"Allen mushroom"

The Allen Strain is a famous magic mushroom named after ethnomycologist John W. Allen who found it in 1991. The hallucinogenic specie was growing in rice paddie fields near the Muslim village of Ban Hua Thanon, on the island of Koh Samui in Thailand. The Allen Strain was the first bluing Psilocybe recorded from Thailand and the first species found outside of Mexico directly related to P. mexicana.
It also bears a striking resemblance to P. semilanceata aka Liberty Cap but hasn’t yet gained the name Thai Liberty Cap.

Today, this popular strain is often called Koh Samui or Thai. There is a bit of ambiguity around which mushroom is actually the Allen mushroom. 
A specie from the Bay Area California already bares Allen’s name, Psilocybe allenii, while another, Panaeolus cambodginiensis (also found by Allen), originates from the famous Angkor Wat temple in Cambodia.
Probably because Psilocybe Samuensis is the species indigenous to Thailand found by Allen, it is most likely to be the specie consumers refer to it as the Allen Strain.
Fun fact, Psilocybe samuiensis, which is originally from the province of Ranong in Thailand, was also found around the Angkor Wat temple where Panaeolus cambodginiensis grows.

So which magic mushroom strain is the real Allen Strain?
Feel welcome to share your thoughts in the review section!

Regardless which it is, the Allen Strain is a truly beloved strains for growers and consumers alike. Its growing pattern is often compared to the Floridian native P. tampanensis, in that it is resistant to contamination and a fast-colonizer. Needless to say, the Allen Strain is a “super strain”.

It is undeniable that the passionate Allen did his part in preserving the continuity of the endangered tropical mycoflora, and for that, he can have as many strains baring his name as he’d like!

Today the Allen Strain is consumed and cultivated worldwide, particularly amongst knowledgeable users. Its relatively strong effects makes its a good candidate for microdosing to improve performance or wellbeing.

Visual Description

Cap: 0.7-1.5 cm broad. Convex to conic-convex to bell-shaped. Apex often with a nipple-shaped umbo. Surface translucent-striate near margin, viscid when moist, with a seperable gelatinous pellicle. Color is chestnut to reddish brown to straw when young, strongly hygrophanous, will change in drying to straw or brownish. Gills: Attachement adnate. Color is clay, then purplish brown to chocolate purple. Margins remain whitish. Stem: 40-65 mm long by 1-2 mm thick. Whitish to yellowish, covered with fibrillose from veil remnant. Equal to slightly thicker at base. Bruising bluish when bruised. Spore print: purple brown. Microscopic features: 10-13 by 6.5-8µ Taste and odor: said to be bitter


MODERATE 0.25% - 0.75% HIGH > 0.75% - 2% Psilocybin levels varied from 0.23% up to 0.90%. The psilocybin content was highest in the caps. Psilocybin was also found in the cultured non-bluing mycelia and varied from 0.24% to 0.32% dry weight. Analyses of both naturally occurring and in vitro cultivated fruit bodies of P. samuiensis revealed high concentrations of psilocybin and psilocin. Small amounts of baeocystin were also detected (Gartz, Allen, Merlin, 1994).

Habitat Origin

Found in Kho Samui in Thailand and around the temple of Angkor Wat in Cambodia. Believed to be more widely distributed throughout those regions. It grows scattered to gregarious in rice paddies, fruiting season is not known but suspected to be late June to August, the latter being the month it was originally discovered. First picked in a soil containing a mixture of sand and clay in the region in Ranong province Thailand.


Said to be crucial to creative thinking, to boost mood, focus and energy. Potentially through targeting serotonergic 5-HT2A receptors and promoting cognitive flexibility, it boosts creativity and problem-solving performance. It has been associated with anti-depressive, anti-anxiety and anti-stress benefits.