The hyphae in the sporocarp are without clamp connections. "H. hyalinus" specifically attaches to the basidiocarp on the sporocarp (fruiting body) of the fungus. Ascospores are borne within sac-like structures called asci, which are contained within the sporocarp. It has a small sporocarp that is 2.6-4.1mm long, 2.4-3.1mm wide, and 1.3-1.7mm thick. The morphology of "Rhizopogon" species is highly cryptic and characters vary greatly throughout sporocarp maturity. Leaflets glaucous, sporocarp ellipsoid, on stalks attached to base of petioles. The sporocarp can be toxic due to high levels of thiaminase, which destroys thiamine.