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THE THREE MAIN FORMS OF LICHENS (Comparison )

1. Crustose Lichen:

  • Crust like growth.
  • Thallus- Flat and Irregularly lobed
  • Fruiting body-small, apothecial type, containing asci and ascospores
  • Examples: Graphis, Rhizocarpon

2. Foliose Lichen:

  • Thallus- Flat,leaf-like, irregularly lobed
  • Rhizoid like outgrowths called rhizines develop on lower surface of thallus for attachment to the substaratum.
  • Mostly terricolous i.e. found growing on trees.
  • Examples: Physcia, Parmelia

3. Fruticose  Lichen:

  • Thallus is complex and much branched like a bush and attached to the substratum with the help of a flattened disc.
  • Fruiting body-Apothecial type
  • Mostly terricolous i.e. found growing on trees.
  • Examples: Evernia , Cladonia
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