 The spores are ellipsoid, have a central germ pore, and measure 10 – 14 by 5.75 – 8 μm. The basidia (spore-bearing cells) are club-shaped and four-spored. The colorless pleurocystidia (cystidia on the gill face) measure 70 – 140 by 20 – 45 μm, and are roughly elliptical to flask-shaped, while the similarly shaped cheilocystidia (found on the gill edge) measure 50 – 95 by 15 – 25 μm. Clamp connections are present in the hyphae of all tissues of P. auricoma. The cap cuticle comprises a layer of club-shaped, thin-walled cells measuring 25 – 40 by 10 – 30 μm interspersed with long, dark, thick-walled setae. Yellowish-brown setae are plentiful on the cap surface, and consist of an elongated, hair-like segment up to 315 μm long, attached to the surface by a bulbous base that is 3 – 9 μm wide.
