Tephrocybe or Marasmius?

Tephrocybe or Marasmius?

Observation - Tephrocybe or Marasmius? - UK and Ireland. Description: Pale white/buff mushrooms growing very close to rotten deciduous stump. Flay shiny cap brown/buff in depressed centre, fine radial grooves, almost white nearer serrated margin. White free gills. Grey/brown stem 6 cm long, 2 mm diameter, paler at top, no

Pale white/buff mushrooms growing very close to rotten deciduous stump. Flay shiny cap brown/buff in depressed centre, fine radial grooves, almost white nearer serrated margin. White free gills. Grey/brown stem 6 cm long, 2 mm diameter, paler at top, no ring, small clump at base.. Spore print: cap deliquesced leaving brown deposit, but spores looked to be cream though I couldn't actually find any when I got round to searching under the microscope!