The Melmac mushroom is a variety of Psilocybe cubensis that growers trace back to the famous Penis Envy line. It has thick, twisted stems, wavy caps and a backstory that involves a 1980s grow-kit company and a sitcom alien. It also has a reputation for strength that the research has not caught up with yet.
At STEM, we make measured psilocybin chocolate in small batches in BC, so we care a lot about what is in a mushroom and how much of it you take. Let’s break down what Melmac is, where it came from, how to spot one, what the science says about its potency and how it connects to the mushrooms in our own bars.
Melmac Mushroom at a Glance
| Trait | What the sources say |
|---|---|
| Species | Psilocybe cubensis |
| Family line | A variant of Penis Envy (DoubleBlind, GreenState) |
| Other names | “Melmac Penis Envy”, “Homestead Penis Envy” |
| Origin | Isolated by Homestead, late 1970s or 1980s |
| Look | Contorted, bumpy stems and wavy caps |
| Spores | Moderate sporulation, dark purple spores |
| Potency | Few tests on Melmac itself; potency varies widely across cubensis |
| Legal status in Canada | Illegal unless authorized by Health Canada |
What Is a Melmac Mushroom?
A Melmac mushroom is a strain of Psilocybe cubensis, the same species as Penis Envy and Enigma. DoubleBlind, a magazine that covers psychedelics, says Melmac mushrooms “produce psilocybin much like any other Psilocybe cubensis” (DoubleBlind).
What sets this strain apart is its family tree. Both DoubleBlind and GreenState describe it as a variant of Penis Envy, and DoubleBlind notes it is sometimes sold as “Melmac Penis Envy” or “Homestead Penis Envy” (GreenState). So when you see “melmac penis envy” on a label, the two names usually point to the same line.
Here is the honest summary before we go further: most of what is written about Melmac comes from growers and strain guides, not from lab studies. We will point out which parts are documented and which parts are still lore.
Melmac Mushroom History: From Penis Envy to Homestead
The Melmac story starts with Penis Envy. According to DoubleBlind, “In the 1980s, a company called Homestead began playing around with the original genetics of Penis Envy mushrooms.” GreenState describes Homestead as a publisher that sold at-home grow kits and says it “isolated the first Melmac from PE” in the late 1970s or 80s.
Those two dates do not line up perfectly, and that is normal for strain history. Much of it was passed between hobby growers long before anyone wrote it down.
Where the Melmac Name Comes From
If the name sounds familiar, you probably watched TV in the 1980s. DoubleBlind says Homestead most likely named the strain after Melmac, the fictional home planet of ALF from the sitcom of the same name. GreenState repeats the same story. In our opinion, it fits a mushroom with such an odd, alien shape.
Is Melmac the “Original” Penis Envy?
You will see claims that Melmac is closer to the original Penis Envy than the Penis Envy sold today. DoubleBlind mentions that some people suggest this and adds that “the validity of this claim is subject to debate.” We agree with that caution. Without genetic testing of the original cultures, nobody can settle it.
If you want the full story of the parent strain, our Penis Envy mushroom guide covers its origins and effects.
How to Identify a Melmac Mushroom
Melmac has a look of its own. DoubleBlind says that, compared with the original Penis Envy, “Melmac mushrooms have contorted stems and wavy caps.” GreenState describes “a bumpy, gnarled stipe (aka the stem) that can sometimes appear blue.”
Here is what that looks like up close:
- Stems: thick, bumpy and often twisted or curved.
- Caps: wavy or irregular rather than smooth and round.
- Colour: stems that can show blue patches, especially where they have been handled.
Next, let’s look at why that blue colour shows up.
Why Melmac Mushrooms Bruise Blue
The blue tint is not a Melmac quirk. It happens across psilocybin mushrooms. A 2020 study in Angewandte Chemie International Edition identified two Psilocybe cubensis enzymes behind it. One, called PsiP, removes a phosphate group from psilocybin to form psilocin. The other, PsiL, oxidizes psilocin, and the products link together into blue compounds (Lenz et al., 2020).
In plain terms, when the mushroom is cut or bruised, some of its psilocybin turns into psilocin and then into blue pigment. That is why bruised spots turn blue.
Melmac Mushroom vs Penis Envy: Spores and Shape
Spore production is one of the clearest differences between the two. DoubleBlind says Penis Envy is known for producing very few spores, even when fully mature, while it describes Melmac sporulation as moderate. It also says Melmac spores are a dark purple.
Shape is the other difference. Both have thick stems, and DoubleBlind says Melmac adds contorted stems and wavy caps compared with the original Penis Envy.
Melmac Mushroom Potency: What the Research Says
Many strain guides call Melmac one of the strongest cubensis varieties. We want to be straight with you about the evidence. DoubleBlind says there have not been many tests or comparisons of Melmac on its own, and that the potency of psilocybe mushrooms “depends mainly on their growing conditions.”
The best recent lab data shows why strain labels only tell part of the story. A 2026 study in the Journal of Fungi grew 14 strains of Psilocybe cubensis under the same controlled conditions. Total tryptamine levels varied by more than 7.8-fold between strains, from 2.62 to 20.65 mg/g. Even within a single strain, psilocybin varied by about 13% to 23% from one mushroom to the next (Sharchaton et al., 2026). That study included Penis Envy and Enigma. It did not include Melmac.
Health Canada makes the same point in plainer language: “the strength of magic mushrooms can vary greatly” (Health Canada).
Here is why that matters to you. A strain name does not tell you how much psilocybin is in the piece you are holding. A measured dose does.
Melmac Facts vs Strain Lore
Because so much is repeated online, here is how we sort what we know about Melmac:
| Claim | Status |
|---|---|
| It is a Psilocybe cubensis that produces psilocybin | Documented by DoubleBlind |
| It came from the Penis Envy line via Homestead | Reported by DoubleBlind and GreenState; exact date differs |
| It is closer to the “original” Penis Envy | Debated; no genetic testing we know of |
| It is stronger than other cubensis strains | Not tested in published lab work we found |
| Potency varies between and within strains | Documented in the 2026 Journal of Fungi study |
Melmac Mushroom Effects
Because Melmac is Psilocybe cubensis, its effects follow the same pattern as other psilocybin mushrooms. GreenState puts it simply: while Melmac may look different, “the effects will likely be similar.”
Health Canada says magic mushroom effects appear within 15 to 45 minutes and usually last four to six hours. People may feel heightened emotions and senses and may feel happy and creative. Physical effects can include numbness in the face and higher heart rate and blood pressure. DoubleBlind adds that nausea, anxiety, discomfort and distress can come with a psychedelic experience.
In our experience, the setting and the dose shape the experience far more than the strain name does. Our guide on how long mushroom chocolate takes to kick in walks through the onset, peak and comedown hour by hour.
Melmac Variations and Crosses
The Melmac line sits inside a larger Penis Envy family. DoubleBlind lists Albino Penis Envy, which came from crossing Penis Envy with PF Albino, and Trans Envy, a hybrid of Penis Envy and Transkei. You will also see names such as Albino Melmac sold online. We have not found a reliable source that documents where each Melmac variant came from, so treat vendor descriptions of them with care.
Makilla Gorilla: The Melmac Cross in Our Chocolate
This is where Melmac connects to STEM. Most of our bars list Makilla Gorilla as the mushroom variety, including our Dark Matter mushroom chocolate bar, our microdose bon bons and our psilocybin teas. We describe Makilla Gorilla as a cross of Penis Envy and Melmac in our Makilla Gorilla mushroom guide.
We do not sell a Melmac-only product. If you want the Penis Envy side of the family, our Penis Envy chocolate bars are made with that strain.
Melmac or Not: Why a Measured Dose Matters More Than the Strain
Here is the part we care about most. A strain name on a bag of mushrooms or a candy bar tells you very little about the dose. Researchers at Oregon State University bought 12 “magic mushroom” edibles in Portland, Oregon and found that none of them contained psilocybin, and seven held ingredients that were not on the label (Oregon State University).
That is the problem we set out to solve. Our product pages list the mushroom variety and the amount per piece. Our standard 3 g bars split into 15 pieces of 200 mg, so you know what each piece holds before you take a bite.
How to Dose Melmac Mushroom Chocolate Safely
Because potency varies so much between mushrooms, we think the safest approach is a measured amount and patience. Next steps for a first try with any psilocybin chocolate:
- Start small. With a standard STEM 3 g bar, that means a half piece (100 mg) or a quarter piece (50 mg).
- Wait two hours. Psilocin peaks in the blood about 2 hours after an oral dose (Holze et al., 2023), so do not take more in that window.
- Keep it simple. Health Canada warns that mixing magic mushrooms with cannabis, amphetamines or alcohol raises the risk of serious side effects.
- Write it down. Note the dose, the time and how you felt, then adjust slowly in later sessions.
Our mushroom chocolate dosage chart shows how to cut each STEM bar into smaller doses.
Is the Melmac Mushroom Legal in Canada?
No more than any other psilocybin mushroom. Health Canada states that the production, sale and possession of magic mushrooms are illegal in Canada unless Health Canada authorizes them, and that no therapeutic product containing psilocybin is approved. Health Canada also notes that people with heart conditions, or with existing psychiatric conditions or a predisposition to them, may face higher risks.
Our guide to whether psilocybin chocolate is legal in Canada explains the current rules. STEM chocolates are not intended to diagnose, treat or cure any condition.
Melmac Mushroom FAQs
Is Melmac stronger than Penis Envy?
Nobody has shown that in a lab. DoubleBlind notes that there have been few tests of Melmac on its own, and the 2026 Journal of Fungi study of 14 strains did not include it. That study did show that potency varies widely between and within strains.
Is Melmac a type of Penis Envy?
Yes, by most accounts. DoubleBlind and GreenState both describe Melmac as a variant isolated from Penis Envy, and it is sometimes sold as “Melmac Penis Envy”.
Why is it called Melmac?
DoubleBlind says Homestead most likely named it after Melmac, the home planet of ALF in the 1980s sitcom.
What does a Melmac mushroom look like?
Look for thick, bumpy, twisted stems and wavy caps. The stems can show blue patches where they have been handled.
Does Melmac produce spores?
Yes. DoubleBlind describes Melmac sporulation as moderate, with dark purple spores, while Penis Envy produces very few spores.
Is Melmac a good strain for beginners?
We suggest that anyone new to psilocybin focus on the dose, not the strain. Start with a small, measured amount on a calm day and wait two hours before taking more.
How long does a Melmac trip last?
Health Canada says magic mushroom effects usually last four to six hours, and we have not found published evidence that Melmac differs from other cubensis strains here.
Does STEM sell Melmac mushroom chocolate?
Not as a Melmac-only bar. Most STEM bars use Makilla Gorilla, which we describe as a cross of Penis Envy and Melmac.
Want to try a strain you can dose with confidence? Browse the STEM psilocybin chocolate shop, read our guide to the rare Enigma mushroom, or visit the STEM homepage to learn how we make our chocolate. We believe that by changing our minds, we can change our lives.
