Public Description of Psilocybe mendica E. Horak & Desjardin

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Name: Psilocybe mendica E. Horak & Desjardin
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Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Hymenogastraceae

General Description:

Pileus 5 -12 mm diam., convex at first, later expanded or concave with margin up-turned, always with a distinctive, sharply pointed papilla, ochre to beige when moist, becoming paler when dried, hygrophanous, innately fibrillose, margin non-striate. – Veil remnants scarce and inconspicuous, forming pallid, small, triangular, fibrillose and ephemerous squamules towards margin of pileus. – Lamellae 32-40 reaching stipe, lamellulae in 3 – 7 series, broadly adnate to subdecurrent, less than 1 mm wide, brown with a distinctive lilac tint, even edges concolorous. – Stipe 10 – 20 × 0.5 – 1 mm, cylindrical, equal, concolorous with pileus, minutely fibrillose, dry, hollow, flexible, solitary, remnants of veil absent. – Context concolorous with pileus, not staining. Odor and taste not distinctive.

Spore print brown, with distinctive lilac tint.

Basidiospores 5.5 – 7 × 4-4.5 × 3.5-4 um, subovoid (to subrhomboid) in face view, ellipsoid in side view, thin-walled, smooth, pale yellow-brown, with distinctive germ pore. Basidia 15-25 × 6-8um, 4-spored, hyaline, subclavate, occasionally with median constriction. Cheilocystidia (15-) 20-35 × 7-13 um, hyaline, thin-walled, polymorphic, shape ranging from vesiculose to broadly ventricose, broadly fusoid or utriform, apex lacking mucro. Pleurocystidia absent. Caulocystidia clavate to subfusoid or cylindrical, in- conspicuous. – S u b h y m e n i u m composed of hyaline to yellowish, thin-walled hyphae, 5-13 |im diam. – Trama subregular, composed of hyaline or yellowish hyphae, 3.5 – 17 (-21) urn diam. – Hyphae of veil 1.5-3 (im diam. – Pileipellis a cutis composed of cylindrical, non-gelatinized, thin-walled hyphae, 3 – 6 urn diam., encrusted with pale brown pigment. – Subpellis composed of ovoid, hyaline or yellowish cells, 10-16 urn diam. – Hyphae of veil remnants (on pileus surface) cylindrical, hyaline, 1,5-3 (im diam., terminal cells not differentiated. -Clamp connections present.

Etymology: mendicus (Lat.) – poor, inconspicous.

Specimens examined: INDONESIA: Bali, Bedugul, Lake Bratan, trail to Mt. Catur, 16 Jan 2000, leg. E.Horak ZT 8436 (holotype, BO, isotype XAL). – Bali, Bedugul, Eka Karya Botanical Garden, 17 Jan 2000, leg. E.Horak 8437 (BO 00-258, ZT).

Habitat and Ecology: Saprobic. – On rotting organic debris (leaves, twigs) of dicot trees, gregarious, in tropical-montane broadleaf rain forest, 1350 m alt.

Distribution: Indonesia: Bali (recorded only from and near the type locality).

Discussion: Psilocybe mendica is well characterized by its minute basidiomes. Taxonomically, it belongs to sect. Pratenses because of its subovoid or ellipsoid, thin-walled basidiospores and the lack of pleurocystidia (Guzman 1983, 1995). The taxon is well separated from other members in this section by the polymorphic and comparatively large and broad cheilocystidia.

Psilocybe mendica and Ps. inconspicua Guzman & E. Horak (1979) from Papua New Guinea represent the first two tropical species in sect. Pratenses so far described from SE-Asian localities. The two taxa of rather small-sized basidiomes are readily distinguished by the shape of the pileus viz. with sharply acute papilla in Ps. mendica, in contrast to the blunt umbo in Ps. inconspicua. Furthermore, Ps. mendica is distinctly separated by the presence of conspicuous, appendiculate veil remnants on the pileus margin and the basidiospores ovoid in face view.


Description author: Excited delirium [EXD]▼ (Request Authorship Credit)