Medicinal Mushrooms as Plant Allies: Reishi & Lion's Mane Guide

There's a moment, every early summer, when the forest floor starts whispering in a different register. The spring ephemerals have gone to seed, the ferns have unfurled, and underground — humming through every inch of duff and rotting log — the mycelium is doing its quiet, ancient work. This is the week we're calling Mycelium & Magic, and we're starting where the witch's apothecary has always started: with the fungi that bridge folk practice and peer-reviewed science.

Mushrooms aren't pharma. They're not woo, either. They're plant allies in the oldest sense — beings with histories, personalities, and chemistries that have been catalogued by grimoires and gas chromatographs alike. Let's meet four of them.

Reishi: The Mushroom of Immortality, Now With Citations

Reishi (Ganoderma lucidum) is the elder of the apothecary. Reishi mushrooms have been used in Chinese Medicine for over 2,000 years, making them one of the oldest mushroom species known to be used medicinally, and were originally thought to be an elixir of life for gaining immortality. In Chinese medicine it's called Lingzhi (靈芝), meaning "spirit plant" or "divine mushroom," a name used for over 2,000 years; in Japanese Kampo it's Reishi (霊芝), and in Korean traditional medicine it's Yeongji.

This is a mushroom with mythology baked in. Magu, a figure in both Chinese and Korean literature, is typically portrayed as having healing powers and as having gifted the world with the healing herbs of cannabis and reishi. Reishi was valued by Taoist monks for both its properties of increasing health and aiding the development of spiritual experiences, and was said to "absorb earthly vapors and leave a heavenly atmosphere."

The lab agrees that something interesting is happening. Studies primarily concentrate on three phytochemicals derived from Ganoderma lucidum: polysaccharides (mostly beta-glucans), sterols, and triterpenes. Those beta-glucans are the throughline of every mushroom in this article — they're how fungi talk to your immune system.

Shadow work, decoctions, and why you need alcohol and water

Here's the practical witchcraft. Reishi is a polypore — leathery, woody, bitter. You cannot simply steep it like chamomile and get the goods. To unlock the full potential of reishi mushroom benefits, a dual extraction process involving hot water and alcohol is necessary; this method ensures that all the potent compounds become bioavailable.

The reason is alchemical and chemical at once:

Water (long decoction, 2–4 hours minimum): pulls the water-soluble beta-glucans out of the chitin cell walls.
Alcohol (high-proof tincture, weeks-long maceration): pulls the triterpenes — the bitter, resinous compounds responsible for reishi's calming, "shen-tonic" reputation.

This is why a proper reishi tincture is a slow medicine. It's also why reishi is the mushroom we reach for during shadow work — the bitter decoction tastes like sitting with something hard. Brew it at the dark moon. Sip it before journaling. Let the bitterness do what bitterness does: drag what's underneath up into the light.

Lion's Mane: Cognitive Clarity as a Kind of Glamour

If reishi is the grandmother, lion's mane (Hericium erinaceus) is the strange, shimmering apprentice. It grows in white cascading icicles off hardwoods, looks like a sea creature, and tastes like crab.

In Chinese and Japanese medicine it has a long history as a tonic for the digestive tract and the mind. The modern science is where it gets witchy. Lion's Mane stands out as a rare botanical with the potential to do something truly remarkable: stimulate the regeneration of nerve cells, and at the heart of this brain-boosting benefit lies a key biological player — Nerve Growth Factor (NGF), a protein that acts like brain fertilizer, helping neurons grow, repair, and communicate more effectively.

Terpenoids such as hericenones and erinacines have been shown to stimulate nerve growth factor (NGF) synthesis, promoting neuronal growth and repair. Erinacines can enter the brain, likely because the molecules are smaller than those of neurotrophic factors — meaning they can cross the blood-brain barrier that most therapeutic proteins can't.

A 2023 Queensland Brain Institute study went further: scientists reported that the active compound from Hericium erinaceus can enhance nerve growth and boost memory through a pan-neurotrophic pathway in central hippocampal neurons converging to ERK1/2 signaling enhancing spatial memory.

We think of lion's mane as a glamour in the old sense — not vanity, but the spell of being clearly seen, clearly thinking, clearly here. Take it as a morning tincture or sauté the fresh fruiting bodies in butter. Both work. (Honest caveat: cognitive effects with Lion's mane have been mixed based on small and short-duration clinical trials. The folk and the preclinical evidence are ahead of the human trials. Work with it, but don't worship it.)

Turkey Tail and Shiitake: The Kitchen Allies

Turkey tail (Trametes versicolor) is the prettiest mushroom in the woods and one of the most studied. PSK is a proteoglycan extract derived from Turkey Tail mushroom; it consists primarily of beta-glucans bound to proteins and has been studied extensively in Japan as an adjunct in immune-related research. When PSK binds TLR2, researchers found it triggered maturation of dendritic cells, increased production of IL-12, and enhanced the activity of natural killer (NK) cells and CD8+ T cells.

Shiitake is the everyday witch's broth. Lentinan extracted from shiitake (Lentinula edodes) is a β-glucan that has been reported as an intravenous anti-tumor polysaccharide via enhancement of the host immune system. By binding to membrane receptors such as TLR2/4/6/9 and Dectin-1, β-glucan activates signalling pathways including MAPK-NFκB and Syk-PKC, stimulating immunocytes such as NK cells, macrophages and T cells.

In practice: a long shiitake-and-kombu broth simmered for hours, salted, sipped from a small cup, is everyday medicine. No mortar required.

What's Underground in Early Summer

Right now, in early June, the forest is full of:

Reishi primordia — the bright orange "antlers" emerging on hemlock and oak stumps before they flatten into shelves
Chicken of the woods flushes on oak
Early oyster mushrooms after rain
Last year's turkey tail still good for tincture

This is foraging season. Get a guidebook. Get a teacher. Don't eat anything you can't identify three ways.

Key Takeaways

Reishi carries 2,000+ years of documented use and needs dual extraction (water + alcohol) to release both beta-glucans and triterpenes.
Lion's mane contains hericenones and erinacines that stimulate NGF and can cross the blood-brain barrier — preclinical evidence is strong; human trials are still small.
Turkey tail's PSK works as a TLR2 agonist, activating dendritic cells and NK cells.
Shiitake's lentinan is one of the most-studied immunomodulatory β-glucans — and lives in your soup pot.
The folk lineage and the lab evidence are not in conflict. They are describing the same allies in two languages.

Medicinal Mushrooms as Plant Allies: Reishi, Lion's Mane, and the Witch's Apothecary