Etymology: Dedicated to Dr F . D. Calonge in gratitude for his work and great contribution to the study of Spanish Mycology.
Pileus (0.5-) 0.7-3.5 em diam, convex to plano- convex, with a distinct, central and conical papilla, uniformly yellowish-ochre to straw-ochre, some- times darker at the centre, slightly viscid when moist, not or slightly hygrophanous; margin non striate, incurved to decurved. Lamellae broadly adnate to short decurrent, greyish-violaceous when young to more or less chocolate-brown violaceous at maturity except for the whitish edges. Stipe (2- ) 2.5-6.5 (- 7) x 0.2-0.4 em, cylindrical, straight to flexuous, tough, surface straw-ochre, whitish- ochre at the apex, paler than the pileus, fibrillose with some cortiniform velar remnants at the upper half, hardly discernible in adult specimens, never leaving any trace of ring. Context whitish to concolorous with the surface, non-cyanescent.
Odour and taste absent or weak.
Spores 10.5-13 × 6—7 (- 7. 5) flm, ellipsoid, yellowish- brown, with a more or less thick wall (- 111m)and a broad central germ-pore (about 1.5 flm diam). Basidia 25-35 × 8-10 flm, 4-spored, clavate. Pleurocystidia absent. Cheilocystidia 40-50
x 6-10 × 2-4 flm, lageniform, with a long, cylin- drical neck which may be constricted or sub- capitate. Epicutis formed by a hyaline, more or less gelatinized layer of parallel, narrow, clamped hyphae, 3-5 11m diam, with encrusting pigment. Hypodermium with subsphaerical to broadly cylindrical, clamped hyphae,
15 ( 20) flm diarn with encrusting pigment.
Specimens examined: among Poaceae with Dactylis glomerate ssp. hispanica, in basic soil, Alcala de Henares University (Madrid), 16 Nov. 1983, G. Moreno & J.L. Gonzalez Rojo, 9905; among Poaceae, in acid soil, G. Moreno and F. Esteue-Rauentos.
This species is characterized by a well-marked and acute papilla at the pileus, short decurrent violaceous lamellae, non-cyanescent context and habitat in xerophytic grasslands.
It might be included in section Pratensae Guzman, close to P. pratensis P. D. Orton and P. novae-zelandiae Guzman & Horak. Psilocybe pratensis has a thick viscid pellicle, easily detached from the cap and smaller spores, 9.3-11 (- 12.6) X 6.6-7.7 (-9) x 5.5-7.7 lim, and P. novae – zelandiae has fusoid-ampullaceous and mucronate cheilocystidia and spores 10-11 (- 12) x 6-7 (- 7.5) x 3.5-5.5 ,urn. Species of section Semilanceatae Guzman show a cyanescent context.
- Agarics from xerophytic grasslands in central Spain. Transactions of the British Mycological Society. 90(3):407-413