Pseudotomentella nigra

On damp, decaying coniferous wood on the ground, preferentially Pinus or Juniperus (this collection on Pinus pinaster wood), with resupinate basidiomata loosely attached to the substrate, just over 1 mm thick, bluish-grey to dark blue with maturity, with a smooth to faintly pruinose surface.

Subhymenial hyphae filamentous, 2 to 4 µm wide, with abundant right-angled branching, containing brownish intracellular pigment, simple-septate. Subicular hyphae similar, densely encrusted with blue granules that impart the blue colour to the subiculum.

Cystidia absent.

Basidia subcylindrical, ventricose, sinuous, hyaline, 40 to 70 µm long, 8 to 11 µm wide, bearing four stout sterigmata up to 7 µm long (up to 2.5 µm wide at the base).

Spores globose to subglobose, hyaline or with faint pale yellowish pigment, thin-walled and verrucose/echinulate, 7 to 10 µm long, 7 to 8.5 µm wide, containing lipid droplets, inamyloid in Melzer's reagent.