This category includes woodlands of intact ombrotrophic bogs, bog margins and cutover bog. Bog woodland typically occurs on deep acid peat that is relatively welldrained in the upper layers and is commonly associated with former turf cutting activity or drainage. It may also occur in areas of cutover bog where most of the peat has been removed. Downy Birch (Betula pubescens) is the usual dominant and may form pure stands. Other trees and shrubs can include Holly (Ilex aquifolium), Rowan (Sorbus aucuparia), Scots Pine (Pinus sylvestris), oaks (Quercus spp.) and willows (Salix spp.). Dwarf shrubs such as Ling (Calluna vulgaris) or Bilberry (Vaccinium myrtillus) may occur in the field layer, usually in association with Bracken (Pteridium aquilinum), Bramble (Rubus fruticosus agg.), Ivy (Hedera helix), Purple Moor-grass (Molinia caerulea) and Honeysuckle (Lonicera periclymenum).
Woodland of waterlogged acid peat in hollows or depressions in areas of upland woodland on siliceous rocks should also be included in this category. Downy Birch (Betula pubescens) and/or willows (Salix spp.) dominate and the ground flora is characterised by extensive cover of mosses (Sphagnum and Polytrichum spp.), in addition to grasses (Molinia caerulea, Anthoxanthum odoratum), Star Sedge (Carex echinata), Soft Rush (Juncus effusus) and ferns (Dryopteris dilatata, Blechnum spicant).