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.
Te whakamahi i tēnei tūemi
Archives New Zealand - Te Rua Mahara o te Kāwanatanga
Reference: AAQA 6500 Col1799
Photograph by John Johns
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