Irpex lacteus

A species found on various broadleaf wood substrates, forming shell-shaped basidiomes with a hymenophore that starts poroid and becomes irpicoid with age.

Dimitic hyphal system: skeletal hyphae very thick-walled, 3-6 µm wide, generally aseptate with occasional simple septa; generative hyphae thin- to moderately thick-walled, 2-4 µm wide, profusely branched, septate with simple septa.

Cystidia scattered, thick-walled, 50-110 µm long and 6-10 µm wide, projecting up to 40 µm above the basidial level, often heavily encrusted with crystals.

Basidia clavate, arising from a candelabra-like branching base, small, 20-30 µm long and 4-6 µm wide, without basal clamps, 4-spored.

Spores small, ellipsoidal to oblong, smooth, hyaline, thin-walled, with an inconspicuous lateral apiculus at one end, inamyloid in Melzer's reagent.

Herbarium material available: JTP2238/24.