Tricholomopsis ornaticeps

The fruit bodies (basidiocarps) of T. ornaticeps have caps (pilei) which reach 7–8 centimetres (2.8–3.1 inches) in diameter. They are ochraceous to saffron-yellow in colour, and densely covered with minute brown fibrillose scales. They are convex with a downward-curved margin, becoming centrally depressed with age. The lamella (gills) are yellow and they stain brown at the edges. They are moderately distant and sinuate. The stipe measures 3 × 1 cm in length and width. It is creamy at the apex and ochraceous at the base, with a fibrillose to striate surface. The spore print is white. The spores are oval to nearly cylindrical in shape, thin-walled, and measure 8.3 μm × 4.3 μm. The basidia measure 20–40 × 8–10 μm. The hyphae measure about 5 μm in diameter.

Tricholomopsis ornaticeps is native to New Zealand. Its range covers the North and South Islands. Tricholomopsis species are primarily saprotrophic, meaning they obtain nutrients by breaking down organic material. T. ornaticeps has been recorded in Nothofagus forests, as well as in introduced conifer plantations of Pinus radiata and Larix species. T. ornaticeps has been recorded growing on wood from both angiosperms and conifers.