The Mushroom Left the Mushroom
This week a team of metabolic engineers published something that should stop any mushroom person mid-scroll: they brewed psilocybin in E. coli. Not extracted it from mushrooms — built the fungal biochemistry into bacteria and ran it in a fermenter. The numbers are almost rude: 1.88 grams per liter of psilocybin, 1.62 grams per liter of DMT, pouring out of a steel tank that has never seen a fruiting body.
(Abrahms et al., "Genome-based optimization of psilocybin and N,N-dimethyltryptamine biosynthetic pathways in E. coli," Metabolic Engineering, 2026. PMID 42288133.)
We're a mushroom company that makes a quiet box for growing gourmet species on your counter. We are never going to make this, sell this, or tell you how to. But we cover the fungal world honestly, and this is the fungal world's frontier, so let's talk about what actually happened — and what it costs.
What they did, in plain terms
A mushroom that makes psilocybin does it with a short assembly line of enzymes — four main steps that turn the amino acid tryptophan into the finished molecule. Genes are just the blueprints for enzymes. So if you copy those four blueprints out of the mushroom and paste them into a bacterium, the bacterium can, in principle, run the same assembly line. Bacteria grow fast, cheap, and in enormous tanks. That's the whole idea, and people have chased it for years.
The hard part is never "can it work once." It's yield. Paste the genes onto a loose loop of DNA (a plasmid) and the cell makes a little, then loses the plasmid and quits. This team's move was to weld the assembly line directly into the bacterium's own chromosome — permanent, inherited every division — and then re-tune the volume knobs (a library of engineered promoters) until output climbed back to gram-scale. That's the advance: not the molecule, but making the molecule stable and abundant in an organism that isn't a mushroom.
Why a grower should care even though you'll never touch it
Here's the honest tension, and it's a good one to sit with while you mist your lion's mane.
What's gained: if a medicine works — and psilocybin is deep in FDA trials for treatment-resistant depression — then making it reliably, purely, and at scale is a genuine good. You don't want a pharmaceutical whose potency depends on which flush it came from. Fermentation gives identical molecules every batch. For a drug, sameness is safety.
What's lost: the mushroom is not just a psilocybin dispenser. It's a fruiting body with a texture, a smell, a place in a forest and a ritual, a hundred million years of coevolution with the primates who eventually noticed it. Pull one molecule out and grow it in a tank and you have the compound without the organism, the effect without the encounter. That may be exactly right for a clinical dose and exactly wrong for everything else people have ever sought from these fungi.
This is the same question we keep circling in this newsletter, just wearing a lab coat. Growing mushrooms is slow, particular, alive, and on its own schedule. A fermenter is fast, uniform, and indifferent. Both are real. But if you've ever waited five days for a flush and caught it at its peak, you already know something the tank can't tell you: the value was never only in the molecule. It was in the attention the living thing demanded of you.
Where we stand
We grow food. We think fungi are the most interesting kingdom alive and we're going to keep telling you what's happening at their edges — the medicine, the material science, the mycelium leather, the bacteria that now moonlight as mushrooms. Covering it is our job. Making it is not.
The mushroom left the mushroom this week. Worth noticing. Worth asking what we keep when we do that — and what quietly stays behind on the counter, still asking to be watched.
First Flush Friday is a weekly newsletter from Sh-Room about growing mushrooms at home. We cover the science and culture of the whole fungal kingdom. We make a countertop incubator for gourmet and culinary species only. Free, every Friday, unsubscribe anytime. sh-room.com/first-flush-friday