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The topic mor is discussed in the following articles:
A mor-humus formation, or raw humus condition, occurs in soil that has few micro- organisms or animals, such as earthworms, to decompose the organic matter that lies on the soil surface. Below this surface-litter layer is a distinct, strongly compacted humus layer; a layer of mineral soil underlies the humus. Fungi and small arthropods are the most common organisms. Mor soils are usually acidic...
The light-coloured, usually acidic soils of coniferous forests are called podzols (podsols) and have a compacted humus layer, known as mor, which contains many fungi. These soils are low in mineral content, organic material, and number of invertebrate animals such as earthworms.
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