Hi,
Was wondering if this could be
Lyophyllum decastes [I'm aware that may prove an umbrella term for several species]. Was found clumping on grassland in an urban park.
Gills - white, sinuate
Stipe - Fibrous, white/tawny
Pileus - Conical,brownish/grey, darker fibres visible.
Odour - Unremarkable
Apologies for the shot, light was quickly dimming.
cheers, Simon.