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Psilocybe allenii

Psilocybe allenii, another gem from the Pacific Northwest. With a distinctive caramel-brown cap and pale gills that turn bluish with age, these mushrooms offer a real visual treat.

It belongs to the Hymenogastraceae family and was discovered and introduced to science in 2012. It’s named after John W. Allen, the researcher who discovered it. Being a part of the Psilocybe mushrooms crew, P. allenii contains psilocin and psilocybin, the active compounds found in this genus.

Source: Psilocybe allenii Borov., Rockefeller & P.G.Werner

Dive in to discover the structure, habitat, and similar species of this notable member of the  Psilocybe genus.

The structure of Psilocybe allenii

Cap The caps are 0.6–3.5 inches, and range from broadly convex to flattened, sometimes with a slight depression in the center. The cap margin is either straight or slightly curved and sometimes has radial grooves.

Initially cream to pale gray-brown, but become dark purple as the spores mature.


Cylindrical and hollow stipe is typically 1.6–2.8 inches long, the base slightly thicker. The stipe surface is smooth to silky fibrillose, initially white before yellowing slightly.


A white partial veil that disappears or sometimes sticks around enough to be colored purplish brown by spores.


When bruised it stains dark blue.


Spores are thick-walled with an apical pore, and elongated ellipsoid in face view. Typically, measuring 12.0–12.6–13.1 by 6.8–7.1–7.4 μm.

Spore print

Spore prints are dark brown, sometimes with violet shades.

Habitat and Distribution

These mushrooms thrive on decaying wood, especially wood chips used in gardens. They like to grow solo, in small groups, or sometimes in clusters on rotting wood. They enjoy hardwood mulches made from oak, eucalyptus, Douglas fir, and alder.

Source: Psilocybe allenii Borov., Rockefeller & P.G.Werner

When temperatures drop, from late September to January, that’s when they decide it’s time to shine.

Found in the northwestern part of North America, stretching from British Columbia down to Los Angeles, California. You’ll spot it mostly within about ten miles of the Pacific coastline, but it’s been found even 100 miles inland.

Similar species 

There are a number of Psilocybe species that might look similar to P. allenii, but you can spot the differences in their appearance or where they grow.

  • P. serbica var. moravica – A bit slimmer than P. allenii.
  • P. Cyanescens – You can’t tell them apart with a microscope, but it has a wavy cap, grows from September to April, and doesn’t have that ring on its stipe like P. allenii.
  • P. Azurescens – It has a wider cap, a bumpy umbo, a longer stipe (up to 20 cm), and a similar growing season to P. cyanescens.
  • P. subaeruginosa – This one comes from Australia, but needs more research to be properly compared.

    Discovering the Enchanting Enigma of Spores 

    Let’s dive into the fascinating realm of fungi and discover the intricate details of mushroom spores. No need to wait – you can start your research journey here. Check out Fungushead and discover our awesome lineup of Psilocybe cubensis mushroom spore syringes, swabs, and mixpacks.

    Top-Notch Spores

    Quality is key for us. Each strain is handpicked from isolated sources for the best genetics.

    Pristine Deionized Type 2 Water

    Our syringes are filled with super-purified water, acting like a shield against any contaminants.

    Viability Check

    Our spores get regular check-ups to ensure they’re viable and ready for your exploration.

    Ready for ID Each syringe is labeled with the strain name and even shows you what that strain looks like when fully grown.

    All of the content and images on our site are for informational reference only. The cultivation of psilocybin mushrooms is illegal in the United States. We do not promote the cultivation of psilocybin mushrooms under any circumstances. Do not contact us asking for advice related to this subject. Any products found on this site are for microscopy and taxonomy purposes only. None of the mushroom spores we offer are for consumption or cultivation. We do not sell any products containing psilocybin.


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