Wortelende champignonparasol

Description:

Description MHCB-17080301: Pileus: 73-86 × 25-28 mm; convex or more or less pulvinate, centre depressed; centre squamulose, increasingly fibrillose with pointy fibrillose scales towards the margin; appendiculate; grey-brown centre, paler outwards. Lamellae: numerous, close, seceding, quite broad, unequal (l: variable); margins equal under 40x magn., slightly brunescent with age; white with brownish sheen; quite some furcation. Stipe: 64-70 × 11-15 mm; central, sometimes slightly compressed, somewhat fusiform or irregularly terete with radicating base; annulus like a tube with a horizontal flaring part, smooth on top, fairly thick margin, pubescent on the underside at the margin, then smooth around the stipe; surface smooth, longitudinally somewhat rugulose; white with browner areas, particularly at apex, grey-brown at base; annulus white with brownish-grey rim underneath. Context: Firm, thick in the pileus, hollow in the stipe with some fine loose hyphae as pith; initially white, but brownish in the stipe and directly underneath the pileipellis after section. Smell/Taste: Mushroomy, musky smell; mild taste. Microscopy: (1000x; oil-im., Melzer’s; 1 sd=1,02 µm; n=20) *Sporae: Frontally ellipsoid to laterally broad amygdaliform; thick-walled, often with single guttule; no germpore. Spav: (6,12) 6,94 (7,65) x (4,59) 4,92 (5,10) µm, Qav: (1,2) 1,4 (1,5).

Habitat:

Ecology: Mesotrophic grassy roadside, calcareous sandy soil, busy area where dogs are walked regularly and where schoolkids and adults litter.

Notes:

Notes: An uncommon and easily recognizable member of the genus Leucoagaricus, at least here in the Netherlands that is. Mainly found in the coastal region on the west and some records from the northern isles, with a single observation inlands. Found them quite en masse on the roadside across the street where I live! Always fun to have such a rarity growing so close. Listed as Vulnerable on our national Red List (Arnolds & Veerkamp, 2008). Distribution in the Netherlands: https://www.verspreidingsatlas.nl/007606... Mushroom Observer: http://mushroomobserver.org/288543?q=8pz...