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Remarks (public):Distribution and ecology: Known from the Patagonian Andes forest of Chile, growing on dead stems of Chusquea quila (Poaceae).
Comments: The new species seems to be a good member of Pteridomyces Jülich, despite the simple-septate hyphae and presence of cystidia. Athelocystis Hjortstam & Ryvarden is somewhat similar by the simple-septate hyphae, pedunculate basidia, and presence of cystidial elements, differing however by the smooth hymenophore, capitate cystidia and pip-shaped basidiospores (Hjortstam and Ryvarden 2010). Morphologically it is close to P. bisporus Boidin & Gilles. The latter species has, however, clamped hyphae, no leptocystidia and larger basidiospores.
 
Description type:Original description 
Description:Basidiomata effused, adnate, membranaceous, whitish, about 50 µm thick, regularly covered with minute, cylindrical aculei, projecting ca 50 µm from hymenial surface, margin thinning out. Hyphal system monomitic, hyphae thin-walled, without clamps; subiculum very thin, forming a network of anastomosing hyphae, 1–2 µm wide; context hyphae intertwined and ordinarily ramified, 2–3 µm wide; subhymenium with densely ramified hyphae, producing a one layered hymenium with densely packed hymenial elements. Bundles of hyphae projecting from the basidiocarp with crystals immersed among straight, scarcely branched hyphae, 2–2.5 µm wide. Leptocystidia abundant, fusoid but apex slightly obtuse, 24–31 — 3–5.5 µm, thin-walled, stalked. No dendrophyses observed. Basidia clavate, stalked, thin-walled, 18–28 — 5.5–6 µm, without basal clamp, with two sterigmata up to 9 um long, attached close to each other at apex of basidia. Basidiospores ovoid to ellipsoid, with a straight adaxial side, 8–9 — 5–5.5 µm, smooth, thin-walled, filled with with oil drops, non-amyloid. 
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