As a result, many species have been based solely on their chemistry since the end of the nineteenth century. Lichen Identification: How are lichen species identified? … Lichenologist 29: 301-332. The classification of lichen, like that of fungi, are undergoing constant change. One method used for identification in lichens consists of some simple spot tests. Identification doubt because test with calcium hypochlorite positive red. Test with potassium hydroxide dark green (K+green). (C+red.) A Key to Sterile, Crustose, Saxicolous and Terricolous lichens of the British Isles. The gold dust crustose lichens of the Chrysothrix genus, such as C. xanthina shown here, are easily identified by their bright color. Aide Memoire: Usnea. Identification of crustose lichens is very challenging even with extant specimens, and often without precise information on anatomy (e.g. It grows only on constant surfaces and is never seen on changing substrates like riverbeds, stones or unconsolidated earth banks. The most conspicuous species of lichens on trees tend to be gray-green or yellow-green in color, but some may be orange, bright yellow, brown, slate blue, or black. There are about 15,000 described lichens which range in size from 1 mm to more then 3 meters, and come in many different colours and shapes. James, P. W. (2003). The growth and the structure of the lichen mainly depend on the environmental conditions and climate. Feb. 21, 2009 This warty crustose lichen grew on the bark of a maple tree at Tremont. Two of these tests have been used for over 100 years. There are three basic chemical tests that may or may not yield a color change when applied to a lichen. The color of the lichen body, known as a thallus, is very important for identification. Baeomyces rufus Baeomyces rufus on North facing partially sheltered stone dyke. Published by the British Lichen Society and is essential for anyone undertaking the identification of species in this genus. (Photo by Stephen Sharnoff, sharnoffphotos.com) Though lichens appear varied, they mostly adhere to the same basic structure. (xxxx). Crustose lichen grows at a very slow rate compared to others. 2012: 14: Smoky Eye Boulder Lichen Porpidia albocaerulescens Great Smoky Mountains NP Feb. 21, 2009 This is a very common crustose lichen that grows on the rocks in the park. Fryday, A. and Coppins, B. J.
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