The lichens in the park are doing well on trees trunks, branches, fences and even on the concrete and some of the paths. Lichens often favour just one or two of these habitats.
The high winds (Nov 2010 and later) have allowed me to collect lichens from fallen branches.
Here are some of the lichens we have identified.
An update: Lichens in the Park Nov 2019
This photo (Simon Randolph) taken Nov 2011 show the lichens covering the trunk of an Ash Tree near the depot.
We have several Ash trees Fraxinus excelsior and these species do indeed, at a casual glance seem to have more lichens on them than some other trees, for example our Pines, Pinus nigra which have relatively few lichens.
This British Lichen Society table suggests that the acidity of the bark of the tree determines, to a large extent, the lichen species which will grow.
Bark pH Tree species
Low (acid bark) Oak, Birch, Cherry, Alder, Sweet Chestnut, Rowan, Hawthorn, Hornbeam, Pine
Medium (neutral bark) Hazel, Ash, Sycamore, Willow, Beech
High (basic bark) Elm, Lime, Elder
Roger Deakin's 'Wildwood - A Journey through Trees' is a beautiful piece of nature/travel writing, on a par with Richard Maybey who we think is the British natural history writer who others can only aspire to. Roger has a chapter on Ash trees and at one point he 'lichens do well on ash because its bark is less acidic. They like poplar, sycamore and willow for the same reason, and thrive less well on the acid bark of trees like pine, oak, birch or alder'.
More information and thoughts on this subject here
There is a key to common lichens on British trees here
Add a Comment