Tetrad (2km square) Distribution Maps

from the BSBI Maps Scheme



Adiantum capillus-veneris Maidenhair Fern
Adiantum pedatum  
Adiantum raddianum Delta Maidenhair
Anogramma leptophylla Jersey Fern
Asplenium adiantum-nigrum Black Spleenwort
Asplenium fontanum  
Asplenium marinum Sea Spleenwort
Asplenium obovatum Lanceolate Spleenwort
Asplenium onopteris Western Black Spleenwort
Asplenium ruta-muraria Wall-rue
Asplenium septentrionale Forked Spleenwort
Asplenium trichomanes Maidenhair Spleenwort
Asplenium trichomanes subsp. pachyrachis Lobed Maidenhair Spleenwort
Asplenium trichomanes subsp. quadrivalens Common Maidenhair Spleenwort
Asplenium trichomanes subsp. trichomanes Delicate Maidenhair Spleenwort
Asplenium viride Green Spleenwort
Asplenium x alternifolium A. trichomanes x septentrionale (Alternate-leaved Spleenwort)
Asplenium x clermontiae A. trichomanes x ruta-muraria
Asplenium x contrei A. adiantum-nigrum x septentrionale
Asplenium x lusaticum A. trichomanes ssp. quadrivalens x trichomanes ssp. trichomanes
Asplenium x murbeckii A. septentrionale x ruta-muraria (Murbeck's Spleenwort)
Asplenium x sarniense A. adiantum-nigrum x obovatum
Asplenium x staufferi A. trichomanes ssp. quadrivalens x trichomanes ssp. pachyrachis
Asplenium x ticinense A. adiantum-nigrum x onopteris
Athyrium distentifolium Alpine Lady-fern
Athyrium filix-femina Lady Fern
Athyrium flexile Newman's Lady-fern
Azolla filiculoides American Water Fern
Blechnum cordatum Chilean Hard-fern
Blechnum penna-marina Alpine Hard Fern
Blechnum spicant Hard Fern
Botrychium lunaria Moonwort
Ceterach officinarum Rustyback Fern
Cryptogramma crispa Parsley Fern
Cyrtomium falcatum House Holly-fern
Cyrtomium fortunei Matt Holly-fern
Cyrtomium macrophyllum Big-leaf Holly-fern
Cystopteris diaphana Diaphanous Bladder-fern
Cystopteris dickieana Dickie's Bladder-fern
Cystopteris fragilis Brittle Bladder-fern
Cystopteris montana Mountain Bladder-fern
Dryopteris aemula Hay-scented Buckler-fern
Dryopteris affinis Scaly Male Fern
Dryopteris affinis subsp. affinis Golden Scaly Male-fern
Dryopteris affinis subsp. borreri Borrer's Scaly Male-fern
Dryopteris affinis subsp. cambrensis Narrow Scaly Male-fern
Dryopteris carthusiana Narrow Buckler-Fern
Dryopteris cristata Crested or Fen Buckler-fern
Dryopteris dilatata Broad Buckler-fern
Dryopteris expansa Northern Buckler-fern
Dryopteris filix-mas Common Male Fern
Dryopteris oreades Mountain Male-fern
Dryopteris remota Scaly Buckler-fern
Dryopteris submontana Rigid Buckler-fern
Dryopteris x ambroseae D. dilatata x expansa
Dryopteris x brathaica D. carthusiana x filix-mas
Dryopteris x complexa D. affinis x filix-mas
Dryopteris x deweveri D. carthusiana x dilatata
Dryopteris x mantoniae D. filix-mas x oreades
Dryopteris x pseudoabbreviata D. aemula x oreades
Dryopteris x sarvelae D. carthusiana x expansa
Dryopteris x uliginosa D. carthusiana x cristata
Equisetum arvense Field Horsetail
Equisetum fluviatile Water Horsetail
Equisetum hyemale Rough Horsetail or Dutch Rush
Equisetum palustre Marsh Horsetail
Equisetum pratense Shade Horsetail
Equisetum ramosissimum Branched Horsetail
Equisetum sylvaticum Wood Horsetail
Equisetum telmateia Great Horsetail
Equisetum variegatum Variegated Horsetail
Equisetum x bowmanii E. sylvaticum x telmateia
Equisetum x dycei E. fluviatile x palustre
Equisetum x font-queri E. palustre x telmateia
Equisetum x litorale E. arvense x fluviatile (Shore Horsetail)
Equisetum x mchaffieae Equisetum fluviatile x pratense
Equisetum x mildeanum E. pratense x sylvaticum
Equisetum x moorei E. hyemale x ramosissimum (Moore's Horsetail)
Equisetum x robertsii E. arvense x telmateia (Anglesey Horsetail)
Equisetum x rothmaleri E. arvense x palustre
Equisetum x trachyodon E. hyemale x variegatum (Mackay's Horsetail)
Equisetum x willmotii E. fluviatile x telmateia
Gymnocarpium dryopteris Oak Fern
Gymnocarpium robertianum Limestone Oak Fern
Huperzia selago Fir Clubmoss
Hymenophyllum tunbrigense Tunbridge Filmy-fern
Hymenophyllum wilsonii Wilson's Filmy-fern
Isoetes echinospora Spring Quillwort
Isoetes histrix Land Quillwort
Isoetes lacustris Common Quillwort
Isoetes x hickeyi I. lacustris x echinospora
Lycopodiella inundata Marsh Clubmoss
Lycopodium annotinum Interrupted Clubmoss
Lycopodium clavatum Stag's-horn Clubmoss
Lycopodium lagopus Arctic Stag's-horn Clubmoss
Matteuccia struthiopteris Ostrich Fern
Ophioglossum azoricum Small Adder's-tongue
Ophioglossum lusitanicum Least Adder's-tongue
Ophioglossum vulgatum Common Adder's-tongue
Oreopteris limbosperma Mountain or Lemon-scented Fern
Osmunda regalis Royal Fern
Phegopteris connectilis Beech Fern
Phyllitis scolopendrium Hart's-tongue
Pilularia globulifera Pillwort
Polypodium cambricum Southern Polypody
Polypodium interjectum Western Polypody
Polypodium vulgare Common Polypody
Polypodium vulgare sens. lat. Polypody
Polypodium x font-queri P. vulgare x cambricum (Font-Quer's Polypody)
Polypodium x mantoniae P. vulgare x interjectum
Polypodium x shivasiae P. interjectum x cambricum (Shivas's Polypody)
Polystichum aculeatum Hard Shield-fern
Polystichum lonchitis Holly-fern
Polystichum munitum Western Sword-fern
Polystichum setiferum Soft Shield-fern
Polystichum x bicknellii P. setiferum x aculeatum
Polystichum x illyricum P. aculeatum x lonchitis
Polystichum x lesliei Polystichum setiferum x munitum
Polystichum x lonchitiforme P. lonchitis x setiferum
Pteridium aquilinum Bracken
Pteris cretica Ribbon Fern
Pteris multifida Spider Brake
Pteris tremula Tender Brake
Pteris vittata Rusty Brake
Selaginella kraussiana Krauss's Clubmoss
Selaginella selaginoides Lesser Clubmoss
Thelypteris palustris Marsh Fern
Trichomanes speciosum Killarney Fern
Trichomanes venosum  
Woodsia alpina Alpine Woodsia
Woodsia ilvensis Oblong Woodsia
Woodwardia radicans Chain Fern
X Asplenophyllitis confluens Phyllitis scolopendrium x Asplenium trichomanes
X Asplenophyllitis jacksonii Asplenium adiantum-nigrum x Phyllitis scolopendrium
X Asplenophyllitis microdon Asplenium obovatum x Phyllitis scolopendrium



BSBI Maps Scheme
The BSBI Maps Scheme produces 10km square, or hectad, dot maps showing the distribution of vascular plants and charophytes in the British Isles, updated at weekly intervals. It was launched in 1950 and is now based on a ten-year cycle of recording, so the black dots at any point in time show only the records that have come in so far this decade.

The BSBI Maps Scheme database was commissioned by David Pearman, designed by Alex Lockton and constructed by Alan Hale and Bob Ellis. Quentin Groom & Alex Lockton manage the data and maintain the maps. The project is funded by the BSBI.



The Tetrad Maps Scheme

The next step will be to change the resolution of the dots from 10km to 2km - a 25 fold increase in recording. Many counties have done this already, but coverage is far from complete. For the rarer species the tetrad maps are quite comprehensive, but for commoner plants they simply show the counties that record at tetrad scale.

If you would like to see how the Tetrad Maps Scheme is developing, have a look at the maps, but be aware of the limitations of the data so far.




Copyright ©1997-2010 British Pteridological Society

This page was last updated on 30/8/10