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	Lichens of North America - http://www.lichen.com/ Details of the book of this name, and an interesting introduction to the biology of lichens and their relationships with man and the environment.
	http://www.lias.net/ - http://www.lias.net/ Provides a global information system for lichenized and non-lichenized ascomycetes.
	Lichenland - http://ocid.nacse.org/lichenland/ Offers ways to find out more about lichens including Lichenlite, an introduction for children. For more advanced study there is a synoptic key and an identification aid.
	Introduction to Lichens - http://www.ucmp.berkeley.edu/fungi/lichens/lichens.html A lichen is a combination of two organisms which live together intimately. Information on their fossil record, life history and ecology, systematics and morphology.
	Lichen Portrait Gallery - http://www.lichen.com/portraits.html Photographs of over eighty species of lichen from North America.

	Letharia vulpina - http://www.lichen.com/bigpix/Lvulpina.html Photograph of Wolf Lichen which in the past was put to many uses by the indigenous peoples in North America.
	Catalog of California Lichens - http://ucjeps.berkeley.edu/constancea/84/index.html 1575 species have been identified from this state, the great geographic diversity being responsible for the relatively large number of lichens found.
	Lichen Pictures - http://www.botany.hawaii.edu/cpsu/pictures/0.html Photographs of Acolium hawaiiense, Acroscyphus sphaerophoroides, Anaptychia leucomelos, Bacidia medialis, Bryoria furcellata, B. smithii, Buellia aeruginascens, B. proximata, B. pruinosa, B. tincta, Caloplaca erythrantha and Teloschistes flavicans.
	Walton Hall Nature Trail - http://www.open.ac.uk/Nature_Trail/Lichen.htm Take a walk through the churchyard to see what lichens grow on the different man-made outcrops of stone.
	Lichens: Dual Organisms - http://www.mycolog.com/chapter7.htm Twenty four photographs ranging from lichen covered rock faces, through individual species to magnified sections, published in a pictorial supplement to the Fifth Kingdom.

	Lichens as Bioindicators of Air Pollution - http://www.colostate.edu/Depts/Entomology/courses/en570/papers_1996/simonson.html Technical article discussing how lichens play prominent roles in air pollution studies because of their sensitivity to different gaseous pollutants, particularly sulfur dioxide.
	Checklist of UK Recorded Lichens - http://www.thebls.org.uk/content/checklist.html Provides a list of all the species known to be found in the United Kingdom.
	FIA Lichen Indicator - http://www.fia.fs.fed.us/program-features/indicators/lichen/ The Forest Inventory and Analysis service in the United States monitors the lichen community in order to assess the impact of air pollution on forest health.
	Cladonia rangifera - http://botit.botany.wisc.edu/toms_fungi/dec2000.html Article by Tom Volk on this lichen, often known as Reindeer Moss, and on lichens in general.
	Cladonia cristatella - http://botit.botany.wisc.edu/toms_fungi/jul2002.html Article by Tom Volk on the British soldier lichen, where the fungal element is associated with the green alga, Trebouxia erici.

	Cetraria islandica - http://www.lichen.com/bigpix/Cislandica.html Photograph and information on this lichen which has been used as a food in time of famine.
	Identifying North American Lichens: A Guide to the Literature - http://www.huh.harvard.edu/collections/lichens/guide/index.html Provides general lichen references including works for beginners, lichen keys online, and a lichen bibliography by genus.
	Lichen Determination Keys Available on the Internet - http://www.bgbm.fu-berlin.de/sipman/keys/ Provides links to keys providing details of the lichens that can be found in many countries throughout the world.
	http://www.backyardnature.net/lichens.htm - http://www.backyardnature.net/lichens.htm An illustrated introduction to the lichens with information on their ecology and reproduction.
	Sac Fungi (Ascomycota) - http://www.marlin.ac.uk/phylumdetails.php?phylum=2857 Photographs and information on a number of species of lichen associated with a marine habitat.

	Cryptothecia rubrocincta, the Christmas Lichen - http://botit.botany.wisc.edu/toms_fungi/dec2006.html Photographs and article by Tom Volk on this spectacular lichen which can be found in the tropical regions of the Americas.
	Caloplaca coralloides - http://www.mbari.org/staff/conn/botany/lichens/index.htm Research project by Megan Kelso provides photographs and plenty of information on this lichen which can be found living on rocks close to the sea.
	Life on the Rocks - http://www.microscopy-uk.org.uk/mag/artjun02/pjlichens.html A peep into the world of lichens by Paul James with photographs of a number of species growing in Wales.
	A Lichen in Close-up - http://www.microscopy-uk.org.uk/mag/artoct03/arfungi.html Images of a lichen at three different magnifications, the most detailed showing the algal and fungal components.
	Peltigera aphthosa - http://www.borealforest.org/lichens/lichen8.htm Photograph and description of the freckle pelt or spotted dog lichen, its habitat and other notes.

	Cladina: Reindeer Lichens - http://www.borealforest.org/lichens/lichen3.htm Information and photographs of Cladina mitis, C. rangiferina and C. stellaris, their description, habitat and other notes.
	Cetraria islandica: Iceland Moss - http://www.pfaf.org/database/plants.php?Cetraria+islandica Information on the edible, medicinal and other uses of this lichen from the Plants for a Future database.
	Verrucaria mucosa - http://www.marlin.ac.uk/speciesinformation.php?speciesID=4573 Photograph and information on this maritime species and a map showing its distribution in Britain.
	Parelle: Ochrolechia parella - http://www.marlin.ac.uk/speciesinformation.php?speciesID=3933 Photograph and information on this maritime species with a map showing its distribution in Britain.
	Black Lichen: Lichina pygmaea - http://www.marlin.ac.uk/speciesinformation.php?speciesID=3671 Photograph and information on this maritime species and a map showing its distribution in Britain.

	Sea Ivory: Ramalina siliquosa - http://www.marlin.ac.uk/speciesinformation.php?speciesID=4235 Photograph and information on this maritime species and a map showing its distribution in Britain.
	Cladonia: Club Lichens and Cup Lichens - http://www.borealforest.org/lichens/lichen4.htm Photographs and information on these lichens, their description, habitat and other notes.
	Niebla and Vermilacinia Communities - http://www.worldbotanical.com/niebla_communities.htm Photographs and information on the lichens in the Ramalinaceae family found in California and Baja California.
	Ramalina fastigiata with Xanthoria parietina - http://www.clear-mind-photos.com/lichens_-_fruticose_-_on_bark/ramalina_fastigiata_with_xanthoria_parietina_070608_01.htm Photograph of these two lichens growing together on a branch.
	Reproduction and Reproductive Structures - http://www.earthlife.net/lichens/reproduction.html Outline with diagrams of the two fundamentally different sorts of reproductive bodies possessed by lichens, and the three main types of vegetative reproduction where pieces of lichen detach.

	The Earthlife Web Lichen Image Directory - http://www.earthlife.net/lichens/images/photos/thumbs/thumbs1.html About 40 images of lichens, including some unidentified ones.
	http://nativehawaiianflora.com/pages/l-n/lichen.html - http://nativehawaiianflora.com/pages/l-n/lichen.html Photographs of several species of lichen growing in their natural habitat in Hawaii.
	Plants Profile for Fayodia striatula - http://plants.usda.gov/java/profile?symbol=FAST Details of this lichenous member of the family Tricholomataceae.
	Orange Sea Lichen: Caloplaca marina - http://www.marlin.ac.uk/speciesinformation.php?speciesID=2863 Photograph and information on this maritime species with a map showing its distribution in Britain.
	Growth and Development in Lichens - http://www.earthlife.net/lichens/growth.html Each species of lichen has its own preferred substrate. This article describes how and where they grow and the extremes of climate that they can tolerate.

	Black Shields: Tephromela atra - http://www.marlin.ac.uk/speciesinformation.php?speciesID=4436 Photograph and information on this species with a map showing its distribution in Britain.
	Common Orange Lichen: Xanthoria parietina - http://www.marlin.ac.uk/speciesinformation.php?speciesID=4585 Photograph and information on this species and a map showing its distribution round the coasts of Britain.
	Lichen Images - http://www.wildaboutbritain.co.uk/gallery/browseimages.php?c=76&userid= Provides photographs of about 50 species.
	Tar Lichen: Verrucaria maura - http://www.marlin.ac.uk/speciesinformation.php?speciesID=4572 Photograph and information on this maritime species with a map showing its distribution round the coasts of Britain.
	The World of Lichenology - http://www.botany.hawaii.edu/cpsu/lichen1.html Information on the International Association of Lichenologists, photographs of various lichens and links to other lichen-related websites.

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