This mushroom found growing on a fallen twig buried in the leaf litter, at Clegg Garden, Nov. 24, 2015. I don't know what it is but I'll start a guess that it is a collyboid fungus, based on the cartilaginous stem and white gills. Possibly
Clitocybula lacerata. I'll revise this post if I get a better determination.
Link to Clitocybula lacerata:
Link to Clitocybula lacerata: