Glossary of lichen terms
This glossary provides an overview of terms used in the description of lichens, composite organisms arising from algae or cyanobacteria living symbiotically among filaments of multiple fungus species. Erik Acharius, known as the "father of lichenology," coined many lichen terms still in use today around the turn of the 18th century. Before that, only a couple of lichen-specific terms had been proposed. Johann Dillenius introduced  in 1742 to describe the cup-shaped structures associated with genus Cladonia, while in 1794 Michel Adanson used  for the furrowed fruitbodies of the genus Graphis. Acharius introduced numerous terms to describe lichen structures, including , , , , , , and . In 1825, Friedrich Wallroth published the first of his multi-volume work Naturgeschichte der Flechten ("Natural History of Lichens"), in which he proposed an alternative terminology based largely on roots from the Greek language. His work, presented as an alternative to that of Acharius (of whom he was critical) was not well received, and the only terms he proposed to gain widespread acceptance were  and ,  and , and , the last of which remained in use until the 1960s. Until about 1850, there were 21 terms for features of the lichen thallus that remain in use today. The increasing availability of the optical microscope as an aid to identifying and characterizing lichens led to the creation of new terms to describe structures that were previously too small to be visualized. Contributions were made by Julius von Flotow (e.g. ), Edmond Tulasne (e.g ), and William Nylander (e.g. , ). Gustav Wilhelm Körber, an early proponent of using spore structure as a  in lichen taxonomy, introduced , , and "polari-dyblastae", later anglicized to "polari-bilocular" and then shortened to . In the next five decades that followed, many other additions were made to the repertoire of lichen terms, subsequent to the increased understanding of lichen anatomy and physiology made possible by microscopy. For whatever reasons, there were not any new terms (still currently used) introduced from the period 1906 to 1945, when Gustaf Einar Du Rietz proposed replacing  and  with  and ; all four terms remain in use. In some cases, older terminology became obsolete as better understanding of the nature of the fungal–algal relationship led to changes in their terminology. For example, after Gunnar Degelius objected to the use of  for the algal partner, George Scott proposed the use of  and  for lichen components, recommendations that were generally accepted by lichenologists. This glossary includes terms defining features of lichens unique to their composite nature, such as the major components the two major components of lichens ( and ); specialized structures in lichen physiology; descriptors of types of lichens; two- and three-dimensional shapes used to describe spores and other lichen structures; terms of position and shape; prefixes and suffixes commonly used to form lichen terms; terminology used in methods for the chemical identification of lichens; the names of 22 standard insoluble lichen pigments and their associated reference species; and "everyday" words that have a specialized meaning in lichenology. The list also includes a few historical terms that have been supplanted or are now considered obsolete. Familiarity with these terms is helpful for understanding older literature in the field. A

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See also

 Glossary of biology
 Glossary of mycology
 Glossary of scientific naming
 List of common names of lichen genera
 List of Latin and Greek words commonly used in systematic names

Citations

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Lichens
Glossaries of biology
Wikipedia glossaries using description lists