Week 4: Espionage

Mycoheterotrophy — plants that take carbon from a shared fungal network without photosynthesising any back, and whether the network can tell.

TB0815 · diorama S. Brandt, NHM Basel · CC BY 4.0

Dispatch 04

Date: 15 March 2027
Metaphor: Espionage — extracting value from a network while paying nothing into it
Phenomenon: Mycoheterotrophy: plants such as Monotropa uniflora and many orchid species that draw carbon from mycorrhizal fungi without photosynthesising any back

Outline

full mycoheterotrophs: Monotropa uniflora (Indian pipe) and its relatives have no chlorophyll and take carbon entirely from ectomycorrhizal fungi that are also linked to a photosynthesising tree
the fungus in these cases typically gets nothing back from the mycoheterotroph — it keeps supplying the tree as usual, and the mycoheterotroph exploits a link that already exists for someone else’s benefit
initial mycoheterotrophy: orchid seeds carry almost no food reserve and germinate only with fungal carbon support; most orchids switch to photosynthesis as adults, some stay dependent for life
why “espionage” is not an overreach here the way week 3’s “aid” was: unlike a gradient-driven transfer, there is no reciprocal payment at all, and no market mechanism from week 2 that would obviously catch it
open question carried into weeks 5 and 6: does the network have any way to detect and cut this off, or is it close to undetectable free-riding