Spores are spherical, hyaline (translucent), and measure 2.5–3.4 μm in diameter. They are thick-walled with a short pedicel (a tubelike extension), and are ornamented with tiny spines (verrucae) that are roughly equidistant from each other. Capillitial threads are long, hyaline, and branched, measuring 2.4–4 μm thick. They are septate and occasionally have pits on their walls. The exoperidium comprises thick-walled, inflated hyphae mixed with sphaerocysts (spherical cells), while the endoperidium is made of tightly interwoven, thick-walled hyphae. In the rhizomorphs, the hyphae in the central core are several times as thick as those in the surrounding subcortex.