Lichens of North America - Details of the book of this name, and an interesting introduction to the biology of lichens and their relationships with man and the environment. LIAS - Provides a global information system for lichenized and non-lichenized ascomycetes. Lichens: Dual Organisms - 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 - An illustrated introduction to the lichens with information on their ecology and reproduction. Introduction to Lichens - A lichen is a combination of two organisms which live together intimately. Information on their fossil record, life history and ecology, systematics and morphology. The Earthlife Web Lichen Image Directory - About 40 images of lichens, including some unidentified ones. Lichen Pictures - 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. Reproduction and Reproductive Structures - 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. Growth and Development in Lichens - 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. Walton Hall Nature Trail - Take a walk through the churchyard to see what lichens grow on the different man-made outcrops of stone. Lichen Determination Keys Available on the Internet - Provides links to keys providing details of the lichens that can be found in many countries throughout the world. Cryptothecia rubrocincta, the Christmas Lichen - Photographs and article by Tom Volk on this spectacular lichen which can be found in the tropical regions of the Americas. FIA Lichen Indicator - 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. Catalog of California Lichens - 1575 species have been identified from this state, the great geographic diversity being responsible for the relatively large number of lichens found. Life on the Rocks - 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 - Images of a lichen at three different magnifications, the most detailed showing the algal and fungal components. Cladonia cristatella - Article by Tom Volk on the British soldier lichen, where the fungal element is associated with the green alga, Trebouxia erici. Cladonia rangifera - Article by Tom Volk on this lichen, often known as Reindeer Moss, and on lichens in general. Peltigera aphthosa - Photograph and description of the freckle pelt or spotted dog lichen, its habitat and other notes. Cladina: Reindeer Lichens - Information and photographs of Cladina mitis, C. rangiferina and C. stellaris, their description, habitat and other notes. Cladonia: Club Lichens and Cup Lichens - Photographs and information on these lichens, their description, habitat and other notes. Niebla and Vermilacinia Communities - Photographs and information on the lichens in the Ramalinaceae family found in California and Baja California. British Soldier Lichen - Student project on Cladonia cristatella with classification, habitat, phylogenetics and environmental interactions. Plants Profile for Fayodia striatula - Details of this lichenous member of the family Tricholomataceae.