Difference between revisions of "Lichen"

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Any of about 18,000 thallophytic organisms composed of an algae and a fungus growing in a symbiotic relationship on a solid substrate, such as a rock.  Lichen have been used since ancient times as a source of food, medicine and [[lichen dyes|dyes]].  Lichens grow relatively slowly (about 0.1 - 10 mm per year).  Algae perform phtosynthesis producing carbohydrates and vitamins while the fungi absorb water vapour and provide a protective environment for the delicate algae.  Their composite body is called a thallus and is classified as:
 
Any of about 18,000 thallophytic organisms composed of an algae and a fungus growing in a symbiotic relationship on a solid substrate, such as a rock.  Lichen have been used since ancient times as a source of food, medicine and [[lichen dyes|dyes]].  Lichens grow relatively slowly (about 0.1 - 10 mm per year).  Algae perform phtosynthesis producing carbohydrates and vitamins while the fungi absorb water vapour and provide a protective environment for the delicate algae.  Their composite body is called a thallus and is classified as:
  
- squamulose: small, flat scales that do not adhere tightly to substrate
+
* squamulose: small, flat scales that do not adhere tightly to substrate
 +
* crustose: flat, firmly attached to substrate
 +
* foliose: leaf-like lobes, attached in the center to substrate by clusters of hyphae (rhizones); may reach several feet in diameter
 +
* fructicose: plant-like growth attached at one point or cluseter called a holdfast
  
- crustose: flat, firmly attached to substrate
+
== Resources and Citations ==
  
- foliose: leaf-like lobes, attached in the center to substrate by clusters of hyphae (rhizones); may reach several feet in diameter
+
* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "lichen" [Accessed April 26, 2002].
 
 
- fructicose: plant-like growth attached at one point or cluseter called a holdfast
 
 
 
== Sources Checked for Data in Record ==
 
 
 
* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "lichen" Encyclopædia Britannica    [Accessed April 26, 2002].
 
  
 
* G.Caneva, M.P.Nugari, O.Salvadori, ''Biology in the Conservation of Works of Art'', ICCROM, Rome, 1991
 
* G.Caneva, M.P.Nugari, O.Salvadori, ''Biology in the Conservation of Works of Art'', ICCROM, Rome, 1991

Revision as of 10:16, 26 June 2020

Lichen

Description

Any of about 18,000 thallophytic organisms composed of an algae and a fungus growing in a symbiotic relationship on a solid substrate, such as a rock. Lichen have been used since ancient times as a source of food, medicine and dyes. Lichens grow relatively slowly (about 0.1 - 10 mm per year). Algae perform phtosynthesis producing carbohydrates and vitamins while the fungi absorb water vapour and provide a protective environment for the delicate algae. Their composite body is called a thallus and is classified as:

  • squamulose: small, flat scales that do not adhere tightly to substrate
  • crustose: flat, firmly attached to substrate
  • foliose: leaf-like lobes, attached in the center to substrate by clusters of hyphae (rhizones); may reach several feet in diameter
  • fructicose: plant-like growth attached at one point or cluseter called a holdfast

Resources and Citations

  • G.Caneva, M.P.Nugari, O.Salvadori, Biology in the Conservation of Works of Art, ICCROM, Rome, 1991

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