Difference between revisions of "Lichen"

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== Description ==
 
== 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 [http://cameo.mfa.org/materials/fullrecord.asp?name=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:
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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 [http://cameo.mfa.org/materials/fullrecord.asp?name=lichen%20dyes 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
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== Authority ==
 
== Authority ==
  
* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "lichen" Encyclopdia Britannica    [Accessed April 26, 2002].
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* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "lichen" Encyclopædia Britannica    [Accessed April 26, 2002].
  
* G.Caneva, M.P.Nugari, O.Salvadori, G.Caneva, M.P.Nugari, O.Salvadori, ''Biology in the Conservation of Works of Art'', ICCROM, Rome, 1991
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* G.Caneva, M.P.Nugari, O.Salvadori, ''Biology in the Conservation of Works of Art'', ICCROM, Rome, 1991
  
  
  
 
[[Category:Materials database]]
 
[[Category:Materials database]]

Revision as of 07:56, 24 July 2013

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

Authority

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

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