Psilocybe samuiensis

Psilocybe samuiensis Guzmán, Bandala & Allen



Macroscopic feat.:
  • Cap/Pileus: 7 to 1.5 cm. Convex to conic-convex to campanulate, often umbonate with a small papilla. Translucent when moist, striate margin in young, and with a separate pellicle. Hygrophanous and fading to straw-yellow in drying.
  • Gills/Lamellae: Adnate and clay colored, than violaceous brown to chocolate-violet with whitish margins.
  • Stem/Stipe: 40 to 60 mm. long by 1-2 mm thick. Whitish to yellowish and covered with fibrils. Enlarged at base. Partial veil cortinate leaving a superior fibrillous annular zone that soon disappears.

Microscopic feat.:
  • Basidio/Spores: 9.3-13 x 5-7 µm. Sporeprint - chocolate to purple-brown.
  • Basidia: 4-spored.
  • Pleurocistidia: Scattered and ventricose towards the base.

Habitat: Grows in well manured clay-like soils in rice paddies and open grassy areas.

Distribution: Koh Samui Island in the Gulf of Thailand and surrounding areas. Ranong Province, Thailand and at Angkor Wat, Cambodia.

Season: Late may through September and possibly into October.

Dosage: 15-20 fresh mushrooms

Comment: So far this mushroom has only been found four times, fruiting in rice paddies from two locations on Koh Samui Island in the Gulf of Thailand. First in 1991 by John W. Allen in rice paddie fields near the Muslim village of Ban Hua Thanon, Koh Samui. Ten years later, a 2nd collection was gathered with Chief Ill Eagle, Travis Canaday, Nataya and Mike Acevedo, about 100 meters past where the first collection was found ten years earlier.
In 2003, JWA found 8 specimens in a second location a few miles down the road in the rice paddie fields of Na Muang, Koh Samui. And again in 2004, numerous collections were gathered from that same field during two separate fruitings in June and July of 2004. Its fruiting run is from 5 to 7 days and then they are gone from the fields.
Most likely it is probable that this species also fruits in other locations in southern Thailand and possibly Malaysia. It is not, as reported by http://www.petfungus.com found in Eastern Oregon. This species is closely related to Psilocybe mexicana Heim Heim and is macroscopically similar to Psilocybe semilanceata and is the first species found outside of Mexico directly related to Psilocybe mexicana Heim, That latter species is ceremoniously used by native Americans in Mesoamerica.

source - www.mushroomjohn.org

Pictures at www.mushroomobserver.org

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