Le Naturaliste

Coprinus impatiens (Fr.) Quél.
Features include a small orange-brown to grayish beige pleated cap which dries whitish, gills which deliquesce slowly, a whitish stipe, growth in leaf litter, and black spore deposit. Microscopically there are elliptic spores and abundant cheilocystidia and the cap surface has pileocystidia. CAP 1-4 cm across, ovoid to bluntly conic when young, becoming broadly bell-shaped or convex or remaining bluntly conic, occasionally with small obtuse umbo; hygrophanous, yellowish to dark honey-color, fading as it dries to gray-beige or whitish, becoming gray-brown to sooty in moist condition but fading to whitish; moist, pleated-striate to the disc, disc a translucent zone when fresh and moist; flesh thin, fragile. GILLS deliquescing slowly if at all, ascending adnate but readily seceding, broad, 25-31 reaching stipe; light yellowish at first, becoming blackish brown; edges whitish-fringed. STIPE 2-10 cm x 0.1-0.4 cm, equal or nearly so, hollow, fragile to moderately pliant; pallid dingy yellowish to grayish, becoming whitish when old; surface very slightly pruinose or downy or fibrillose and appearing dull to satiny. HABITAT on foliage or leaf litter, often in small groups of up to twelve. SPORE DEPOSIT black. MICROSTRUCTURES spores 8.5-11 x 5-7 um, elliptic, smooth, distinct apical pore; basidia 4-spored, trimorphic; paraphyses, 18-20 x 10-15 um, inflated, colorless, pleurocystidia none, cheilocystidia abundant, 43-68 x 10-15 um (according to Smith(1949), but Moser (1983) says between 70 and 90 um), colorless, thin-walled, fusoid-ventricose, apices acute; pileocystidia scattered, 40-100 x 9-15 um, fusoid-ventricose, colorless above ventricose part, below with the wall thickened and pale tawny in some, colorless in others; caulocystidia abundant, similar to pileocystidia except that their walls are thin and colorless throughout; clamp connections not seen.

JLouis a écrit : Un scalp devrait confirmer je pense.