Flesh turns wine red at edges when cut. Fruiting body 10.2 cm across. Found in mulch under birch. Cracks occur in top of cap where spores were expected to be released. Half buried in soil. First seen 2 weeks ago but only collected yesterday. No reaction to 5% KOH on cap or flesh. Photographed one day after collected, and thus it turned yellow. Initially thought to be white. Basal mycelium white. Smell: fungal (like Agaricus bisporus) when fresh. No smell when one day old. Spores (7) 8 (9) um on average (spores could have been immature). Lightly ornamented (like ‘A’ in mushroomexpert key. Globose.