FIGURE 1. The roots of up to 90 per cent of the trees in a forest can be colonized by many fungal species, the mycelia of which form ectomycorrhizal networks.

From the following article:

Mycorrhizal fungi:  The ties that bind

David Read

Nature 388, 517-518(7 August 1997)

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These networks, shown above linking two conifer species, provide channels for the transfer of nutrients. Simard et al.4 have now shown that considerable amounts of carbon can be transferred in either direction between trees through these networks.

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