Field Notes
5:00 am
Fri July 4, 2014

Pinedrops

Woodland pinedrops, Pterospora andromedea Nutt. (CC-BY)
Woodland pinedrops, Pterospora andromedea Nutt. (CC-BY)
Credit Dave Powell, USDA Forest Service, Bugwood.org

7/6/14 & 7/7/14: This week on Fieldnotes: "Pinedrops," by Peter Lesica, read by Anne Garde.

"All of our conifers form a symbiotic partnership with certain soil fungi. The fungus helps the tree get minerals and in return receives energy-rich carbohydrates. Pinedrops (Pterospora andromedea) insinuates itself into this partnership by taking some of those carbohydrates from the fungus.

However, pinedrops is not a freeloader; it passes along a growth stimulant to the mycorrhizal fungus. Radioactive phosphorus injected into pinedrops appears later in adjacent trees. That's why pinedrops is found only near conifers. In this three-way mutualism, everybody wins." 

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