@inbook {4181, title = {Pertusaria}, booktitle = {Lichens of Great Britain and Ireland}, year = {2009}, pages = {673-687}, publisher = {British Lichen Society}, organization = {British Lichen Society}, address = {London}, author = {Chambers, S.P. and Gilbert, O.L. and James, P.W. and Aptroot, A. and Purvis, O.W.} }