The letter's context
In the "Open Letter to the Mycological and Academic Community", published on the official Fungi Perfecti site, Paul Stamets sums up more than forty years of practical work with mycelium. The letter addresses the scientific community, environmental organizations and the general public at once. Its central motif is passing accumulated knowledge, patents and data into open access to accelerate the research Stamets himself considers critically important for the 21st century.
The adapted overview below is structured to separate documentarily confirmed points (the patent list, published work) from the author's hypotheses and personal position — the same approach used across this site (see About the project and Sources). A short Stamets biography for context is in Paul Stamets: a short biography of the mycologist, and a summary of his publications and directions is in the Paul Stamets and his work topic.
The letter's main theses
The letter consists of several thematic blocks. We grouped them into four directions, each backed by Stamets's own publications, peer-reviewed work and our adapted reviews.
Open-sourcing patents and data
Stamets announces the transfer of a number of patents related to mycelium and its extracts into an open-source regime for non-commercial use. This covers primarily patents concerning:
- mycelium-extract compositions for supporting honeybee health (formulations from 2010–2018);
- uses of the entomopathogenic fungi Metarhizium and Beauveria in integrated plant-protection schemes;
- mycoremediation methods based on the species studied in "Mycelium Running".
The goal is to let universities, non-profit laboratories and independent researchers use these developments without licensing fees. A detailed look at the bee work is in Mushrooms and bees: mycelium extract research, on entomopathogenic fungi in Entomopathogenic fungi: biological insect control, and on mycoremediation in Mycoremediation: how fungi clean soil and the Mycoremediation topic.
Old-growth forests as the planet's "bioarchive"
A separate section of the letter is devoted to old-growth forests. Stamets uses the concept of a "bioarchive" — ecosystems where unique strains of fungi, bacteria and other organisms have accumulated over millennia, many still undescribed. He contrasts old-growth forests with monoculture plantations and calls for their protection as a strategic ecological resource.
This position connects with the data on mycorrhizal networks and their role in forest ecosystems (see Mycorrhiza: how fungi feed the forest), and with the review of "Mycelium Running", where Stamets describes the concept of "mycoforestry" — forestry built on mycorrhizal connections: Mycelium Running — Stamets's main book.
Mycelium extracts and the bee "pandemic"
In the letter Stamets repeats the key theses of his long-running honeybee program. Among them:
- deformed wing virus (DWV) and associated infections are among the leading drivers of winter colony losses;
- in pilot work by Stamets's group (with the Washington State University lab), mycelium extracts of Ganoderma lucidum, Fomitopsis officinalis, Trametes versicolor and other species reduced DWV titres and improved overwinter survival;
- positive results were obtained on limited samples;
- the effect depends on concentration, delivery method and season;
- commercial Host Defense and Fungi Perfecti beekeeping products are registered in a number of countries, with different lineups and application schemes across markets.
An adapted overview of this work with its limitations is in Mushrooms and bees, and context on the key species in the reishi (Ganoderma lucidum) card and the Mushrooms and immunity topic.
Mycoremediation as an ecosystem-restoration tool
Stamets treats mycoremediation not as laboratory exotica but as a practical tool for regions hit by oil spills, pesticide pollution and industrial heavy-metal use. In the letter he stresses several principles:
- "No universal fungus" — for each pollutant type and each soil type a specific strain is selected, having passed laboratory screening and a field pilot;
- invasiveness risk assessment is required — wild isolates introduced into new ecosystems can disrupt the local mycobiota;
- scaling requires cooperation with environmental engineers and regulators, not only mycologists.
A detailed look at the direction is in Mycoremediation and the Mycoremediation topic hub. A consolidated overview of all four mycelium roles per Stamets is in Mycelium Running.
What the letter leaves out
As in Stamets's other materials, the "Open Letter" mixes strictly scientific claims with journalistic formulations. On this site we mark these differences so the reader sees where peer-reviewed data end and the author's personal position begins.
- "Saving the world" with fungi. Stamets has repeatedly used this rhetorical formulation in public lectures. In academia it reads as journalistic hyperbole rather than a scientific thesis. More on the criticism of "Mycelium Running" in the corresponding review: Mycelium Running.
- Mycelial "consciousness". In several talks Stamets uses language implying goal-directed behaviour of the fungal network. That remains a metaphor: among peer-reviewed work there is no consensus on mycelial "intentionality". The debate's context is in Mycorrhiza: how fungi feed the forest.
- Effectiveness of mycelium extracts for bees in broad practice. Positive results come from pilot work; large multicentre randomized trials continue to be published, and the overall picture is gradually being refined. This is noted in Mushrooms and bees and in the Mushrooms and immunity topic.
Reaction and context
At publication the letter sparked a wave of discussion in the mycological community and beyond. Some academic groups read the patent release as a gesture easing further research — and simultaneously as an admission that commercial frameworks do not cover the full range of tasks facing mycology. Others note that open licenses on individual patents do not remove the need for peer-reviewed publications and funding for field trials.
For the practical reader, the letter's meaning can be reduced to several theses on which we already have separate materials:
- Mushrooms alone will not "save" ecosystems — they are one tool alongside forest protection, pesticide regulation and biodiversity support. Covered in Mycoremediation and Mycorrhiza.
- Mycelium extracts for bees are a promising but not "ready-to-use" direction. Details in Mushrooms and bees.
- Old-growth forest protection is an ecological task in its own right, where mycology is secondary to forest policy. On our site this maps to the agarikon (Fomitopsis officinalis) card — a species whose populations directly depend on the preservation of old-growth coniferous forests.
Related materials
A consolidated path through the Stamets themes the letter touches is in the Paul Stamets and his work topic hub. From there it is easy to move to:
- Paul Stamets: a short biography of the mycologist — biography and the context behind Fungi Perfecti and Host Defense;
- Mycelium Running — Stamets's main book — the book review where the letter's theses originate;
- Mycoremediation: how fungi clean soil and the Mycoremediation topic;
- Entomopathogenic fungi;
- Mushrooms and bees;
- Beta-glucans and immunity and the Mushrooms and immunity topic.
You can subscribe to new materials, including future reviews on this topic, via RSS.