Tricholomopsis rutilans, commonly known as plums and custard, or red-haired agaric, is a species of gilled mushroom found across Europe and North America.

Up to 12 centimetres (4+1⁄2 in) wide[2] with an incurved margin, densely covered with red to purplish red or brick red hairs with maturity the hairs bunching into small scales and the yellowish color beneath showing through Gills: Broadly attached to the stem, yellow, and crowded with many short gills Stem: 5–10 cm (2–4 in) tall, 11–16 mm (7⁄16–5⁄8 in) thick with a red scaly base fading to yellow towards the gills Spores: cream colored, 3–5 x 2.5–5 μm; almost globe shaped to broadly ellipsoid; smooth; clear like glass in KOH Microscopic features: basidia with 4 protrusions, cheilocystidia 50–70+ x 20–25 μm; shaped like a ball on a stick to sack shaped or swollen-irregular, smooth, thin-walled, clear in KOH.

[3] Tricholomopsis rutilans can be found growing on tree stumps and logs (especially those of spruce) in coniferous woodlands throughout the northern hemisphere, in places as diverse as Ireland, Bulgaria, Ukraine and North-West Russia, in late summer and autumn (June until November).

Saprobic on the well-decayed wood of conifers, also occasionally reported in woodchips, sawdust, and lignin-rich soil.

A couple of more recent books list it as of poor quality, reportedly due to a taste of rotting wood.