Allen strain was originally found in Thailand by John Allen, and therefore bears resemblance to many southeastern asian strains.
It is a vigorous colonizer that fruits tall and slender mushrooms. It frequently produces a pronounced umbo (bump) in the centre of the frequently bell shaped brown/tan pileus (cap). It stipe is slender and more pliable than other cubensis, making the fruit body often lean heavily. Its sporation is very dark (almost black)
It is well reviewed in regards to both potency and cultivation on multiple forums. Effects include bodily vibration and mild visual stimulation.