Name: Psilocybe singularis Guzmán, Escalona & J.Q. Jacobs
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Rank: Species

Status: Accepted

Name: Psilocybe singularis

ICN Identifier: missing

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Author: Guzmán, Escalona & J.Q. Jacobs

Citation: International Journal of Medicinal Mushrooms (Redding) 6(3): 283 (2004)


Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Agaricales

Family: Hymenogastraceae

Genus: Psilocybe

Notes on Taxonomy: [Edit]

On bare clay soil, in mesophytic forest: Oaxaca

Brief Description: [See More | Edit]

Pileus 10–12 mm diam., conic-convex, subumbonate, smooth, slightly striate by translucence, lobu- lated to somewhat furrowed at the margin, opaque but lubricous, hygrophanous, ochraceous brown to fulvous, staining blue when touched. Lamellae sub- adnate, drab to dark violaceous brown, with whitish edges. Stipe 42–45 × 1.5–3 mm, uniform, base sub- bulbose, up to 4 mm wide, whitish to pale brown- ish, with purplish chestnut color at the top, smooth to somethat pruinose, covered with small whitish scales or fibrils longitudinally aligned and appressed toward the base, hollow. Context fleshy and whitish, caerulescent in the pileus, fibrous and brownish red in the stipe. Odor and taste not recorded. Mycelium at the base of stipe mustard brown.

Spores (5–) 6–7 (–7.5) × (4–) 5–5.5 (–6) × 4–5 μm, subrhomboid in face view, ellipsoid in side view, thick-walled, walls 0.5–1 μm thick, yellow- ish brown, with a broad germ pore. Basidia (15–) 19–32 × 5–7 (–8) μm, 4–spored, hyaline, ventricose, with a median constriction. Pleurocystidia 14–32 × 7.5–16 μm, common, hyaline, some with pale gray- ish tones, globose–ventricose, mucronate to ros- trate. Cheilocystidia (11–) 15–19 (–23) × (4–) 6–8 μm, hyaline, sublageniform, sometimes irregularly branched. Trama hymenophoral regular, with thin-walled, hyaline, somewhat incrusted hyphae, 2–13 μm wide. Subhymenium subcellular, with 1.5–6 μm wide, hyaline elements. Pileipellis a layer of postrated hyaline hyphae, 2–4 μm wide. Subpellis subcellular, with thin-walled, incrusted elements. Stipitipel- lis with postrated, hyaline, thin-walled, 1.5–5 μm wide hyphae, without caulocystidia. Caulocystidia very rare, the observed are 10–30 × 6–11 μm, hyaline, ventricose, with a broad or narrow base. Mycelium at the base of stipe with thick-walled hyphae, wall up to 1 μm thick, brownish yellow, 2–3 μm wide, with clamps. Clamp connections common.

Habitat and distribution. Subgregarious or solitary on red clay soil without vegetation, in a mesophytic forest. Known only from the type locality.

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