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Rhizocarpon geographicum (the map lichen) is a species of lichen, which grows on rocks in mountainous areas of low air pollution. Each lichen is a flat patch bordered by a black line of fungal hyphae. These patches grow adjacent to each other, leading to the appearance of a map or a patchwork field.
Louisiana Department of Wildlife and Fisheries, LaSalle Parish School Board, and the U.S. Army Corps of Engineers [7] Elbow Slough Wildlife Management Area Rapides 160 Louisiana Department of Wildlife and Fisheries Elm Hall Wildlife Management Area: Assumption: 2,839 Louisiana Department of Wildlife and Fisheries [8] Esler Field Wildlife ...
English: This is a cross section of lichen, which is an organism in a symbiotic relationship between green algae and fungus. 1. Thick layers of hyphae, called the cortex 2. Green algae 3. Loosely packed hyphae 4. Anchoring hyphae called rhizines. Lichen is an organism that is composed of two separate organisms living in a symbiotic relationship.
The map lichen (Rhizocarpon geographicum), the lichen most used in lichenometry. Lichenometry can provide dates for glacial deposits in tundra environments, lake level changes, glacial moraines, trim lines, palaeofloods, [9] rockfalls, seismic events associated with the rockfalls, [2] talus stabilization and former extent of permafrost or very persistent snow cover. [10]
Rhizocarpon is a genus of crustose, saxicolous (or sometimes lichenicolous), lecideoid lichens in the family Rhizocarpaceae.The genus is common in arctic-alpine environments, but also occurs throughout temperate, subtropical, and even tropical regions.
Lecanora louisianae is a species of corticolous (bark-dwelling), crustose lichen in the family Lecanoraceae. It was formally described as a new species in 1932 by French lichenologist Maurice Bouly de Lesdain. [1] It is common and widespread in the Coastal Plain region of southeastern North America. [2]
Lichenometry relies upon the fact that the maximum diameter of the largest thallus of an epilithic lichen growing on a substrate is directly proportional to the time from first exposure of the area to the environment as seen in studies by Roland Beschel [24] in 1950 and is especially useful in areas exposed for less than 1000 years. Growth is ...