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The symbiotic relationship between mycorrhizae and plants is
mutualistic---one that benefits both partners.  The fungus makes the plant
more efficient at getting phosphorus from the soil, and possibly other
nutrients.  Whthout their mycorrhizae, land plants can hardly grow at all
when in competition with other plants that have mycorrhizae.  I have seen
mycorrhizae on of all things, Ceratophyllum, a plant that has no roots.
Nonetheless, all the parts of the stem which were in contact with the mud
had a dense coating of long fungal hyphae.

Paul Krombholz, in central Mississippi under cool high pressure with no
rain in sight for the next week.