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Crustose lichens are the most common type of lichen. They form a tight crust on the surface of rocks, tree bark or soil. This hardy lichen, Placopsis gelida, grows on exposed alpine rocks.
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Archives New Zealand - Te Rua Mahara o te Kāwanatanga
Reference: AAQA 6500 Col1799
by John Johns
Permission of Archives New Zealand Te Rua Mahara o te Kāwanatanga must be obtained before any re-use of this material.