Polyozellus rotundisporus

Known until recently as Pseudotomentella rotundispora, fruiting over the surface of decaying wood on the ground, with completely resupinate basidiomata, bluish to greyish-blue, smooth surface with a velvety texture, and a thin, cottony subiculum.

Subicular hyphae filamentous, moderately thick-walled, containing abundant brown pigment, 4.5 to 5.5 µm wide, profusely branched, septate with simple septa.

Subhymenial hyphae similar but more hyaline and narrower (3.5 to 4.5 µm wide), simple-septate (clampless).

Cystidia absent.

Basidia clavate, 40 to 65 µm long, 6 to 11 µm wide, simple-septate at the base, typically 4-spored with long sterigmata up to 8.5 µm.

Spores spherical, with a verrucose wall, hyaline to pale brown in water under the microscope, 6 to 8.5 µm in diameter, pale greenish-brown in KOH, ornamented with blunt warts 0.7 to 1 µm high.

Herbarium material available: JTP2221/24 and JTP2231/24.