{"id":75,"date":"2009-06-03T18:19:46","date_gmt":"2009-06-03T23:19:46","guid":{"rendered":"http:\/\/rdnhs.org.uk\/blog\/?page_id=75"},"modified":"2017-11-25T05:05:25","modified_gmt":"2017-11-25T10:05:25","slug":"lichen-recording","status":"publish","type":"page","link":"https:\/\/rdnhs.org.uk\/blog\/recording\/lichen-recording\/","title":{"rendered":"Lichen recording"},"content":{"rendered":"<p>Dr James Wearn<br \/>\nRoyal Botanic Gardens, Kew<\/p>\n<figure id=\"attachment_366\" aria-describedby=\"caption-attachment-366\" style=\"width: 300px\" class=\"wp-caption alignright\"><a href=\"https:\/\/rdnhs.org.uk\/blog\/wp-content\/uploads\/caloplaca-flavescens-2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-366\" title=\"Caloplaca flavescens\" alt=\"Caloplaca flavescens\" src=\"https:\/\/rdnhs.org.uk\/blog\/wp-content\/uploads\/caloplaca-flavescens-2-300x225.jpg\" width=\"300\" height=\"225\" srcset=\"https:\/\/rdnhs.org.uk\/blog\/wp-content\/uploads\/caloplaca-flavescens-2-300x225.jpg 300w, https:\/\/rdnhs.org.uk\/blog\/wp-content\/uploads\/caloplaca-flavescens-2.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-366\" class=\"wp-caption-text\">A striking Caloplaca flavescens on a headstone<\/figcaption><\/figure>\n<p>This webpage aims to provide a brief introduction to lichens \u2013 intriguing and attractive organisms, which are present all around us.<br \/>\nFirst of all I should start with a brief description of what lichens are, as one may be familiar with the plants and animals of Berkshire and Oxfordshire, but not with this frequently-overlooked group.\u00a0 Lichens are self-supporting associations between two different organisms, a fungus and an alga or cyanobacterium.\u00a0 Each lichen comprises only one fungal species but may have more than one associate so they always bear the name of the fungus. There are around 1,800 species in Britain.<br \/>\nThere are many advantages of looking at lichens.<\/p>\n<ul>\n<li>Lichens can be seen almost anywhere so whether looking at trees, pavements, roof tiles or walls, lichens are usually to be found!\u00a0 Lichens are often the first colonizers in a habitat and show amazing adaptability to harsh environments. Thus, lichenology is not restricted to a particular type of habitat.<\/li>\n<li>Lichens are not only attractive but are almost the same throughout the year, with little variation between the seasons and so can generally be identified as easily in the summer as the winter.<\/li>\n<\/ul>\n<p>There are three main forms of lichen body (thallus). In increasing order of complexity (or \u2018shrubbiness\u2019) they are:<\/p>\n<ol>\n<ol>\n<li><span style=\"text-decoration: underline;\">crustose<\/span> \u2013 forming a thin, firmly attached crust over the surface of the rock or tree [for example, the <em>Caloplaca flavescens<\/em> growing on stone in the photograph at the top of the page]<\/li>\n<\/ol>\n<\/ol>\n<figure id=\"attachment_368\" aria-describedby=\"caption-attachment-368\" style=\"width: 150px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/rdnhs.org.uk\/blog\/wp-content\/uploads\/tombstone-10-aspicilia-calcarea-topped-3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-thumbnail wp-image-368\" title=\"tombstone-10-aspicilia-calcarea-topped-3\" alt=\"tombstone-10-aspicilia-calcarea-topped-3\" src=\"https:\/\/rdnhs.org.uk\/blog\/wp-content\/uploads\/tombstone-10-aspicilia-calcarea-topped-3-150x150.jpg\" width=\"150\" height=\"150\" \/><\/a><figcaption id=\"caption-attachment-368\" class=\"wp-caption-text\">e.g. Aspicilia<\/figcaption><\/figure>\n<ol>\n<ol>\n<li><span><span style=\"text-decoration: underline;\">foliose<\/span><\/span> \u2013 flattened, leaf-like thallus, often attached by small root-like structures called rhizines and can be pulled off with a little effort<\/li>\n<\/ol>\n<\/ol>\n<figure id=\"attachment_369\" aria-describedby=\"caption-attachment-369\" style=\"width: 150px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/rdnhs.org.uk\/blog\/wp-content\/uploads\/xanthoria-pict0076.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-thumbnail wp-image-369\" title=\"Xanthoria\" alt=\"Xanthoria\" src=\"https:\/\/rdnhs.org.uk\/blog\/wp-content\/uploads\/xanthoria-pict0076-150x150.jpg\" width=\"150\" height=\"150\" \/><\/a><figcaption id=\"caption-attachment-369\" class=\"wp-caption-text\">e.g. Xanthoria<\/figcaption><\/figure>\n<ol>\n<ol>\n<li><span style=\"text-decoration: underline;\">fruticose <\/span>\u2013 shrubby, branched, and often attached to its host via a single \u2018stem\u2019<\/li>\n<\/ol>\n<\/ol>\n<figure id=\"attachment_367\" aria-describedby=\"caption-attachment-367\" style=\"width: 150px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/rdnhs.org.uk\/blog\/wp-content\/uploads\/ramalina-pict0091.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-thumbnail wp-image-367\" title=\"Ramalina\" alt=\"Ramalina\" src=\"https:\/\/rdnhs.org.uk\/blog\/wp-content\/uploads\/ramalina-pict0091-150x150.jpg\" width=\"150\" height=\"150\" \/><\/a><figcaption id=\"caption-attachment-367\" class=\"wp-caption-text\">e.g. Ramalina<\/figcaption><\/figure>\n<p>While lichens can be appreciated simply using one\u2019s unaided eyes, a hand lens is very useful in the field in order to see the detail of structures.\u00a0 To safeguard their longevity in our countryside, lichens should only be collected for study or teaching purposes and not where they are rare or where removal from the habitat will cause degradation.<\/p>\n<h3>Where to see lichens near Reading<\/h3>\n<p>I have only recently been appointed Recorder of Lichens for the area and I am discovering there are many good sites for finding interesting species.\u00a0 There are three main habitat types that are worth observing in the local area \u2013 towns, woodlands, and churchyards.\u00a0 Examples include:<\/p>\n<ul>\n<li>Pavements and concrete walls for the common grey-green lichen\u00a0<em>Lecanora muralis<\/em>, a species which has buff to orange disc-like fruiting bodies.\u00a0 It is often mistaken for chewing gum and as such has been informally called the \u2018chewing gum lichen\u2019.<\/li>\n<li>Inkpen Common\u00a0 BBOWT Reserve for Cladonia species on tree bases.<\/li>\n<li>Various churchyards including those at Checkendon, Swallowfield and Wargrave.<\/li>\n<\/ul>\n<h3>Further information<\/h3>\n<ul>\n<li>British Lichen Society [<a href=\"http:\/\/www.britishlichensociety.org.uk\/\" target=\"_top\">http:\/\/www.thebls.org.uk<\/a>]<\/li>\n<li>Dobson, F.S. (2005)\u00a0<em>Lichens. An illustrated guide to the British and Irish species<\/em>.\u00a0 Richmond Publishing<\/li>\n<li>Field Studies Council [<a href=\"http:\/\/www.field-studies-council.org\/\" target=\"_top\">http:\/\/www.field-studies-council.org<\/a>]<\/li>\n<li>Purvis, W. (2007)\u00a0<em>Lichens<\/em>.\u00a0 Natural History Museum, London<\/li>\n<li>Wearn, J.A. (2009)\u00a0<em>Fascinating Lichens<\/em>. Fact sheet [please email me if you would like a copy]<\/li>\n<\/ul>\n<p><img decoding=\"async\" style=\"margin-left: 12px; margin-right: 12px;\" alt=\"Lichens8\" src=\"http:\/\/rdnhs.org.uk\/oldsite\/graphics\/clip_image008.jpg\" align=\"left\" hspace=\"12\" \/><\/p>\n<p align=\"center\"><strong>Showing lichens on an old tree stump to members of the society.<\/strong><br \/>\nBBOWT Reserve at Inkpen, 7 March 2009.<br \/>\n[From left: Roger, Me, Laurie, Dot, Graham, and Ricky]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dr James Wearn Royal Botanic Gardens, Kew This webpage aims to provide a brief introduction to lichens \u2013 intriguing and attractive organisms, which are present&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":73,"menu_order":6,"comment_status":"open","ping_status":"open","template":"","meta":{"_customify_content_layout":"","_customify_sidebar":"","_customify_page_header_display":"","_customify_disable_header":"","_customify_disable_header_top":"","_customify_disable_header_main":"","_customify_disable_header_bottom":"","_customify_disable_page_title":"","_customify_disable_content_vertical_padding":"","_customify_disable_footer_top":"","_customify_disable_footer_main":"","_customify_disable_footer_bottom":"","_customify_breadcrumb_display":"","_customify_header_transparent_display":"","footnotes":""},"class_list":["post-75","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/rdnhs.org.uk\/blog\/wp-json\/wp\/v2\/pages\/75","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rdnhs.org.uk\/blog\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/rdnhs.org.uk\/blog\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/rdnhs.org.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rdnhs.org.uk\/blog\/wp-json\/wp\/v2\/comments?post=75"}],"version-history":[{"count":13,"href":"https:\/\/rdnhs.org.uk\/blog\/wp-json\/wp\/v2\/pages\/75\/revisions"}],"predecessor-version":[{"id":3593,"href":"https:\/\/rdnhs.org.uk\/blog\/wp-json\/wp\/v2\/pages\/75\/revisions\/3593"}],"up":[{"embeddable":true,"href":"https:\/\/rdnhs.org.uk\/blog\/wp-json\/wp\/v2\/pages\/73"}],"wp:attachment":[{"href":"https:\/\/rdnhs.org.uk\/blog\/wp-json\/wp\/v2\/media?parent=75"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}