Algae, lichens and moss on trees and shrubs / RHS Gardening

Algae, lichens and moss often form green or grey, powdery or mossy, crusty growths on the stems, branches and trunks of trees and shrubs. While this can worry gardeners, these growths are harmless, although may occasionally indicate a lack of vigour in the affected plant.

I'm Liking the Lichens! - Coastal Interpretive Center

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Managing Pests in Gardens: Environmental Factors: Lichens, Mosses and Algae—UC IPM

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Moss and Lichens, Featured, The Garden, October 19, 2016

The Difference Between Lichens and Mosses — An Darach Forest Therapy

Lichens are harmless to trees

Pin on DC's Lichens and mosses

The Magic of Lichen—A Study – The Meaning of Water

Martha's Vineyard Magazine, Martha's Vineyard Magazine