Other option: Giant Funnel (Leucopaxillus giganteus) on account of size. However, frosty funnel more compelling due to wavy margin.

On leaf and needle litter in broadleaf and coniferous forest

Poisonous — suspected of causing the muscarine syndrome; to be avoided in any case because of the risk of confusion

• ▸ Lead-white cap with a matt, frosted (varnished) surface, later with brownish stains
• ▸ Decurrent, whitish to cream gills
• ▸ White, fibrous, spongy stem
• ▸ Grows in groups, often in fairy rings, in litter-rich forest

The commonest of the white, frosted clitocybes — a group that field guides recommend collectors avoid entirely.