Hydnellum concrescens

A species with an umbilicate cap and a whitish margin.

Monomitic hyphal system, with filamentous generative hyphae, 2-4 µm wide, interwoven, with brown intracellular pigment and abundant encrusting pigment of the same color on their surface, septate with simple septa (clampless).

Cystidia and other sterile hymenial elements absent.

Basidia cylindric-clavate, 30-35 µm long and 5.5-7 µm wide, without basal clamps, 4-spored.

Spores subglobose to ovoid, with coarse nodulose protuberances, hyaline, containing a large internal oil droplet, inamyloid in Melzer's reagent.