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Question

What are the three types of lichens based on shape?


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Solution

Lichens:

  1. Lichens are organisms that are symbiotically associated between fungus and algae.
  2. They are found in rocks, tree barks, and gravestones.
  3. The three types of lichens based on their shape are: Crustose Lichens, Fruticose Lichens and Foliose Lichens.

Crustose Lichens:

  1. Crustose lichens form a crust which adheres strongly to the substrate.
  2. Crustose lichens show bright and vibrant colors like yellow, orange, red, green and grey.
  3. Example: Graphis, Lepraria and Lecidae.

Fruticose Lichens:

  1. Fruticose lichens have coral-like shrubby or bushy structures.
  2. Fruticose lichens are pendant and hair like or upright and cup-like.
  3. Example: Cladonia, Ramalina, Usnea.

Foliose Lichens:

  1. Foliose lichens grow on the tree trunks and on the rocks in shady woods.
  2. Foliose lichens are grey-green in color and form circular colonies.
  3. Example: Cetraria, Xanthoris, Parmelia

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