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Plantlife Lichens & Bryophytes of Atlantic Lichens Bryophytes and Atlantic of Woodland in the Lake District, England A handbook for woodland managers Contents 3 ..... Scope 4 ..... Britain’s Atlantic woodland: Our Celtic Rainforest 5 ..... Atlantic woodland in the Lake District 5 ..... Important Plant Areas in the Lake District Scope 6 ..... Lichen and bryophyte interest in the Atlantic woodlands of the Lake District 6 ...... Lichens The Atlantic woodlands of the Lake District are part of the Celtic 7 ...... Important lichen communities and their ecological requirements: Rainforest of western Britain and are internationally important for 7 ...... Base-rich bark community (the Lobarion – ‘lungs of the forest’) 7 ...... Acid-bark community (the Parmelion – grey lobes and whitish crusts) their rich lichen and bryophyte communities. 7 ...... Smooth bark community (the Graphidion – ‘dots and squiggles’) 7 ...... Mesic bark community (the Pertusarietum - specialist crustose species) Due to their global conservation significance, many sites are 7 ...... Veteran tree community (specialist crustose species) recognised as Important Plant Areas (IPAs) and designated as Sites 8 ...... Bryophytes of Special Scientific Interest (SSSIs) or Special Areas of Conservation 9 ...... Important bryophyte communities and their ecological requirements: 9 ...... Deadwood community (SACs), supporting a number of red listed and Section 41 species. 9 ...... Rocky watercourse community 9 ...... Woodland floor community Despite their international importance, our Atlantic woodlands face a 10 ... Ideal conditions for lichens and bryophytes number of threats ranging from site-specific issues such as increasing 10 ... At the woodland level shade and a loss of grazing, to wider problems such as a changing 10 ... At the substrate level climate, atmospheric pollution and tree disease. To ensure a secure 11 ... Frequently asked questions 12 ... Planning management of Atlantic woodlands for lichens and bryophytes future for this habitat, favourable long-term management is essential. 12 ... Rapid Woodland Assessment 12 ... Key steps in planning management 14 ... Making sites better: site management – Issues at the site level Written for woodland owners 14 ... Grazing and browsing 14 ... Issue 1: Managing grazing and browsing and managers, this publication 17 ... Diverse woodland structure & composition 17 ... Issue 2: Lack of tree age diversity will help in understanding 18 ... Issue 3: Lack of structural diversity 19 ... Issue 4: Excessive regeneration that cannot be addressed with grazing the key conservation issues 20 ... Issue 5: Lack of tree species diversity affecting woodland lichens and 20 ... Current and future veteran trees 20 ... Issue 6: Declining conditions of existing veteran trees bryophytes, while providing 21 ... Issue 7: Lack of recruitment of future ancient trees 23 ... Retention of deadwood a framework and guidance to 23 ... Issue 8: Lack of standing and lying deadwood 24 ... Management of native/non-native species manage Atlantic woodlands 24 ... Issue 9: Invasive species; both native and non-native 27 ... Issue 10: Restoring conifer plantation to native woodland in the Lake District for lichens 28 ... Making sites bigger & better connected: site management – Issues at the landscape level and bryophytes. 28 ... Resilient woodlands 28 ... Issue 11: Habitat fragmentation 29 ... Issue 12: Tree diseases and pests 31 ... Issue 13: Climate change 33 ... Issue 14: Air pollution 36 ... Issue 15: Small-scale Hydroelectric Power (HEP) Schemes Atlantic birchwood with oceanic lichen and © April Windle 37 ... References bryophyte communities. Stanley Ghyll, Eskdale The development of this guide has been written by April Windle (LOST Project Officer) and Dave Lamacraft (Lower Plant Champion), and has been adapted from the Lichens and Bryophytes of Atlantic Woodland in South West England: A handbook for woodland managers. With full acknowledgement to all Plantlife staff involved, Front cover: A rich Atlantic woodland habitat of Seatoller contributions from Des Callaghan and Neil Sanderson, alongside others involved in the production of the South (Borrowdale), with rocky streams supporting populations of West guide. oceanic bryophyte Radula voluta. This species is known from three sites in England, all found within the Borrowdale Woodland Many thanks also goes to Allan Pentecost, Andy McLay, Diane Dobson, Ivan Day, Leila Todhunter, Complex. The population found within Seatoller Wood is Maurice Pankhurst, Richard Tanner and Simon Webb for sharing local species and habitat knowledge. considered the largest in the UK (A. McLay, pers comm). This guide has been produced as part of the Looking Out for Small Things (LOST) project and funded by the National Lottery Heritage Fund. Please cite as: Plantlife (2020) Lichens and Bryophytes of Atlantic Woodlands in the Lake District, England. Plantlife, Salisbury. 2 Lichens and Bryophytes of Atlantic Woodland in the Lake District, England A handbook for woodland managers 3 Atlantic woodlands in the Lake District In the Lake District, Atlantic woodlands are generally ‘oceanic’1 in character, but some areas have either ‘hyper-oceanic’2 (e.g. © April Windle Seathwaite, Borrowdale) or ‘sub-oceanic’3 elements (e.g. Rydal, Ambleside) and these harbour globally rare and threatened species of lichens and bryophytes. As well as ‘typical’ Atlantic woodland, the Lake District is also home to important ancient wood pasture and parkland habitat, where the significant lichen interest is associated with veteran trees. Veteran wych elm at Gowbarrow Park, Ullswater (above) Global distribution of the temperate rainforest biome © April Windle Britain’s Atlantic woodland: Our Celtic Rainforest Atlantic woodlands are part of the temperate rainforest biome, a type of habitat with a globally restricted distribution. Atlantic woodlands are characterised by: Borrowdale Atlantic woodland, Ashness Woods Rainfall; high annual average with little variation through the year and total number of wet days Temperature; little annual temperature variation Important Plant Areas in the Lake District Important Plant Areas (IPAs) are the most important places for wild plants and fungi in the world. Identifying and managing IPAs is a fundamental part of the Global Strategy for Plant Conservation, of which the UK is a signatory. For more information on Important Plant Areas (IPAs) in the Lake District and across the UK, see www.plantlifeipa.org 1 Relatively little difference in rainfall and temperature through the year (relatively equable climate). 2 Very little difference in rainfall and temperature through the year (very equable climate). 3 Slightly drier and sunnier than in more typically oceanic areas. 4 Lichens and Bryophytes of Atlantic Woodland in the Lake District, England A handbook for woodland managers 5 Acid-bark community (the Parmelion – Lichen and bryophyte interest in the grey lobes and whitish crusts) This includes the large leafy ‘loop lichens’ © April Windle Atlantic woodlands of the Lake District (Hypotrachyna species) and grey ‘cudbear lichens’ (Ochrolechia species). See Plantlife’s ‘Lichens of Atlantic Woodlands in the Lake District – Guide 2, Parmelion’. Lichens This community requires well-lit, acidic substrates, © April Windle such as birch, alder and young oak trees, alongside Different species of lichen can have acidic rocks. preferences for similar environmental conditions, forming distinct communities. Parmelion community on stunted oak Key factors in determining which lichens grow where, and hence where communities Smooth bark community of lichens are found, is the chemistry and (the Graphidion – ‘dots and squiggles’) texture of the substrate ie. tree, rock, soil. Although often dominated by common species, © April Windle such as the script lichen Graphis scripta, in the Lake District this includes globally rare species such as the ‘blackberries in custard’ Pyrenula hibernica. Oak with base-rich bark This community requires smooth, young bark, supporting the Lobarion typically of undisturbed (i.e. un-coppiced) community. Rydal Park, hazel stands. Lake District Smooth bark Graphidion community on hazel Table 1: Typical bark chemistry for common tree species Table 1 shows typical Mesic bark community (the bark chemistry for Bark chemistry Species Pertusarietum – specialist crustose common tree species. species) © April Windle Low pH (acid bark) Alder, beech*, birch, hawthorn, hornbeam, It is worth noting that A largely southern community in the UK, but with oak*, pine, rowan, spruce, sweet chestnut substrate chemistry can a very important stronghold in the Lake District, be influenced by factors Medium pH (less acidic/ Ash, beech*, hazel, lime, oak*, where this community includes the largest fertile such as atmospheric more base-rich) sycamore, willow population of the rare geranium firedot lichen pollution, and that bark Caloplaca herbidella in England. chemistry of some High pH (base-rich bark) Elm, field maple species changes over time This community requires well-lit mature trees with less acidic bark e.g. in parkland. (e.g. oak, which becomes *Old beech and oak become less acidic and more base-rich with age and can less acidic with age). support Lobarion species. Pertusarietum community with S41 Caloplaca herbidella Veteran tree communities (specialist crustose species) Important lichen communities and their ecological Communities found on veteran trees, with features © April Windle such as craggy bark, exposed lignum, wound tracks requirements: and dry bark. This
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