista tinctoria LC herb fabaceae
long stalked cranesbill Geranium columbinum VU herb geraniaceae
rock roses Helianthemum nummularium VU herb cistaceae
fairy flax Linum catharticum LC herb linaceae
cowslip Primula veris LC herb primulaceae
great burnet Sanguisorba officinalis LC herb rosaceae
rue leaved saxifrage Saxifraga tridactylites LC herb saxifragaceae
annual knawel Scleranthus annuus DD herb carophyllaceae
wall-pepper Sedum acre LC herb crassulaceae
devils-bit scabious Succisa pratensis VU herb caprifoliaceae
creeping thyme Thymus praecox Not listed in GB list herb lamiaceae
fir clubmoss Huperzia selago LC moss club lycopodiaceae
spring-sedge Carex caryophyllea NT sedge cyperaceae
glaucus sedge Carex flacca LC sedge cyperaceae
tawny sedge Carex hostiana LC sedge cyperaceae
billberry Vaccinium myrtillus LC shrub ericaceae
bell heather or ling Calluna vulgaris NT shrub dwarf ericaceae

Plant communities

M22 — Coastal floodplain grazing marsh, Lowland fen, Purple moor grass and rush pasture

Juncus subnodulosus-Cirsium palustre fen-meadow

Salix cinerea, Solanum dulcamara, Carex acutiformis, Carex disticha, Carex elata, Carex flacca, Carex hirta, Carex lepidocarpa, Carex nigra, Carex panicea, Carex rostrata, Cladium mariscus, Eriophorum angustifolium, Eleocharis palustris, Eleocharis uniglumis, Juncus articulatus, Juncus effusus, Juncus inflexus, Juncus subnodulosus, Luzula multiflora, Plagiomnium affine, Plagiomnium rostratum, Plagiomnium undulatum, Rhizomnium punctatum, Brachythecium rutabulum, Calliergonell cuspidatum, Cratoneuron filicinum, Pseudoscleropodium purum, Lophocolea bidentata, Angelica sylvestris, Berula erecta, Oenanthe lachenalii, Thyselium palustre, Hydrocotyle vulgaris, Achillea ptarmica, Caltha palustris, Centaurea nigra, Cirsium arvense, Cirsium dissectum, Cirsium palustre, Eupatorium cannabinum, Pulicaria dysenterica, Myosotis laxa, Myosotis scorpioides, Cardamine pratensis, Succisa pratensis, Valeriana dioica, Valeriana officinalis, Cerastium fontanum, Silene flos-cuculi, Stellaria palustris, Calystegia sepium, Equisetum fluviatile, Equisetum palustre, Lathyrus pratensis, Lotus pedunculatus, Trifolium pratense, Trifolium repens, Vicia cracca, Hypericum tetrapterum, Iris pseudacorus, Triglochin palustre, Ajuga reptans, Lycopus europaeus, Mentha aquatica, Lemna minor, Lythrum salicaria, Menyanthes trifoliata, Epilobium hirsutum, Epilobium palustre, Epilobium parviflorum, Dactylorhiza fuchsii, Dactylorhiza incarnata, Dactylorhiza praetermissa, Epipactis palustris, Pedicularis palustris, Rhinanthus minor, Plantago lanceolata, Veronica beccabunga, Polygonum amphibium, Rumex acetosa, Rumex conglomeratus, Rumex sanguineus, Lysimachia vulgaris, Primula vulgaris, Ranunculus acris, Ranunculus flammula, Ranunculus repens, Thalictrum flavum, Comarum palustre, Filipendula ulmaria, Potentilla anserina, Potentilla erecta, Potentilla reptans, Galium palustre, Galium uliginosum, Scrophularia auriculata, Scutellaria galericulata, Agrostis stolonifera, Anthoxanthum odoratum, Arrhenatherum elatius, Briza media, Calamagrostis canescens, Cynosurus cristatus, Deschampsia cespitosa, Festuca rubra, Holcus lanatus, Molinia caerulea, Phalaris arundinacea, Phleum pratense, Phragmites australis, Poa trivialis, Schedonorus arundinaceus, Ophioglossum vulgatum, Thelypteris palustris

M23 — Coastal floodplain grazing marsh, Purple moor grass and rush pasture, Upland rush pasture

Juncus effusus/acutiflorus-Galium palustre rush-pasture

Carex demissa, Carex echinata, Carex nigra, Carex panicea, Juncus acutiflorus, Juncus articulatus, Juncus bulbosus, Juncus conglomeratus, Juncus effusus, Luzula campestris, Luzula multiflora, Aulacomnium palustre, Brachythecium rivulare, Brachythecium rutabulum, Calliergon cordifolium, Calliergonell cuspidatum, Kindbergia praelonga, Rhytidiadelphus squarrosus, Polytrichum commune, Calypogeia fissa, Lophocolea bidentata, Pellia epiphylla, Angelica sylvestris, Carum verticillatum, Hydrocotyle vulgaris, Achillea ptarmica, Caltha palustris, Cirsium palustre, Senecio aquaticus, Taraxacum officianalis, Myosotis laxa, Myosotis secunda, Cardamine flexuosa, Cardamine pratensis, Succisa pratensis, Valeriana officinalis, Cerastium fontanum, Silene flos-cuculi, Stellaria alsine, Stellaria graminea, Equisetum fluviatile, Equisetum palustre, Lathyrus pratensis, Lotus pedunculatus, Trifolium repens, Iris pseudacorus, Mentha aquatica, Scutellaria minor, Lythrum salicaria, Narthecium ossifragum, Epilobium obscurum, Epilobium palustre, Dactylorhiza maculata, Plantago lanceolata, Veronica scutellata, Polygonum hydropiper, Rumex acetosa, Primula vulgaris, Ranunculus acris, Ranunculus flammula, Ranunculus repens, Comarum palustre, Filipendula ulmaria, Potentilla anserina, Potentilla erecta, Galium palustre, Viola palustris, Agrostis canina, Agrostis capillaris, Agrostis stolonifera, Anthoxanthum odoratum, Cynosurus cristatus, Deschampsia cespitosa, Festuca rubra, Glyceria fluitans, Holcus lanatus, Molinia caerulea, Poa pratensis, Poa trivialis, Dryopteris expansa, Athyrium filix-femina

M24 — Coastal floodplain grazing marsh, Lowland fen, Purple moor grass and rush pasture

Molinia caerulea-Cirsium dissectum fen-meadow

Salix cinerea, Salix repens, Alnus glutinosa, Calluna vulgaris, Erica tetralix, Carex hostiana, Carex nigra, Carex panicea, Carex pulicaris, Cladium mariscus, Eriophorum angustifolium, Schoenus nigricans, Juncus acutiflorus, Juncus articulatus, Juncus conglomeratus, Juncus effusus, Juncus subnodulosus, Luzula multiflora, Aulacomnium palustre, Brachythecium rutabulum, Calliergonell cuspidatum, Hypnum cupressiforme, Kindbergia praelonga, Pseudoscleropodium purum, Thuidium tamariscinum, Sphagnum auriculatum, Sphagnum subnitens, Angelica sylvestris, Hydrocotyle vulgaris, Achillea ptarmica, Centaurea nigra, Cirsium arvense, Cirsium dissectum, Cirsium palustre, Eupatorium cannabinum, Leontodon saxatilis, Pulicaria dysenterica, Senecio aquaticus, Serratula tinctoria, Cardamine pratensis, Succisa pratensis, Valeriana dioica, Cerastium fontanum, Silene flos-cuculi, Drosera rotundifolia, Equisetum palustre, Lathyrus pratensis, Lotus pedunculatus, Trifolium pratense, Vicia cracca, Hypericum tetrapterum, Hypericum undulatum, Mentha aquatica, Scutellaria minor, Linum catharticum, Lythrum salicaria, Narthecium ossifragum, Dactylorhiza fuchsii, Dactylorhiza incarnata, Dactylorhiza maculata, Epipactis palustris, Gymnadenia conopsea, Pedicularis sylvatica, Plantago lanceolata, Polygala vulgaris, Rumex acetosa, Anagallis tenella, Primula vulgaris, Ranunculus acris, Ranunculus flammula, Filipendula ulmaria, Potentilla anserina, Potentilla erecta, Potentilla reptans, Rubus fruticosus agg., Galium palustre, Galium uliginosum, Galium verum, Viola palustris, Agrostis canina, Agrostis stolonifera, Anthoxanthum odoratum, Briza media, Danthonia decumbens, Deschampsia cespitosa, Festuca rubra, Holcus lanatus, Molinia caerulea, Phragmites australis

M25 — Blanket bog, Coastal floodplain grazing marsh, Lowland fen, Purple moor grass and rush pasture, Upland acid grassland

Molinia caerulea-Potentilla erecta mire

Salix cinerea, Calluna vulgaris, Erica tetralix, Myrica gale, Vaccinium oxycoccos, Ulex europaeus, Ulex gallii, Carex echinata, Carex flacca, Carex nigra, Carex panicea, Eriophorum angustifolium, Schoenus nigricans, Juncus acutiflorus, Juncus articulatus, Juncus effusus, Juncus subnodulosus, Luzula campestris, Luzula multiflora, Aulacomnium palustre, Pohlia nutans, Calliergon giganteum, Calliergonell cuspidatum, Hypnum jutlandicum, Kindbergia praelonga, Pleurozium schreberi, Pseudoscleropodium purum, Rhytidiadelphus squarrosus, Polytrichum commune, Sphagnum auriculatum, Sphagnum capillifolium, Sphagnum fallax, Sphagnum palustre, Sphagnum papillosum, Sphagnum subnitens, Calypogeia fissa, Cephalozia bicuspidata, Lophocolea bidentata, Lophozia ventricosa, Angelica sylvestris, Carum verticillatum, Hydrocotyle vulgaris, Achillea ptarmica, Centaurea nigra, Cirsium palustre, Eupatorium cannabinum, Pulicaria dysenterica, Serratula tinctoria, Cardamine pratensis, Lobelia urens, Succisa pratensis, Valeriana officinalis, Equisetum palustre, Lotus pedunculatus, Hypericum pulchrum, Hypericum tetrapterum, Mentha aquatica, Scutellaria minor, Menyanthes trifoliata, Narthecium ossifragum, Epilobium palustre, Dactylorhiza maculata, Rumex acetosa, Ranunculus acris, Ranunculus flammula, Filipendula ulmaria, Potentilla erecta, Rubus fruticosus agg., Galium palustre, Viola palustris, Agrostis canina, Agrostis capillaris, Agrostis curtisii, Agrostis stolonifera, Anthoxanthum odoratum, Danthonia decumbens, Deschampsia cespitosa, Festuca ovina, Festuca rubra, Holcus lanatus, Molinia caerulea, Nardus stricta, Phragmites australis, Dryopteris carthusiana, Osmunda regalis

M26 — Limestone pavement, Purple moor grass and rush pasture

Molinia caerulea-Crepis paludosa mire

Carex appropinquata, Carex disticha, Carex echinata, Carex flacca, Carex hostiana, Carex nigra, Carex panicea, Carex pulicaris, Juncus acutiflorus, Juncus articulatus, Juncus conglomeratus, Aulacomnium palustre, Plagiomnium undulatum, Calliergonell cuspidatum, Campylium elodes, Climacium dendroides, Ctenidium molluscum, Hylocomium splendens, Pseudoscleropodium purum, Rhytidiadelphus squarrosus, Thuidium tamariscinum, Lophocolea bidentata, Plagiochila asplenioides, Angelica sylvestris, Caltha palustris, Centaurea nigra, Cirsium palustre, Crepis paludosa, Leontodon hispidus, Serratula tinctoria, Succisa pratensis, Valeriana dioica, Silene flos-cuculi, Equisetum fluviatile, Equisetum palustre, Lathyrus pratensis, Trifolium repens, Menyanthes trifoliata, Rhinanthus minor, Plantago lanceolata, Rumex acetosa, Primula farinosa, Primula vulgaris, Anemone nemorosa, Ranunculus acris, Ranunculus auricomus, Trollius europaeus, Comarum palustre, Filipendula ulmaria, Geum rivale, Potentilla erecta, Sanguisorba officinalis, Galium palustre, Galium uliginosum, Agrostis stolonifera, Anthoxanthum odoratum, Briza media, Deschampsia cespitosa, Festuca ovina, Festuca rubra, Holcus lanatus, Molinia caerulea, Phragmites australis