Psilocybe micropora Noordel. & Verduin, Persoonia 17: 257. 1999. -- Kleinporig kaalkopje

beknopte beschrijving:

Hoed 5-17 mm, donker roodbruin, doorschijnend gestreept aan de rand, kaal, niet kleverig, zonder velum. Plaatjes donker roodbruin. Steel 10-30 x 1-2 mm, donker roodbruin, met wat losse vezeltjes.
Sporen klein, 5.5-7.5 x 4.5-6.0 x 4.0-5.5 µm, iets afgeplat, ei- tot mijtervormig in vooraanzicht, betrekkelijk dunwandig, vrijwel zonder kiempore.
Op de grond tussen mos en gras op zandige of venige bodem
Slechts bekend van één plek in Nederland (Wassenaar) en Zweden (Jämtland)

uitgebreide Engelse beschrijving:

macroscopy:

Pileus 5-16 mm, conico-convex soon plano-convex with low umbo, with deflexed then straight margin, hygrophanous, when moist slightly translucently striate at margin only, red brown (Mu. 5 YR 3/2-4/3-4), only slightly paler at margin, pallescent on drying; dry, not viscid; pellicle not peeling. Veil present in form of fine fibrillose-arachnoid covering of marginal zone of pileus and loose fibrils on lower part of stipe. Lamellae, L = 20-26, l= 5-7, moderately distant, broadly adnate rarely somewhat decurrent, triangular then segmentiform, red brown (7.5 YR - 5 YR 4/4), with subentire, concolorous with slightly paler edge. Stipe 10-25 x 1-2 mm, cylindrical to flexuous, often with broadened base, yellow-brown or yellow red at apex, red brown below (7.5 YR 7/6 - 4/4, 5 YR 4/4), with finely pruinose apex , downwards loosely fibrillose. Taste mild. Smell indistinct. Spore print dark blackish-brown.

microscopy:

Spores 5.5-7.5(-8.0) x 4.5-6.0 x 4.0-5.5 µm, ovoid to almost mitriform in frontal view, Q = 1.3-1.6, Qav = 1.4, ellipsoid-oblong to amygdaliform in side-view Q = 1.15-1.5, Qav = 1/4, with slightly thickened, deep brown wall, with very small apical germ pore, often difficult to see. Basidia 15-24 x 6.0-9.0 µm, 4-spored, clamped. Lamella edge sterile. Cheilocystidia 17.5 x 23 x 4.5-6.0 µm, lageniform with slender, 1.5-2.5 µm wide neck, lageniform, thin-walled. Pileipellis a 10-35 µm thick cutis of cylindrical, 2.0-4.0 µm wide hyphae, well differentiated from subpellis composed of very large, inflated elements, 40-95 x 7.0-18 µm, with yellow-brown, membranal and coarsely incrusting pigment, gradually passing into pileitrama. Stipitipellis a cutis of cylindrical hyphae, elements 10-50(-90) x 2.0-6.0 µm wide. Caulocystidia 11-30 x 2.0-6.0, cylindrical to irregularly clavate, at apex of stipe only. Clamp-connections present.

ecology:

Saprotrophic, in groups, terrestrial, on (Rhytidiadelphus squarrosus) and among moss (R. squarrosus and Brachythecium rutabulum) in mossy lawn on sandy-peaty soil.

distribution:

Only known from the type-locality (Wassenaar, Estate Zuidwijck) in the Netherlands and one in Sweden. June.

comment:

Psilocybe micropora is rather similar to Ps. montana, but clearly differs by the rather small spores without or with poorly visible germ pore.