Question

If lichen was to disappear from a neighborhood (where it was growing well) should you be...

If lichen was to disappear from a neighborhood (where it was growing well) should you be concerned? If so why?

Homework Answers

Answer #1
  • Lichen is a symbiotic association of a photosynthetic organism and a saprophytic fungus.
  • The photosynthetic organisms may be cyanobacteria (cyanobiont) or green algae (phycobiont) and the fungi (mycobiont) may include group Ascomycetes or Basidiomycetes
  • Thy algae or cyanobacteria conduct photosynthesis and provides glucose, the fungal component provides water and nutrients.

Types include:

1. Crustose: Crust like hard on surface of trees, rocks.

2. Foliose: Leaf-like and loosely attached.

3. Fruticose: Perpendicular, Three dimensional.

  • Lichens are often indicators of air pollution.
  • They are sensitive to toxic air pollutants especially sulfur, nitrogen, mercury. They are inhibited in pollutive areas, like in case of acid rains.
  • If in an area, all three lichens types are visible- indicates good air quality.
  • Crustose and Foliose indicate average air quality.
  • Only crustose will indicate pollutants and poor air quality.
  • No lichens indicate a high level of air pollution and toxic air condition.
  • Thus, the disappearance of lichens from the neighborhood indicates increased air pollution and is a reason for concern.
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