syn. Artylospora cinshonensis, syn. Psathyra cinchonensis)

Psilocybe mammillata is a rare species of magic mushroom easily recognizable by its acute nipple-like umbo. Said to be described from Jamaica in 1918 by Murrill, who placed it in the genus Astylospora, in 1948, Smith relocated it to Psilocybe and synonymized it with Artylospora cinshonensis (= Psathyra cinchonensis). Its bluish bruising flesh matched the characteristic of the hallucinogenic Psilocybe clade. Its epithet “mammillata” refers to its distinctive nipple-like umbo which often get him confused with Psilocybe cordispora.

Of the seven subpopulations known of this species, six are located in mountain cloud forests of Mexico, Bolivia and Jamaica, and one in Florida, making the Floridian subtropical forest its northernmost distribution limit.

Unfortunately, many of the mountain cloud forests have no conservation programs, making this extremely rare hallucinogenic mushroom most probably an endangered species.
Fortunately, the interest of magic mushroom hunters who consume it for its entheogenic properties, may be a helping factor in the conservation of the strain. Let’s hope this rare one gets cloned!

Visual Description

• Cap: 0.5-3 cm broad. Conic, soon broadening to campanulate at maturity, often with an umbo. Surface smooth when moist, slightly striated at margin, often with delicate residue of partial veil. Coloration reddish brown to brownish green, cap hygrophanous, dimming beige or dirty golden orange, occasionally blackish tones. Flesh pale brown and bruising bluish. • Gills: Attachment adnexed. Color pale brown to darkish purplish brown. Narrow, with whitish edges. • Stem: 15-30mm long by 1-2 mm thick. Equal, slightly thicker at base. Mycelium at base. Coloration yellowish when young, soon reddish brown, often maintaining white marks at base. Fesh reddish brown, bruising bluish. Partiel veil ring, fragile, soon disappearing in age. • Spore print: dark purplish brown. • Microscopic features: 5-6.5 by 3.5-5.5 µ. • Taste and odor: believed to be farinaceous.


MILD < 0.25% No data exists but believed to be active for its bluish bruising and said to be active by Guzman et al. (1993).

Habitat Origin

Originally found in Florida (Highland Hammock State Park). Also reported from Jamaica, Mexico, Bolivia. Growing alone or in group, in woody debris grounds, humus, and sometimes clay soils. Found along trails, shady banks, and in coffee plantations. Probably more widely distributed throughout Florida than currently reported because he is shadowed by his more popular relative P. cubensis, a preferred choice for mushroom hunters. Detailed locations: Mexico, Oaxaca: Road Oaxaca City to Pochutla, La Calera. Veracruz: West of Minatitlan North of Cosolacaque; Huayacocotla, La Selva; Road Jalapa-Perote, Plan de Serdeño. USA, Florida: Hammock State Park. Bolivia, La Paz: Nor-Yungas, Coroico. Jamaica, Cinchona State Park.


As no data on psilocybin levels exist for P. mammillata, we can only speculate it has similar psychotronic effects as other psilocybin species. Thus, effects would include: euphoria, visual stimulation with slight tracing effects, dilated pupils, enhanced heartbeat, occasional nausea. Nota bene: despite the literature that says that the mushroom has only been collected eight times since 1908, and the research in the genus that says that only seven subpopulations, and nine specimens are known, let’s keep in mind that there is scholar literature and popular literature.

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