Ectomycorrhizae and Endomycorrhizae
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Mycorrhizae, per Bio 2053, divide by where the fungus sits: ectomycorrhizae sheathe the root outside its cells, while endomycorrhizae penetrate the root cell walls.
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Ectomycorrhizae's fungal mantle around a conifer's roots reaches soil pores the bare root surface never could alone.
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Endomycorrhizae, found in most terrestrial plants, are far more common than ectomycorrhizae, typical of specific forest trees.