Rubroboletus rubrosanguineus

An uncommon bolete mycorrhizal with firs, with a convex to plano-convex pileus 7 to 15 cm in diameter, vinaceous pink at maturity; reddish pores blueing upon pressure; a cylindrical yellowish stipe with a fine reddish reticulum in the upper portion; hay-like odor and slightly acidic taste.

Cuticle formed by densely interwoven cylindrical hyphae, thin-walled, 4 to 8 µm wide, with copious encrusting ochraceous-brown intracellular pigment, septate with simple septa.

Cystidia fusiform, 45 to 50 µm long, 7 to 9 µm wide, simple-based.

Basidia cylindrical-clavate, 30 to 40 µm long, 7 to 8.5 µm wide, lacking basal clamp connections, predominantly four-spored.

Spores subcylindrical to slightly fusiform, with a pointed, curved end bearing a hyaline apiculus, smooth- and thick-walled, yellowish brown under the microscope, 11 to 15 µm long, 4.5 to 6 µm wide, containing faint oil droplets (guttules) inside.

Herbarium material available: JTP2246/24.