Hortiboletus rubellus

Formerly known as Xerocomus rubellus, notable for the intense reddish color of its pileus.

Pileipellis composed of densely compacted, interwoven filamentous hyphae, 6-12 µm wide, with abundant reddish-brown intracellular pigment and surface incrustations, with emergent terminal elements with rounded apices, septate and clampless (simple septa).

Cystidia scattered, cylindrical to lageniform, up to 60 µm long and 8-9 µm wide.

Basidia clavate, 35-45 µm long and 10-13 µm wide, without basal clamps, 4-spored.

Spores cylindrical to fusiform, smooth- and thick-walled, yellow under the microscope, with a prominent lateral apiculus at one end and internal guttules of variable size.